StringReader クラス

文字列から読み取る TextReader を実装します。

この型のすべてのメンバの一覧については、StringReader メンバ を参照してください。

System.Object
   System.MarshalByRefObject
      System.IO.TextReader
         System.IO.StringReader

<Serializable>
Public Class StringReader   Inherits TextReader
[C#]
[Serializable]
public class StringReader : TextReader
[C++]
[Serializable]
public __gc class StringReader : public TextReader
[JScript]
public
   Serializable
class StringReader extends TextReader

スレッドセーフ

この型の public static (Visual Basicでは Shared) のすべてのメンバは、マルチスレッド操作で安全に使用できます。インスタンスのメンバの場合は、スレッドセーフであるとは限りません。

解説

その他の一般的な I/O タスクまたは関連する I/O タスクの例を次の表に示します。

使用例

[Visual Basic, C#, C++] 次に示すのは、複数のセンテンスを含むテキストから、各センテンスがそれぞれ 2 つのスペースで区切られたパラグラフを作成し、その後そのパラグラフを元のテキストに戻すコード例です。

 
Option Explicit
Option Strict

Imports Microsoft.VisualBasic
Imports System
Imports System.IO

Public Class StrReader

    Shared Sub Main()
    
        Dim textReaderText As String = "TextReader is the " & _
            "abstract base class of StreamReader and " & _
            "StringReader, which read characters from streams " & _
            "and strings, respectively." & _
            vbCrLf & vbCrLf & _
            "Create an instance of TextReader to open a text " & _
            "file for reading a specified range of characters, " & _
            "or to create a reader based on an existing stream." & _
            vbCrLf & vbCrLf & _
            "You can also use an instance of TextReader to read " & _
            "text from a custom backing store using the same " & _
            "APIs you would use for a string or a stream." & _
            vbCrLf & vbCrLf

        Console.WriteLine("Original text:" & vbCrLf & vbCrLf & _
            textReaderText)

        ' From textReaderText, create a continuous paragraph 
        ' with two spaces between each sentence.
        Dim aLine, aParagraph As String
        Dim strReader As New StringReader(textReaderText)
        While True
            aLine = strReader.ReadLine()
            If aLine Is Nothing Then
                aParagraph = aParagraph & vbCrLf
                Exit While
            Else
                aParagraph = aParagraph & aLine & " "
            End If
        End While
        Console.WriteLine("Modified text:" & vbCrLf & vbCrLf & _ 
            aParagraph)
    
        ' Re-create textReaderText from aParagraph.
        Dim intCharacter As Integer 
        Dim convertedCharacter As Char 
        Dim strWriter As New StringWriter()
        strReader = New StringReader(aParagraph)
        While True
            intCharacter = strReader.Read()

            ' Check for the end of the string 
            ' before converting to a character.
            If intCharacter = -1 Then
                Exit While
            End If

            convertedCharacter = Convert.ToChar(intCharacter)
            If convertedCharacter = "."C Then
                strWriter.Write("." & vbCrLf & vbCrLf)

                ' Bypass the spaces between sentences.
                strReader.Read()
                strReader.Read()
            Else
                strWriter.Write(convertedCharacter)
            End If
        End While
        Console.WriteLine(vbCrLf & "Original text:" & vbCrLf & _ 
            vbCrLf & strWriter.ToString())

    End Sub
End Class

[C#] 
using System;
using System.IO;

class StringRW
{
    static void Main()
    {
        string textReaderText = "TextReader is the abstract base " +
            "class of StreamReader and StringReader, which read " +
            "characters from streams and strings, respectively.\n\n" +

            "Create an instance of TextReader to open a text file " +
            "for reading a specified range of characters, or to " +
            "create a reader based on an existing stream.\n\n" +

            "You can also use an instance of TextReader to read " +
            "text from a custom backing store using the same " +
            "APIs you would use for a string or a stream.\n\n";

        Console.WriteLine("Original text:\n\n{0}", textReaderText);

        // From textReaderText, create a continuous paragraph 
        // with two spaces between each sentence.
        string aLine, aParagraph = null;
        StringReader strReader = new StringReader(textReaderText);
        while(true)
        {
            aLine = strReader.ReadLine();
            if(aLine != null)
            {
                aParagraph = aParagraph + aLine + " ";
            }
            else
            {
                aParagraph = aParagraph + "\n";
                break;
            }
        }
        Console.WriteLine("Modified text:\n\n{0}", aParagraph);

        // Re-create textReaderText from aParagraph.
        int intCharacter;
        char convertedCharacter;
        StringWriter strWriter = new StringWriter();
        strReader = new StringReader(aParagraph);
        while(true)
        {
            intCharacter = strReader.Read();

            // Check for the end of the string 
            // before converting to a character.
            if(intCharacter == -1) break;

            convertedCharacter = Convert.ToChar(intCharacter);
            if(convertedCharacter == '.')
            {
                strWriter.Write(".\n\n");

                // Bypass the spaces between sentences.
                strReader.Read();
                strReader.Read();
            }
            else
            {
                strWriter.Write(convertedCharacter);
            }
        }
        Console.WriteLine("\nOriginal text:\n\n{0}", 
            strWriter.ToString());
    }
}

[C++] 
#using <mscorlib.dll>
using namespace System;
using namespace System::IO;

void main()
{
    String* textReaderText = S"TextReader is the abstract base "
        S"class of StreamReader and StringReader, which read "
        S"characters from streams and strings, respectively.\n\n"

        S"Create an instance of TextReader to open a text file "
        S"for reading a specified range of characters, or to "
        S"create a reader based on an existing stream.\n\n"

        S"You can also use an instance of TextReader to read "
        S"text from a custom backing store using the same "
        S"APIs you would use for a string or a stream.\n\n";

    Console::WriteLine("Original text:\n\n{0}", textReaderText);

    // From textReaderText, create a continuous paragraph 
    // with two spaces between each sentence.
    String* aLine, * aParagraph;
    StringReader* strReader  = new StringReader(textReaderText);
    while(true)
    {
        aLine = strReader->ReadLine();
        if(aLine != 0)
        {
            aParagraph = 
                String::Concat(aParagraph, aLine, " ");
        }
        else
        {
            aParagraph = String::Concat(aParagraph, "\n");
            break;
        }
    }
    Console::WriteLine("Modified text:\n\n{0}", aParagraph);

    // Re-create textReaderText from aParagraph.
    int intCharacter;
    Char convertedCharacter;
    StringWriter* strWriter = new StringWriter();
    strReader = new StringReader(aParagraph);
    while(true)
    {
        intCharacter = strReader->Read();

        // Check for the end of the string 
        // before converting to a character.
        if(intCharacter == -1) break;

        convertedCharacter = Convert::ToChar(intCharacter);
        if(convertedCharacter == '.')
        {
            strWriter->Write(".\n\n");

            // Bypass the spaces between sentences.
            strReader->Read();
            strReader->Read();
        }
        else
        {
            strWriter->Write(convertedCharacter);
        }
    }
    Console::WriteLine("\nOriginal text:\n\n{0}", 
        strWriter->ToString());
}

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン をクリックします。

必要条件

名前空間: System.IO

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET

アセンブリ: Mscorlib (Mscorlib.dll 内)

参照

StringReader メンバ | System.IO 名前空間 | TextReader | StringWriter | 入出力操作 | ファイルからのテキストの読み取り | ファイルへのテキストの書き込み