String.Equals メソッド

リファレンス

定義

名前空間:: System

アセンブリ:: System.Runtime.dll

アセンブリ:: mscorlib.dll

アセンブリ:: netstandard.dll

重要

一部の情報は、リリース前に大きく変更される可能性があるプレリリースされた製品に関するものです。 Microsoft は、ここに記載されている情報について、明示または黙示を問わず、一切保証しません。

2 つの String オブジェクトの値が同一かどうかを判断します。

オーバーロード

Equals(Object)	このインスタンスと、指定したオブジェクトの値が同一かどうかを判断します。String オブジェクトを指定する必要があります。
Equals(String)	このインスタンスと、指定した別の String の値が同一かどうかを判断します。
Equals(String, String)	指定した 2 つの String オブジェクトの値が同一かどうかを判断します。
Equals(String, StringComparison)	この文字列と、指定した String オブジェクトの値が同一かどうかを判断します。比較に使用するカルチャ、大文字と小文字の区別、および、並べ替え規則をパラメーターで指定します。
Equals(String, String, StringComparison)	指定した 2 つの String オブジェクトの値が同一かどうかを判断します。比較に使用するカルチャ、大文字と小文字の区別、および、並べ替え規則をパラメーターで指定します。

Equals(Object)

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

このインスタンスと、指定したオブジェクトの値が同一かどうかを判断します。String オブジェクトを指定する必要があります。

public:
 override bool Equals(System::Object ^ obj);

public override bool Equals (object obj);

public override bool Equals (object? obj);

override this.Equals : obj -> bool

Public Overrides Function Equals (obj As Object) As Boolean

パラメーター

obj: Object

このインスタンスと比較する文字列。

戻り値

Boolean

true が obj で、このインスタンスと同じ値を保持している場合は String。それ以外の場合は false。 obj が null の場合、メソッドは false を返します。

例

Equalsメソッドの例を次に示します。

// Sample for String::Equals(Object)
//            String::Equals(String)
//            String::Equals(String, String)
using namespace System;
using namespace System::Text;
int main()
{
   StringBuilder^ sb = gcnew StringBuilder( "abcd" );
   String^ str1 = "abcd";
   String^ str2 = nullptr;
   Object^ o2 = nullptr;
   Console::WriteLine();
   Console::WriteLine( " *  The value of String str1 is '{0}'.", str1 );
   Console::WriteLine( " *  The value of StringBuilder sb is '{0}'.", sb );
   Console::WriteLine();
   Console::WriteLine( "1a) String::Equals(Object). Object is a StringBuilder, not a String." );
   Console::WriteLine( "    Is str1 equal to sb?: {0}", str1->Equals( sb ) );
   Console::WriteLine();
   Console::WriteLine( "1b) String::Equals(Object). Object is a String." );
   str2 = sb->ToString();
   o2 = str2;
   Console::WriteLine( " *  The value of Object o2 is '{0}'.", o2 );
   Console::WriteLine( "    Is str1 equal to o2?: {0}", str1->Equals( o2 ) );
   Console::WriteLine();
   Console::WriteLine( " 2) String::Equals(String)" );
   Console::WriteLine( " *  The value of String str2 is '{0}'.", str2 );
   Console::WriteLine( "    Is str1 equal to str2?: {0}", str1->Equals( str2 ) );
   Console::WriteLine();
   Console::WriteLine( " 3) String::Equals(String, String)" );
   Console::WriteLine( "    Is str1 equal to str2?: {0}", String::Equals( str1, str2 ) );
}

/*
This example produces the following results:

 *  The value of String str1 is 'abcd'.
 *  The value of StringBuilder sb is 'abcd'.

1a) String::Equals(Object). Object is a StringBuilder, not a String.
    Is str1 equal to sb?: False

1b) String::Equals(Object). Object is a String.
 *  The value of Object o2 is 'abcd'.
    Is str1 equal to o2?: True

 2) String::Equals(String)
 *  The value of String str2 is 'abcd'.
    Is str1 equal to str2?: True

 3) String::Equals(String, String)
    Is str1 equal to str2?: True
*/

// Sample for String.Equals(Object)
//            String.Equals(String)
//            String.Equals(String, String)
using System;
using System.Text;

class Sample1
{
    public static void Main()
    {
        StringBuilder sb = new StringBuilder("abcd");
        String str1 = "abcd";
        String str2 = null;
        Object o2 = null;

        Console.WriteLine();
        Console.WriteLine(" *  The value of String str1 is '{0}'.", str1);
        Console.WriteLine(" *  The value of StringBuilder sb is '{0}'.", sb.ToString());

        Console.WriteLine();
        Console.WriteLine("1a) String.Equals(Object). Object is a StringBuilder, not a String.");
        Console.WriteLine("    Is str1 equal to sb?: {0}", str1.Equals(sb));

        Console.WriteLine();
        Console.WriteLine("1b) String.Equals(Object). Object is a String.");
        str2 = sb.ToString();
        o2 = str2;
        Console.WriteLine(" *  The value of Object o2 is '{0}'.", o2);
        Console.WriteLine("    Is str1 equal to o2?: {0}", str1.Equals(o2));

        Console.WriteLine();
        Console.WriteLine(" 2) String.Equals(String)");
        Console.WriteLine(" *  The value of String str2 is '{0}'.", str2);
        Console.WriteLine("    Is str1 equal to str2?: {0}", str1.Equals(str2));

        Console.WriteLine();
        Console.WriteLine(" 3) String.Equals(String, String)");
        Console.WriteLine("    Is str1 equal to str2?: {0}", String.Equals(str1, str2));
    }
}
/*
This example produces the following results:

 *  The value of String str1 is 'abcd'.
 *  The value of StringBuilder sb is 'abcd'.

