DtsEventHandler.GetExpression Method

Returns the expression for the specified property. Null means no expression is assigned.

命名空間: Microsoft.SqlServer.Dts.Runtime
組件: Microsoft.SqlServer.ManagedDTS (in microsoft.sqlserver.manageddts.dll)

語法

'宣告
Public Function GetExpression ( _
    propertyName As String _
) As String

public string GetExpression (
    string propertyName
)

public:
virtual String^ GetExpression (
    String^ propertyName
) sealed

public final String GetExpression (
    String propertyName
)

public final function GetExpression (
    propertyName : String
) : String

參數

• propertyName
  The name of the property whose expression you want to see.

傳回值

A String that contains the expression used to evaluate the property.

範例

The following code example creates a package and adds a DtsEventHandler for the package OnError event. Using the SetExpression, the FailParentOnFailure property is modified. Using the GetExpression method, the new value and associated expression are displayed.

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

namespace Microsoft.SqlServer.SSIS.Sample
{
    class SSISProgram
    {
        static void Main(string[] args)
        {
            Package pkg = new Package();
            // Set up a DtsEventHandler for the package OnError event.
            DtsEventHandler dtsEH = (DtsEventHandler)pkg.EventHandlers.Add("OnError");

            // Show the value of DebugMode on the container before modifying it.
            Console.WriteLine("Original FailParentOnFailure = {0}", dtsEH.FailParentOnFailure);

            // Use SetExpression to set DebugMode to "true".
            String myExpression = "True";
            dtsEH.SetExpression("FailParentOnFailure", myExpression);

            //Validate the package to set the expression onto the property.
            DTSExecResult valResult = pkg.Validate(null, null, null, null);

            // Retrieve the new value and the expression.
            String myNewExpression = dtsEH.GetExpression("FailParentOnFailure");
            Console.WriteLine("New value of FailParentOnFailure: {0}", dtsEH.FailParentOnFailure);
            Console.WriteLine("Expression for FailParentOnFailure: {0}", myNewExpression);
        }
    }
}

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime

Class SSISProgram
    
    Shared Sub Main(ByVal args() As String) 
        Dim pkg As New Package()
        ' Set up a DtsEventHandler for the package OnError event.
        Dim dtsEH As DtsEventHandler = CType(pkg.EventHandlers.Add("OnError"), DtsEventHandler)
        
        ' Show the value of DebugMode on the container before modifying it.
        Console.WriteLine("Original FailParentOnFailure = {0}", dtsEH.FailParentOnFailure)
        
        ' Use SetExpression to set DebugMode to "true".
        Dim myExpression As String = "True"
        dtsEH.SetExpression("FailParentOnFailure", myExpression)
        
        'Validate the package to set the expression onto the property.
        Dim valResult As DTSExecResult = pkg.Validate(Nothing, Nothing, Nothing, Nothing)
        
        ' Retrieve the new value and the expression.
        Dim myNewExpression As String = dtsEH.GetExpression("FailParentOnFailure")
        Console.WriteLine("New value of FailParentOnFailure: {0}", dtsEH.FailParentOnFailure)
        Console.WriteLine("Expression for FailParentOnFailure: {0}", myNewExpression)
    
    End Sub 'Main
End Class

Sample Output:

Original FailParentOnFailure = False

New value of FailParentOnFailure: True

Expression for FailParentOnFailure: True

執行緒安全性

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

平台

開發平台

如需受支援的平台清單，請參閱＜安裝 SQL Server 2005 的硬體和軟體需求＞。

目標平台

如需受支援的平台清單，請參閱＜安裝 SQL Server 2005 的硬體和軟體需求＞。

請參閱

參考

DtsEventHandler Class
DtsEventHandler Members
Microsoft.SqlServer.Dts.Runtime Namespace