DtsProperty.SetExpression メソッド
指定した式をオブジェクトに割り当てます。 既存の式をプロパティから削除するには、nullNULL 参照 (Visual Basic では Nothing) を指定します。
名前空間: Microsoft.SqlServer.Dts.Runtime
アセンブリ: Microsoft.SqlServer.ManagedDTS (Microsoft.SqlServer.ManagedDTS.dll)
構文
'宣言
Public Sub SetExpression ( _
o As Object, _
expression As String _
)
'使用
Dim instance As DtsProperty
Dim o As Object
Dim expression As String
instance.SetExpression(o, expression)
public void SetExpression(
Object o,
string expression
)
public:
void SetExpression(
Object^ o,
String^ expression
)
member SetExpression :
o:Object *
expression:string -> unit
public function SetExpression(
o : Object,
expression : String
)
パラメーター
- o
型: System.Object
式を割り当てるオブジェクトの名前です。
- expression
型: System.String
式です。
説明
すべてのコンテナーといくつかの追加オブジェクトは、GetExpression メソッドおよび SetExpression メソッドを提供するインターフェイスである IDTSPropertiesProvider から継承されます。
使用例
ConnectionManager は、IDTSPropertiesProvider から継承される 1 つのクラスであり、SetExpression メソッドを実装します。 次のコード例では、SetExpression メソッドの使用方法を示します。 この式は、接続マネージャーに固有のプロパティの値を設定します。 接続マネージャーに固有のプロパティは、Properties コレクションに含まれます。
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;
namespace ConnMgr_Properties_Collection
{
class Program
{
static void Main(string[] args)
{
// The package is one of the SSIS Samples.
string mySample = @"C:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Package Samples\CalculatedColumns Sample\CalculatedColumns\CalculatedColumns.dtsx";
// Create an application and load the sample.
Application app = new Application();
Package pkg = app.LoadPackage(mySample, null);
Connections myConns = pkg.Connections;
// Get the Properties collection from the connection manager.
ConnectionManager myConnMgr = myConns[0];
DtsProperties connProperties = myConnMgr.Properties;
// View information about the RetainSameConnection property
// before setting it using the SetExpression method.
Boolean hasProperty = connProperties.Contains("RetainSameConnection");
Console.WriteLine("has RetainSameConnection? {0}", hasProperty);
Object myValue = myConnMgr.Properties["RetainSameConnection"].GetValue(myConnMgr);
String mySValue = myValue.ToString();
Console.WriteLine("value before is {0}", mySValue);String myTrueString = "true";
// Use SetExpression to set the value to true.
myConnMgr.Properties["RetainSameConnection"].SetExpression(myConnMgr, myTrueString);
// Validate the package to set the expression onto the property.
DTSExecResult valResult = pkg.Validate(myConns, null, null, null);
// Now that the value has been set, retrieve it.
myValue = myConnMgr.Properties["RetainSameConnection"].GetValue(myConnMgr);
mySValue = myValue.ToString();
Console.WriteLine("value after is {0}", mySValue);
}
}
}
Imports Microsoft.SqlServer.Dts.Runtime
Namespace ConnMgr_Properties_Collection
Class Program
Shared Sub Main(ByVal args() As String)
' The package is one of the SSIS Samples.
Dim mySample As String = "C:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Package Samples\CalculatedColumns Sample\CalculatedColumns\CalculatedColumns.dtsx"
' Create an application and load the sample.
Dim app As New Application()
Dim pkg As Package = app.LoadPackage(mySample, Nothing)
Dim myConns As Connections = pkg.Connections
' Get the Properties collection from the connection manager.
Dim myConnMgr As ConnectionManager = myConns(0)
Dim connProperties As DtsProperties = myConnMgr.Properties
' View information about the RetainSameConnection property
' before setting it using the SetExpression method.
Dim hasProperty As [Boolean] = connProperties.Contains("RetainSameConnection")
Console.WriteLine("has RetainSameConnection? {0}", hasProperty)
Dim myValue As [Object] = myConnMgr.Properties("RetainSameConnection").GetValue(myConnMgr)
Dim mySValue As String = myValue.ToString()
Console.WriteLine("value before is {0}", mySValue)
Dim myTrueString As String = "true"
' Use SetExpression to set the value to true.
myConnMgr.Properties("RetainSameConnection").SetExpression(myConnMgr, myTrueString)
' Validate the package to set the expression onto the property.
Dim valResult As DTSExecResult = pkg.Validate(myConns, Nothing, Nothing, Nothing)
' Now that the value has been set, retrieve it.
myValue = myConnMgr.Properties("RetainSameConnection").GetValue(myConnMgr)
mySValue = myValue.ToString()
Console.WriteLine("value after is {0}", mySValue)
End Sub
End Class
End Namespace
サンプル出力:
has RetainSameConnection? True
value before is False
value after is True