1a) String.Equals(Object). Object is a StringBuilder, not a String.
    Is str1 equal to sb?: False

1b) String.Equals(Object). Object is a String.
 *  The value of Object o2 is 'abcd'.
    Is str1 equal to o2?: True

 2) String.Equals(String)
 *  The value of String str2 is 'abcd'.
    Is str1 equal to str2?: True

 3) String.Equals(String, String)
    Is str1 equal to str2?: True
*/

// Sample for String.Equals(Object)
//            String.Equals(String)
//            String.Equals(String, String)
open System
open System.Text

let sb = StringBuilder "abcd"
let str1 = "abcd"
let str2 = string sb
let o2: obj = str2

printfn $"""
*  The value of String str1 is '{str1}'.
*  The value of StringBuilder sb is '{sb}'.

1a) String.Equals(Object). Object is a StringBuilder, not a String.
Is str1 equal to sb?: {str1.Equals sb}"

1b) String.Equals(Object). Object is a String.
*  The value of Object o2 is '{o2}'.
Is str1 equal to o2?: {str1.Equals o2}

2) String.Equals(String)
*  The value of String str2 is '{str2}'.
Is str1 equal to str2?: {str1.Equals str2}

3) String.Equals(String, String)
Is str1 equal to str2?: {String.Equals(str1, str2)}"""
(*
This example produces the following results:

 *  The value of String str1 is 'abcd'.
 *  The value of StringBuilder sb is 'abcd'.

1a) String.Equals(Object). Object is a StringBuilder, not a String.
    Is str1 equal to sb?: False

1b) String.Equals(Object). Object is a String.
 *  The value of Object o2 is 'abcd'.
    Is str1 equal to o2?: True

 2) String.Equals(String)
 *  The value of String str2 is 'abcd'.
    Is str1 equal to str2?: True

 3) String.Equals(String, String)
    Is str1 equal to str2?: True
*)

' Sample for String.Equals(Object)
'            String.Equals(String)
'            String.Equals(String, String)
Imports System.Text

Class Sample
   Public Shared Sub Main()
      Dim sb As New StringBuilder("abcd")
      Dim str1 As [String] = "abcd"
      Dim str2 As [String] = Nothing
      Dim o2 As [Object] = Nothing
      
      Console.WriteLine()
      Console.WriteLine(" *  The value of String str1 is '{0}'.", str1)
      Console.WriteLine(" *  The value of StringBuilder sb is '{0}'.", sb.ToString())
      
      Console.WriteLine()
      Console.WriteLine("1a) String.Equals(Object). Object is a StringBuilder, not a String.")
      Console.WriteLine("    Is str1 equal to sb?: {0}", str1.Equals(sb))
      
      Console.WriteLine()
      Console.WriteLine("1b) String.Equals(Object). Object is a String.")
      str2 = sb.ToString()
      o2 = str2
      Console.WriteLine(" *  The value of Object o2 is '{0}'.", o2)
      Console.WriteLine("    Is str1 equal to o2?: {0}", str1.Equals(o2))
      
      Console.WriteLine()
      Console.WriteLine(" 2) String.Equals(String)")
      Console.WriteLine(" *  The value of String str2 is '{0}'.", str2)
      Console.WriteLine("    Is str1 equal to str2?: {0}", str1.Equals(str2))
      
      Console.WriteLine()
      Console.WriteLine(" 3) String.Equals(String, String)")
      Console.WriteLine("    Is str1 equal to str2?: {0}", [String].Equals(str1, str2))
   End Sub
End Class
'
'This example produces the following results:
'
' *  The value of String str1 is 'abcd'.
' *  The value of StringBuilder sb is 'abcd'.
'
'1a) String.Equals(Object). Object is a StringBuilder, not a String.
'    Is str1 equal to sb?: False
'
'1b) String.Equals(Object). Object is a String.
' *  The value of Object o2 is 'abcd'.
'    Is str1 equal to o2?: True
'
' 2) String.Equals(String)
' *  The value of String str2 is 'abcd'.
'    Is str1 equal to str2?: True
'
' 3) String.Equals(String, String)
'    Is str1 equal to str2?: True
'

注釈

このメソッドは、序数 (大文字と小文字を区別し、カルチャに依存しない) 比較を実行します。

こちらもご覧ください

適用対象

Equals(String)

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

このインスタンスと、指定した別の String の値が同一かどうかを判断します。

public:
 virtual bool Equals(System::String ^ value);

public:
 bool Equals(System::String ^ value);

public bool Equals (string value);

public bool Equals (string? value);

override this.Equals : string -> bool

Public Function Equals (value As String) As Boolean

パラメーター

value: String

このインスタンスと比較する文字列。

戻り値

Boolean

true パラメーターの値がこのインスタンスの値と同じ場合は value。それ以外の場合は false。 value が null の場合、メソッドは false を返します。

実装

Equals(T)

