DataTypeInfos.Contains(Object) メソッド
定義
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。
例外をスローせずにインデックスを使用してコレクション内の項目にアクセスできるかどうかを示すブール値を返します。
public:
bool Contains(System::Object ^ index);public bool Contains (object index);member this.Contains : obj -> boolPublic Function Contains (index As Object) As Booleanパラメーター
- index
- Object
コレクションで検索する項目のインデックスです。
戻り値
コレクションにインデックスでアクセスできるかどうかを示すブール値。 値 true は、DataTypeInfos[index] 構文を使用してコレクションにアクセスできることを示します。 false の値は、インデックス作成を使用してコレクションから項目を取得できないことを DataTypeInfos 示します。
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
には少なくとも 30 個のデータ型が含まれていますか? False
contains at least 20 data types? True