Contains メソッド

構文

'宣言
Public Function Contains ( _
    index As Object _
) As Boolean
'使用
Dim instance As DataTypeInfos
Dim index As Object
Dim returnValue As Boolean

returnValue = instance.Contains(index)

public bool Contains(
    Object index
)

public:
bool Contains(
    Object^ index
)

member Contains : 
        index:Object -> bool 

public function Contains(
    index : Object
) : boolean

使用例

次の例では、Contains メソッドを使用して、コレクション内の項目数を調べます。

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;

namespace DBProvInfos_GetEnum_Contains
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create the DataTypeInfos collection.
            DataTypeInfos dataInfos = new Application().DataTypeInfos;

            //Create the enumerator.
            DataTypeInfoEnumerator myEnumerator = dataInfos.GetEnumerator();
            Console.WriteLine("The collection contains the following values:");
            int i = 0;
            DataTypeInfo dtiObject;
            while ((myEnumerator.MoveNext()) && (myEnumerator.Current != null))
            {
                dtiObject = (DataTypeInfo)myEnumerator.Current;
                Console.WriteLine("[{0}] {1} {2}", i++, dtiObject.TypeName, dtiObject.TypeEnumName);
            }
            // Reset puts the index pointer before the beginning.
            // Do not retrieve from the collection until MoveNext is called.
            myEnumerator.Reset();
            myEnumerator.MoveNext();

            // Now that the enumerator has been reset, use Contains.
            //Boolean contains30 = dataInfos.Contains(30);
            Console.WriteLine("contains at least 30 data types? {0}", dataInfos.Contains(30));
            Console.WriteLine("contains at least 20 data types? {0}", dataInfos.Contains(20));
            // Now that the enumerator has been reset, and moved to the
            // first item in the collection, show the first item.
            //dtiObject = (DataTypeInfo)myEnumerator.Current;
            //Console.WriteLine("The first item in the enumerator after Reset:");
            //Console.WriteLine("{0}, {1}", dtiObject.TypeName, dtiObject.TypeEnumName);
            Console.WriteLine();
        }
    }
}

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
 
Namespace DBProvInfos_GetEnum_Contains
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create the DataTypeInfos collection.
            Dim dataInfos As DataTypeInfos =  New Application().DataTypeInfos 
 
            'Create the enumerator.
            Dim myEnumerator As DataTypeInfoEnumerator =  dataInfos.GetEnumerator() 
            Console.WriteLine("The collection contains the following values:")
            Dim i As Integer =  0 
            Dim dtiObject As DataTypeInfo
            While (myEnumerator.MoveNext()) &&(myEnumerator.Current <> Nothing)
                dtiObject = CType(myEnumerator.Current, DataTypeInfo)
                Console.WriteLine("[{0}] {1} {2}",i = Console.WriteLine("[{0}] {1} {2}",i + 1
            End While
            ' Reset puts the index pointer before the beginning.
            ' Do not retrieve from the collection until MoveNext is called.
            myEnumerator.Reset()
            myEnumerator.MoveNext()
 
            ' Now that the enumerator has been reset, use Contains.
            'Boolean contains30 = dataInfos.Contains(30);
            Console.WriteLine("contains at least 30 data types? {0}", dataInfos.Contains(30))
            Console.WriteLine("contains at least 20 data types? {0}", dataInfos.Contains(20))
 
            ' Now that the enumerator has been reset, and moved to the
            ' first item in the collection, show the first item.
            'dtiObject = (DataTypeInfo)myEnumerator.Current;
            'Console.WriteLine("The first item in the enumerator after Reset:");
            'Console.WriteLine("{0}, {1}", dtiObject.TypeName, dtiObject.TypeEnumName);
            Console.WriteLine()
        End Sub
    End Class
End Namespace

サンプルの出力 :

The collection contains the following values:

[0] float DT_R4

[1] double-precision float DT_R8

[2] currency DT_CY

[3] date DT_DATE

[4] Boolean DT_BOOL

[5] decimal DT_DECIMAL

[6] single-byte signed integer DT_I1

[7] single-byte unsigned integer DT_UI1

[8] two-byte signed integer DT_I2

[9] two-byte unsigned integer DT_UI2

[10] four-byte signed integer DT_I4

[11] four-byte unsigned integer DT_UI4

[12] eight-byte signed integer DT_I8

[13] eight-byte unsigned integer DT_UI8

[14] file timestamp DT_FILETIME

[15] unique identifier DT_GUID

[16] byte stream DT_BYTES

[17] string DT_STR

[18] Unicode string DT_WSTR

[19] numeric DT_NUMERIC

[20] database date DT_DBDATE

[21] database time DT_DBTIME

[22] database timestamp DT_DBTIMESTAMP

[23] image DT_IMAGE

[24] text stream DT_TEXT

[25] Unicode text stream DT_NTEXT

contains at least 30 data types?False

contains at least 20 data types?True

関連項目

参照