例

Equalsメソッドの例を次に示します。タイトルの大文字と小文字の単語 "File" と、対応する単語、小文字に相当する単語、大文字に相当する単語、ラテン小文字 I (U+0069) ではなくラテン小文字の DOTLESS I (U+0131) を含む単語を比較します。メソッドは Equals(String) 序数比較を実行するため、同じ単語との比較のみがを返します true。

using System;

public class Example
{
    public static void Main()
    {
        Console.OutputEncoding = System.Text.Encoding.UTF8;
        string word = "File";
        string[] others = { word.ToLower(), word, word.ToUpper(), "Fıle" };
        foreach (string other in others)
        {
            if (word.Equals(other))
                Console.WriteLine("{0} = {1}", word, other);
            else
                Console.WriteLine("{0} {1} {2}", word, '\u2260', other);
        }
    }
}
// The example displays the following output:
//       File ≠ file
//       File = File
//       File ≠ FILE
//       File ≠ Fıle

open System

Console.OutputEncoding <- Text.Encoding.UTF8
let word = "File"
let others = [| word.ToLower(); word; word.ToUpper(); "Fıle" |]
for other in others do
    if word.Equals other then
        printfn $"{word} = {other}"
    else
        printfn $"{word} \u2260 {other}"
// The example displays the following output:
//       File ≠ file
//       File = File
//       File ≠ FILE
//       File ≠ Fıle

Module Example
   Public Sub Main()
      Console.OutputEncoding = System.Text.Encoding.UTF8
      
      Dim word As String = "File"
      Dim others() As String = { word.ToLower(), word, word.ToUpper(), _
                                 "Fıle" }
      For Each other As String In others
         If word.Equals(other) Then 
            Console.WriteLine("{0} = {1}", word, other)
         Else
            Console.WriteLine("{0} {1} {2}", word, ChrW(&H2260), other)
         End If      
      Next        
   End Sub
End Module
' The example displays the following output:
'       File ≠ file
'       File = File
'       File ≠ FILE
'       File ≠ Fıle

注釈

このメソッドは、序数 (大文字と小文字を区別し、カルチャに依存しない) 比較を実行します。

こちらもご覧ください

CompareOrdinal(String, String)

適用対象

Equals(String, String)

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

指定した 2 つの String オブジェクトの値が同一かどうかを判断します。

public:
 static bool Equals(System::String ^ a, System::String ^ b);

public static bool Equals (string a, string b);

public static bool Equals (string? a, string? b);

static member Equals : string * string -> bool

Public Shared Function Equals (a As String, b As String) As Boolean

パラメーター

a: String

比較する最初の文字列または null。

b: String

比較する 2 番目の文字列または null。

戻り値

Boolean

a の値が b の値と同じ場合は true。それ以外の場合は false。 a と b の両方が null の場合、メソッドは true を返します。

例

Equalsメソッドの例を次に示します。

// Sample for String::Equals(Object)
//            String::Equals(String)
//            String::Equals(String, String)
using namespace System;
using namespace System::Text;
int main()
{
   StringBuilder^ sb = gcnew StringBuilder( "abcd" );
   String^ str1 = "abcd";
   String^ str2 = nullptr;
   Object^ o2 = nullptr;
   Console::WriteLine();
   Console::WriteLine( " *  The value of String str1 is '{0}'.", str1 );
   Console::WriteLine( " *  The value of StringBuilder sb is '{0}'.", sb );
   Console::WriteLine();
   Console::WriteLine( "1a) String::Equals(Object). Object is a StringBuilder, not a String." );
   Console::WriteLine( "    Is str1 equal to sb?: {0}", str1->Equals( sb ) );
   Console::WriteLine();
   Console::WriteLine( "1b) String::Equals(Object). Object is a String." );
   str2 = sb->ToString();
   o2 = str2;
   Console::WriteLine( " *  The value of Object o2 is '{0}'.", o2 );
   Console::WriteLine( "    Is str1 equal to o2?: {0}", str1->Equals( o2 ) );
   Console::WriteLine();
   Console::WriteLine( " 2) String::Equals(String)" );
   Console::WriteLine( " *  The value of String str2 is '{0}'.", str2 );
   Console::WriteLine( "    Is str1 equal to str2?: {0}", str1->Equals( str2 ) );
   Console::WriteLine();
   Console::WriteLine( " 3) String::Equals(String, String)" );
   Console::WriteLine( "    Is str1 equal to str2?: {0}", String::Equals( str1, str2 ) );
}

/*
This example produces the following results:

 *  The value of String str1 is 'abcd'.
 *  The value of StringBuilder sb is 'abcd'.

1a) String::Equals(Object). Object is a StringBuilder, not a String.
    Is str1 equal to sb?: False

1b) String::Equals(Object). Object is a String.
 *  The value of Object o2 is 'abcd'.
    Is str1 equal to o2?: True

 2) String::Equals(String)
 *  The value of String str2 is 'abcd'.
    Is str1 equal to str2?: True

 3) String::Equals(String, String)
    Is str1 equal to str2?: True
*/

// Sample for String.Equals(Object)
//            String.Equals(String)
//            String.Equals(String, String)
using System;
using System.Text;

class Sample1
{
    public static void Main()
    {
        StringBuilder sb = new StringBuilder("abcd");
        String str1 = "abcd";
        String str2 = null;
        Object o2 = null;

        Console.WriteLine();
        Console.WriteLine(" *  The value of String str1 is '{0}'.", str1);
        Console.WriteLine(" *  The value of StringBuilder sb is '{0}'.", sb.ToString());

        Console.WriteLine();
        Console.WriteLine("1a) String.Equals(Object). Object is a StringBuilder, not a String.");
        Console.WriteLine("    Is str1 equal to sb?: {0}", str1.Equals(sb));

        Console.WriteLine();
        Console.WriteLine("1b) String.Equals(Object). Object is a String.");
        str2 = sb.ToString();
        o2 = str2;
        Console.WriteLine(" *  The value of Object o2 is '{0}'.", o2);
        Console.WriteLine("    Is str1 equal to o2?: {0}", str1.Equals(o2));

        Console.WriteLine();
        Console.WriteLine(" 2) String.Equals(String)");
        Console.WriteLine(" *  The value of String str2 is '{0}'.", str2);
        Console.WriteLine("    Is str1 equal to str2?: {0}", str1.Equals(str2));

        Console.WriteLine();
        Console.WriteLine(" 3) String.Equals(String, String)");
        Console.WriteLine("    Is str1 equal to str2?: {0}", String.Equals(str1, str2));
    }
}
/*
This example produces the following results:

 *  The value of String str1 is 'abcd'.
 *  The value of StringBuilder sb is 'abcd'.

