GetExpression メソッド
指定したプロパティの式を表す String を返します。Null は、式が割り当てられていないことを示します。
名前空間: Microsoft.SqlServer.Dts.Runtime
アセンブリ: Microsoft.SqlServer.ManagedDTS (Microsoft.SqlServer.ManagedDTS.dll)
構文
'宣言
Function GetExpression ( _
propertyName As String _
) As String
'使用
Dim instance As IDTSPropertiesProvider
Dim propertyName As String
Dim returnValue As String
returnValue = instance.GetExpression(propertyName)
string GetExpression(
string propertyName
)
String^ GetExpression(
String^ propertyName
)
abstract GetExpression :
propertyName:string -> string
function GetExpression(
propertyName : String
) : String
パラメーター
- propertyName
型: System. . :: . .String
参照する式のプロパティの名前です。
戻り値
型: System. . :: . .String
プロパティの評価に使用される式を表す String です。
説明
propertyName には、オブジェクトで使用可能な任意のプロパティを指定できます。
使用例
ConnectionManager クラスは、IDTSPropertiesProvider インターフェイスから継承されます。次のコード例では、ConnectionManager クラスが継承した SetExpression メソッドと GetExpression メソッドの使用方法を示しています。
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 on the property.
DTSExecResult valResult = pkg.Validate(myConns, null, null, null);
// Now that the value has been set, retrieve the value
// and the expression.
myValue = myConnMgr.Properties["RetainSameConnection"].GetValue(myConnMgr);
mySValue = myValue.ToString();
String myExpression = myConnMgr.Properties["RetainSameConnection"].GetExpression(myConnMgr);
String mySExpression = myExpression.ToString();
Console.WriteLine("value and expression is {0}, {1}", mySValue, mySExpression);
}
}
}
Imports System
Imports System.Collections.Generic
Imports System.Text
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 on the property.
Dim valResult As DTSExecResult = pkg.Validate(myConns, Nothing, Nothing, Nothing)
' Now that the value has been set, retrieve the value
' and the expression.
myValue = myConnMgr.Properties("RetainSameConnection").GetValue(myConnMgr)
mySValue = myValue.ToString()
Dim myExpression As String = myConnMgr.Properties("RetainSameConnection").GetExpression(myConnMgr)
Dim mySExpression As String = myExpression.ToString()
Console.WriteLine("value and expression is {0}, {1}", mySValue, mySExpression)
End Sub
End Class
End Namespace
サンプルの出力 :
has RetainSameConnection?True
value before is False
value and expression is True, true