DtsEventHandler.GetExpression(String) 方法

定义

命名空间:

Microsoft.SqlServer.Dts.Runtime

程序集:

Microsoft.SqlServer.ManagedDTS.dll

返回指定属性的表达式。 Null 表示未分配任何表达式。

public:
 virtual System::String ^ GetExpression(System::String ^ propertyName);

public string GetExpression (string propertyName);

abstract member GetExpression : string -> string
override this.GetExpression : string -> string

Public Function GetExpression (propertyName As String) As String

参数

propertyName

String

要查看其表达式的属性的名称。

返回

String

一个字符串，其中包含用于计算属性的表达式。

实现

GetExpression(String)

示例

下面的代码示例创建包并添加包事件的包DtsEventHandlerOnError。 使用此属性 SetExpression时， FailParentOnFailure 将修改该属性。 GetExpression使用该方法时，将显示新值和关联的表达式。

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  

示例输出：

原始 FailParentOnFailure = False

FailParentOnFailure 的新值：True

FailParentOnFailure 的表达式：True