1a) String.Equals(Object). Object is a StringBuilder, not a String.
    Is str1 equal to sb?: False

1b) String.Equals(Object). Object is a String.
 *  The value of Object o2 is 'abcd'.
    Is str1 equal to o2?: True

 2) String.Equals(String)
 *  The value of String str2 is 'abcd'.
    Is str1 equal to str2?: True

 3) String.Equals(String, String)
    Is str1 equal to str2?: True
*/

// Sample for String.Equals(Object)
//            String.Equals(String)
//            String.Equals(String, String)
open System
open System.Text

let sb = StringBuilder "abcd"
let str1 = "abcd"
let str2 = string sb
let o2: obj = str2

printfn $"""
*  The value of String str1 is '{str1}'.
*  The value of StringBuilder sb is '{sb}'.

1a) String.Equals(Object). Object is a StringBuilder, not a String.
Is str1 equal to sb?: {str1.Equals sb}"

1b) String.Equals(Object). Object is a String.
*  The value of Object o2 is '{o2}'.
Is str1 equal to o2?: {str1.Equals o2}

2) String.Equals(String)
*  The value of String str2 is '{str2}'.
Is str1 equal to str2?: {str1.Equals str2}

3) String.Equals(String, String)
Is str1 equal to str2?: {String.Equals(str1, str2)}"""
(*
This example produces the following results:

 *  The value of String str1 is 'abcd'.
 *  The value of StringBuilder sb is 'abcd'.

1a) String.Equals(Object). Object is a StringBuilder, not a String.
    Is str1 equal to sb?: False

1b) String.Equals(Object). Object is a String.
 *  The value of Object o2 is 'abcd'.
    Is str1 equal to o2?: True

 2) String.Equals(String)
 *  The value of String str2 is 'abcd'.
    Is str1 equal to str2?: True

 3) String.Equals(String, String)
    Is str1 equal to str2?: True
*)

' Sample for String.Equals(Object)
'            String.Equals(String)
'            String.Equals(String, String)
Imports System.Text

Class Sample
   Public Shared Sub Main()
      Dim sb As New StringBuilder("abcd")
      Dim str1 As [String] = "abcd"
      Dim str2 As [String] = Nothing
      Dim o2 As [Object] = Nothing
      
      Console.WriteLine()
      Console.WriteLine(" *  The value of String str1 is '{0}'.", str1)
      Console.WriteLine(" *  The value of StringBuilder sb is '{0}'.", sb.ToString())
      
      Console.WriteLine()
      Console.WriteLine("1a) String.Equals(Object). Object is a StringBuilder, not a String.")
      Console.WriteLine("    Is str1 equal to sb?: {0}", str1.Equals(sb))
      
      Console.WriteLine()
      Console.WriteLine("1b) String.Equals(Object). Object is a String.")
      str2 = sb.ToString()
      o2 = str2
      Console.WriteLine(" *  The value of Object o2 is '{0}'.", o2)
      Console.WriteLine("    Is str1 equal to o2?: {0}", str1.Equals(o2))
      
      Console.WriteLine()
      Console.WriteLine(" 2) String.Equals(String)")
      Console.WriteLine(" *  The value of String str2 is '{0}'.", str2)
      Console.WriteLine("    Is str1 equal to str2?: {0}", str1.Equals(str2))
      
      Console.WriteLine()
      Console.WriteLine(" 3) String.Equals(String, String)")
      Console.WriteLine("    Is str1 equal to str2?: {0}", [String].Equals(str1, str2))
   End Sub
End Class
'
'This example produces the following results:
'
' *  The value of String str1 is 'abcd'.
' *  The value of StringBuilder sb is 'abcd'.
'
'1a) String.Equals(Object). Object is a StringBuilder, not a String.
'    Is str1 equal to sb?: False
'
'1b) String.Equals(Object). Object is a String.
' *  The value of Object o2 is 'abcd'.
'    Is str1 equal to o2?: True
'
' 2) String.Equals(String)
' *  The value of String str2 is 'abcd'.
'    Is str1 equal to str2?: True
'
' 3) String.Equals(String, String)
'    Is str1 equal to str2?: True
'

注釈

このメソッドは、序数 (大文字と小文字を区別し、カルチャに依存しない) 比較を実行します。

こちらもご覧ください

CompareOrdinal(String, String)

適用対象

Equals(String, StringComparison)

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

この文字列と、指定した String オブジェクトの値が同一かどうかを判断します。比較に使用するカルチャ、大文字と小文字の区別、および、並べ替え規則をパラメーターで指定します。

public:
 bool Equals(System::String ^ value, StringComparison comparisonType);

public bool Equals (string value, StringComparison comparisonType);

public bool Equals (string? value, StringComparison comparisonType);

override this.Equals : string * StringComparison -> bool

Public Function Equals (value As String, comparisonType As StringComparison) As Boolean

パラメーター

value: String

このインスタンスと比較する文字列。

comparisonType: StringComparison

文字列の比較方法を指定する列挙値の 1 つ。

戻り値

Boolean

true パラメーターの値がこの文字列と同じ場合は value。それ以外の場合は false。

例外

ArgumentException

comparisonType が StringComparison 値ではありません。

例

次の例では、大文字の "I"、小文字の "i"、ドットなしの "ı" で構成される文字列配列を作成します。次に、メソッドを Equals(String, StringComparison) 呼び出して、可能な StringComparison 列挙値を使用して比較します。

using System;

class Sample 
{
   public static void Main() 
   {
      // Define a string array with the following three "I" characters:
      //      U+0069, U+0131, and U+0049.  
      string[] threeIs = { "i", "ı", "I" };
      // Define Type object representing StringComparison type.
      Type scType = typeof(StringComparison);  
      
      // Show the current culture (for culture-sensitive string comparisons).
      Console.WriteLine("The current culture is {0}.\n", 
                        System.Globalization.CultureInfo.CurrentCulture.Name);
        
      // Perform comparisons using each StringComparison member. 
      foreach (string scName in Enum.GetNames(scType))
      {
         StringComparison sc = (StringComparison) Enum.Parse(scType, scName);
         Console.WriteLine("Comparisons using {0}:", sc);
         // Compare each character in character array.
         for (int ctr = 0; ctr <= 1; ctr++)
         {
            string instanceChar = threeIs[ctr];
            for (int innerCtr = ctr + 1; innerCtr <= threeIs.GetUpperBound(0); innerCtr++)
            {
               string otherChar = threeIs[innerCtr];
               Console.WriteLine("{0} (U+{1}) = {2} (U+{3}): {4}", 
                                 instanceChar, Convert.ToInt16(Char.Parse(instanceChar)).ToString("X4"), 
                                 otherChar, Convert.ToInt16(Char.Parse(otherChar)).ToString("X4"), 
                                 instanceChar.Equals(otherChar, sc));
            }
            Console.WriteLine();
         }
      }   
   }
}
// The example displays the following output:
//       The current culture is en-US.
//       
//       Comparisons using CurrentCulture:
//       i (U+0069) = ı (U+0131): False
//       i (U+0069) = I (U+0049): False
//       
//       ı (U+0131) = I (U+0049): False
//       
//       Comparisons using CurrentCultureIgnoreCase:
//       i (U+0069) = ı (U+0131): False
//       i (U+0069) = I (U+0049): True
//       
//       ı (U+0131) = I (U+0049): False
//       
//       Comparisons using InvariantCulture:
//       i (U+0069) = ı (U+0131): False
//       i (U+0069) = I (U+0049): False
//       
//       ı (U+0131) = I (U+0049): False
//       
//       Comparisons using InvariantCultureIgnoreCase:
//       i (U+0069) = ı (U+0131): False
//       i (U+0069) = I (U+0049): True
//       
//       ı (U+0131) = I (U+0049): False
//       
//       Comparisons using Ordinal:
//       i (U+0069) = ı (U+0131): False
//       i (U+0069) = I (U+0049): False
//       
//       ı (U+0131) = I (U+0049): False
//       
//       Comparisons using OrdinalIgnoreCase:
//       i (U+0069) = ı (U+0131): False
//       i (U+0069) = I (U+0049): True
//       
//       ı (U+0131) = I (U+0049): False

open System
open System.Globalization

// Define a string array with the following three "I" characters:
//      U+0069, U+0131, and U+0049.  
let threeIs = [| "i"; "ı"; "I" |]
// Define Type object representing StringComparison type.
let scType = typeof<StringComparison>  

// Show the current culture (for culture-sensitive string comparisons).
printfn $"The current culture is {CultureInfo.CurrentCulture.Name}.\n"

// Perform comparisons using each StringComparison member. 
for scName in Enum.GetNames scType do
    let sc = Enum.Parse(scType, scName) :?> StringComparison
    printfn $"Comparisons using {sc}:"
    // Compare each character in character array.
    for ctr = 0 to 1 do
        let instanceChar = threeIs[ctr]
        for innerCtr = ctr + 1 to threeIs.GetUpperBound 0 do
            let otherChar = threeIs[innerCtr]
            printfn $"{instanceChar} (U+{Convert.ToInt16(Char.Parse instanceChar):X4}) = {otherChar} (U+{Convert.ToInt16(Char.Parse otherChar):X4}): {instanceChar.Equals(otherChar, sc)}"
        printfn ""
// The example displays the following output:
//       The current culture is en-US.
//       
//       Comparisons using CurrentCulture:
//       i (U+0069) = i (U+0131): False
//       i (U+0069) = I (U+0049): False
//       
//       i (U+0131) = I (U+0049): False
//       
//       Comparisons using CurrentCultureIgnoreCase:
//       i (U+0069) = i (U+0131): False
//       i (U+0069) = I (U+0049): True
//       
//       i (U+0131) = I (U+0049): False
//       
//       Comparisons using InvariantCulture:
//       i (U+0069) = i (U+0131): False
//       i (U+0069) = I (U+0049): False
//       
//       i (U+0131) = I (U+0049): False
//       
//       Comparisons using InvariantCultureIgnoreCase:
//       i (U+0069) = i (U+0131): False
//       i (U+0069) = I (U+0049): True
//       
//       i (U+0131) = I (U+0049): False
//       
//       Comparisons using Ordinal:
//       i (U+0069) = i (U+0131): False
//       i (U+0069) = I (U+0049): False
//       
//       i (U+0131) = I (U+0049): False
//       
//       Comparisons using OrdinalIgnoreCase:
//       i (U+0069) = i (U+0131): False
//       i (U+0069) = I (U+0049): True
//       
//       i (U+0131) = I (U+0049): False

Class Sample
   Public Shared Sub Main() 
      ' Define a string array with the following three "I" characters:
      '      U+0069, U+0131, and U+0049.  
      Dim threeIs() As String = { "i", "ı", "I" }
      ' Define Type object representing StringComparison type.
      Dim scType As Type = GetType(StringComparison)  
      
      ' Show the current culture (for culture-sensitive string comparisons).
      Console.WriteLine("The current culture is {0}." & vbCrLf, _
                        System.Globalization.CultureInfo.CurrentCulture.Name)
        
      ' Perform comparisons using each StringComparison member. 
      For Each scName As String In [Enum].GetNames(scType)
         Dim sc As StringComparison = [Enum].Parse(scType, scName)
         Console.WriteLine("Comparisons using {0}:", sc)
         ' Compare each character in character array.
         For ctr As Integer = 0 To 1
            Dim instanceChar As String = threeIs(ctr)
            For innerCtr As Integer = ctr + 1 To threeIs.GetUpperBound(0)
               Dim otherChar As STring = threeIs(innerCtr)
               Console.WriteLine("{0} (U+{1}) = {2} (U+{3}): {4}", _
                                 instanceChar, Convert.ToInt16(Char.Parse(instanceChar)).ToString("X4"), _
                                 otherChar, Convert.ToInt16(Char.Parse(otherChar)).ToString("X4"), _
                                 instanceChar.Equals(otherChar, sc))
            Next
            Console.WriteLine()
         Next
      Next              
   End Sub
End Class
' The example displays the following output:
'       The current culture is en-US.
'       
'       Comparisons using CurrentCulture:
'       i (U+0069) = i (U+0131): False
'       i (U+0069) = I (U+0049): False
'       
'       i (U+0131) = I (U+0049): False
'       
'       Comparisons using CurrentCultureIgnoreCase:
'       i (U+0069) = i (U+0131): False
'       i (U+0069) = I (U+0049): True
'       
'       i (U+0131) = I (U+0049): False
'       
'       Comparisons using InvariantCulture:
'       i (U+0069) = i (U+0131): False
'       i (U+0069) = I (U+0049): False
'       
'       i (U+0131) = I (U+0049): False
'       
'       Comparisons using InvariantCultureIgnoreCase:
'       i (U+0069) = i (U+0131): False
'       i (U+0069) = I (U+0049): True
'       
'       i (U+0131) = I (U+0049): False
'       
'       Comparisons using Ordinal:
'       i (U+0069) = i (U+0131): False
'       i (U+0069) = I (U+0049): False
'       
'       i (U+0131) = I (U+0049): False
'       
'       Comparisons using OrdinalIgnoreCase:
'       i (U+0069) = i (U+0131): False
'       i (U+0069) = I (U+0049): True
'       
'       i (U+0131) = I (U+0049): False

注釈

パラメーターは comparisonType 、比較で現在のカルチャまたはインバリアントカルチャを使用するか、比較対象の 2 つの文字列の大文字と小文字を区別するか無視するか、単語または序数の並べ替えルールを使用するかを示します。

こちらもご覧ください

CompareOrdinal(String, String)

適用対象

Equals(String, String, StringComparison)

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

ソース:: String.Comparison.cs

指定した 2 つの String オブジェクトの値が同一かどうかを判断します。比較に使用するカルチャ、大文字と小文字の区別、および、並べ替え規則をパラメーターで指定します。

public:
 static bool Equals(System::String ^ a, System::String ^ b, StringComparison comparisonType);

public static bool Equals (string a, string b, StringComparison comparisonType);

public static bool Equals (string? a, string? b, StringComparison comparisonType);

static member Equals : string * string * StringComparison -> bool

Public Shared Function Equals (a As String, b As String, comparisonType As StringComparison) As Boolean

パラメーター

a: String

比較する最初の文字列または null。

b: String

比較する 2 番目の文字列または null。

comparisonType: StringComparison

比較の規則を指定する列挙値の 1 つ。

戻り値

Boolean

true パラメーターの値が a パラメーターの値に等しい場合は b。それ以外の場合は false。

例外

ArgumentException

comparisonType が StringComparison 値ではありません。

例

次の例では、列挙体の各メンバーを使用して、3 つの文字列セットを StringComparison 比較します。比較では、英語 (米国)、タイ語 (タイ)、トルコ語 (トルコ) の文化の規則が使用されます。文字列 "a" と "a-" は "th-TH" カルチャでは同等と見なされますが、他のカルチャでは同じと見なされますが、"i" と "İ" は大文字と小文字が無視されますが、他のカルチャでは "tr-TR" カルチャでは同等と見なされることに注意してください。

using System;
using System.Globalization;
using System.Threading;

public class Example3
{
    public static void Main()
    {
        String[] cultureNames = { "en-US", "th-TH", "tr-TR" };
        String[] strings1 = { "a", "i", "case", };
        String[] strings2 = { "a-", "\u0130", "Case" };
        StringComparison[] comparisons = (StringComparison[])Enum.GetValues(typeof(StringComparison));

        foreach (var cultureName in cultureNames)
        {
            Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(cultureName);
            Console.WriteLine("Current Culture: {0}", CultureInfo.CurrentCulture.Name);
            for (int ctr = 0; ctr <= strings1.GetUpperBound(0); ctr++)
            {
                foreach (var comparison in comparisons)
                    Console.WriteLine("   {0} = {1} ({2}): {3}", strings1[ctr],
                                      strings2[ctr], comparison,
                                      String.Equals(strings1[ctr], strings2[ctr], comparison));

                Console.WriteLine();
            }
            Console.WriteLine();
        }
    }
}
// The example displays the following output:
//    Current Culture: en-US
//       a = a- (CurrentCulture): False
//       a = a- (CurrentCultureIgnoreCase): False
//       a = a- (InvariantCulture): False
//       a = a- (InvariantCultureIgnoreCase): False
//       a = a- (Ordinal): False
//       a = a- (OrdinalIgnoreCase): False
//
//       i = İ (CurrentCulture): False
//       i = İ (CurrentCultureIgnoreCase): False
//       i = İ (InvariantCulture): False
//       i = İ (InvariantCultureIgnoreCase): False
//       i = İ (Ordinal): False
//       i = İ (OrdinalIgnoreCase): False
//
//       case = Case (CurrentCulture): False
//       case = Case (CurrentCultureIgnoreCase): True
//       case = Case (InvariantCulture): False
//       case = Case (InvariantCultureIgnoreCase): True
//       case = Case (Ordinal): False
//       case = Case (OrdinalIgnoreCase): True
//
//
//    Current Culture: th-TH
//       a = a- (CurrentCulture): True
//       a = a- (CurrentCultureIgnoreCase): True
//       a = a- (InvariantCulture): False
//       a = a- (InvariantCultureIgnoreCase): False
//       a = a- (Ordinal): False
//       a = a- (OrdinalIgnoreCase): False
//
//       i = İ (CurrentCulture): False
//       i = İ (CurrentCultureIgnoreCase): False
//       i = İ (InvariantCulture): False
//       i = İ (InvariantCultureIgnoreCase): False
//       i = İ (Ordinal): False
//       i = İ (OrdinalIgnoreCase): False
//
//       case = Case (CurrentCulture): False
//       case = Case (CurrentCultureIgnoreCase): True
//       case = Case (InvariantCulture): False
//       case = Case (InvariantCultureIgnoreCase): True
//       case = Case (Ordinal): False
//       case = Case (OrdinalIgnoreCase): True
//
//
//    Current Culture: tr-TR
//       a = a- (CurrentCulture): False
//       a = a- (CurrentCultureIgnoreCase): False
//       a = a- (InvariantCulture): False
//       a = a- (InvariantCultureIgnoreCase): False
//       a = a- (Ordinal): False
//       a = a- (OrdinalIgnoreCase): False
//
//       i = İ (CurrentCulture): False
//       i = İ (CurrentCultureIgnoreCase): True
//       i = İ (InvariantCulture): False
//       i = İ (InvariantCultureIgnoreCase): False
//       i = İ (Ordinal): False
//       i = İ (OrdinalIgnoreCase): False
//
//       case = Case (CurrentCulture): False
//       case = Case (CurrentCultureIgnoreCase): True
//       case = Case (InvariantCulture): False
//       case = Case (InvariantCultureIgnoreCase): True
//       case = Case (Ordinal): False
//       case = Case (OrdinalIgnoreCase): True

open System
open System.Globalization
open System.Threading

let cultureNames = 
    [| "en-US"; "se-SE" |]
let strings1 = 
    [| "case"; "encyclopædia" 
       "encyclopædia"; "Archæology" |]
let strings2 = 
    [| "Case"; "encyclopaedia" 
       "encyclopedia"; "ARCHÆOLOGY" |]
let comparisons = 
    Enum.GetValues typeof<StringComparison> :?> StringComparison[]

for cultureName in cultureNames do
    Thread.CurrentThread.CurrentCulture <- CultureInfo.CreateSpecificCulture cultureName
    printfn $"Current Culture: {CultureInfo.CurrentCulture.Name}"
    for i = 0 to strings1.GetUpperBound 0 do
        for comparison in comparisons do
            printfn $"   {strings1[i]} = {strings2[i]} ({comparison}): {String.Equals(strings1[i], strings2[i], comparison)}"
        printfn ""         
    printfn ""
// The example displays the following output:
//    Current Culture: en-US
//       case = Case (CurrentCulture): False
//       case = Case (CurrentCultureIgnoreCase): True
//       case = Case (InvariantCulture): False
//       case = Case (InvariantCultureIgnoreCase): True
//       case = Case (Ordinal): False
//       case = Case (OrdinalIgnoreCase): True
//    
//       encyclopædia = encyclopaedia (CurrentCulture): True
//       encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): True
//       encyclopædia = encyclopaedia (InvariantCulture): True
//       encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True
//       encyclopædia = encyclopaedia (Ordinal): False
//       encyclopædia = encyclopaedia (OrdinalIgnoreCase): False
//    
//       encyclopædia = encyclopedia (CurrentCulture): False
//       encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False
//       encyclopædia = encyclopedia (InvariantCulture): False
//       encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False
//       encyclopædia = encyclopedia (Ordinal): False
//       encyclopædia = encyclopedia (OrdinalIgnoreCase): False
//    
//       Archæology = ARCHÆOLOGY (CurrentCulture): False
//       Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True
//       Archæology = ARCHÆOLOGY (InvariantCulture): False
//       Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True
//       Archæology = ARCHÆOLOGY (Ordinal): False
//       Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True
//    
//    
//    Current Culture: se-SE
//       case = Case (CurrentCulture): False
//       case = Case (CurrentCultureIgnoreCase): True
//       case = Case (InvariantCulture): False
//       case = Case (InvariantCultureIgnoreCase): True
//       case = Case (Ordinal): False
//       case = Case (OrdinalIgnoreCase): True
//    
//       encyclopædia = encyclopaedia (CurrentCulture): False
//       encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): False
//       encyclopædia = encyclopaedia (InvariantCulture): True
//       encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True
//       encyclopædia = encyclopaedia (Ordinal): False
//       encyclopædia = encyclopaedia (OrdinalIgnoreCase): False
//    
//       encyclopædia = encyclopedia (CurrentCulture): False
//       encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False
//       encyclopædia = encyclopedia (InvariantCulture): False
//       encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False
//       encyclopædia = encyclopedia (Ordinal): False
//       encyclopædia = encyclopedia (OrdinalIgnoreCase): False
//    
//       Archæology = ARCHÆOLOGY (CurrentCulture): False
//       Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True
//       Archæology = ARCHÆOLOGY (InvariantCulture): False
//       Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True
//       Archæology = ARCHÆOLOGY (Ordinal): False
//       Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True

Imports System.Globalization
Imports System.Threading

Module Example
   Public Sub Main()
      Dim cultureNames() As String = { "en-US", "se-SE" }
      Dim strings1() As String = { "case",  "encyclopædia",  
                                   "encyclopædia", "Archæology" }
      Dim strings2() As String = { "Case", "encyclopaedia", 
                                   "encyclopedia" , "ARCHÆOLOGY" }
      Dim comparisons() As StringComparison = CType([Enum].GetValues(GetType(StringComparison)),
                                           StringComparison())
      
      For Each cultureName In cultureNames
         Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(cultureName)
         Console.WriteLine("Current Culture: {0}", CultureInfo.CurrentCulture.Name)
         For ctr As Integer = 0 To strings1.GetUpperBound(0)
            For Each comparison In comparisons
               Console.WriteLine("   {0} = {1} ({2}): {3}", strings1(ctr),
                                 strings2(ctr), comparison, 
                                 String.Equals(strings1(ctr), strings2(ctr), comparison))
            Next
            Console.WriteLine()         
         Next
         Console.WriteLine()
      Next
   End Sub
End Module
' The example displays the following output:
'    Current Culture: en-US
'       case = Case (CurrentCulture): False
'       case = Case (CurrentCultureIgnoreCase): True
'       case = Case (InvariantCulture): False
'       case = Case (InvariantCultureIgnoreCase): True
'       case = Case (Ordinal): False
'       case = Case (OrdinalIgnoreCase): True
'    
'       encyclopædia = encyclopaedia (CurrentCulture): True
'       encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): True
'       encyclopædia = encyclopaedia (InvariantCulture): True
'       encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True
'       encyclopædia = encyclopaedia (Ordinal): False
'       encyclopædia = encyclopaedia (OrdinalIgnoreCase): False
'    
'       encyclopædia = encyclopedia (CurrentCulture): False
'       encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False
'       encyclopædia = encyclopedia (InvariantCulture): False
'       encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False
'       encyclopædia = encyclopedia (Ordinal): False
'       encyclopædia = encyclopedia (OrdinalIgnoreCase): False
'    
'       Archæology = ARCHÆOLOGY (CurrentCulture): False
'       Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True
'       Archæology = ARCHÆOLOGY (InvariantCulture): False
'       Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True
'       Archæology = ARCHÆOLOGY (Ordinal): False
'       Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True
'    
'    
'    Current Culture: se-SE
'       case = Case (CurrentCulture): False
'       case = Case (CurrentCultureIgnoreCase): True
'       case = Case (InvariantCulture): False
'       case = Case (InvariantCultureIgnoreCase): True
'       case = Case (Ordinal): False
'       case = Case (OrdinalIgnoreCase): True
'    
'       encyclopædia = encyclopaedia (CurrentCulture): False
'       encyclopædia = encyclopaedia (CurrentCultureIgnoreCase): False
'       encyclopædia = encyclopaedia (InvariantCulture): True
'       encyclopædia = encyclopaedia (InvariantCultureIgnoreCase): True
'       encyclopædia = encyclopaedia (Ordinal): False
'       encyclopædia = encyclopaedia (OrdinalIgnoreCase): False
'    
'       encyclopædia = encyclopedia (CurrentCulture): False
'       encyclopædia = encyclopedia (CurrentCultureIgnoreCase): False
'       encyclopædia = encyclopedia (InvariantCulture): False
'       encyclopædia = encyclopedia (InvariantCultureIgnoreCase): False
'       encyclopædia = encyclopedia (Ordinal): False
'       encyclopædia = encyclopedia (OrdinalIgnoreCase): False
'    
'       Archæology = ARCHÆOLOGY (CurrentCulture): False
'       Archæology = ARCHÆOLOGY (CurrentCultureIgnoreCase): True
'       Archæology = ARCHÆOLOGY (InvariantCulture): False
'       Archæology = ARCHÆOLOGY (InvariantCultureIgnoreCase): True
'       Archæology = ARCHÆOLOGY (Ordinal): False
'       Archæology = ARCHÆOLOGY (OrdinalIgnoreCase): True

注釈

こちらもご覧ください

CompareOrdinal(String, String)

適用対象

次の方法で共有

String.Equals メソッド

定義

オーバーロード

Equals(Object)

パラメーター

戻り値

例

注釈

こちらもご覧ください

適用対象

Equals(String)

パラメーター

戻り値

実装

例

注釈

こちらもご覧ください

適用対象

Equals(String, String)

パラメーター

戻り値

例

注釈

こちらもご覧ください

適用対象

Equals(String, StringComparison)

パラメーター

戻り値

例外

例

注釈

こちらもご覧ください

適用対象

Equals(String, String, StringComparison)

パラメーター

戻り値

例外

例

注釈

こちらもご覧ください

適用対象

その他のリソース