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ForEachEnumeratorHost.SetExpression(String, String) Methode

Definition

Weist der Eigenschaft den angegebenen Ausdruck zu. Geben Sie null an, um einen vorhandenen Ausdruck aus der Eigenschaft zu entfernen.

public:
 virtual void SetExpression(System::String ^ propertyName, System::String ^ expression);
public void SetExpression (string propertyName, string expression);
abstract member SetExpression : string * string -> unit
override this.SetExpression : string * string -> unit
Public Sub SetExpression (propertyName As String, expression As String)

Parameter

propertyName
String

Der Name der Eigenschaft, der der Ausdruck zugewiesen werden soll.

expression
String

Der Ausdruck.

Implementiert

Beispiele

Im folgenden Codebeispiel wird ein SMO-Enumerationsator im ForEachEnumeratorHost. Mithilfe der SetExpression Methode wird die DelayValidation Eigenschaft geändert, und der Ausdruck wird mithilfe der GetExpression Methode abgerufen.

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

namespace Microsoft.SqlServer.SSIS.Sample  
{  
    internal class EnumType  
    {  
        public const string SMOEnum = "Foreach SMO Enumerator";  
    }  
    class SSISProgram  
    {  
        static void Main(string[] args)  
        {  
            Application app = new Application();  
            Package pkg = new Package();  
            ForEachEnumeratorInfos infos = app.ForEachEnumeratorInfos;  
            ForEachEnumeratorInfo info = null;  

            foreach (ForEachEnumeratorInfo enumInfo in infos)  
            {  
                // Uncomment the next line of you want to see all enumerators.  
                //Console.Write("Available enumerators: {0}\n", enumInfo.Name);  
                if (enumInfo.Name == EnumType.SMOEnum)  
                {  
                    // Set the ForEachEnumeratorInfo variable  
                    // to the SMO enumerator, and use it   
                    // later in the CreateNew method.  
                    info = enumInfo;  
                }  
            }  
            ForEachEnumeratorHost enumH = info.CreateNew();  
            Console.WriteLine();  
            // Show the description before it is modified.  
            Console.WriteLine("DelayValidation:  {0}", enumH.DelayValidation);  

            // Modify the Description using SetExpression.  
            //String myExpression = "\"My Description for SMO enumerator\"";  
            String myExpression = "true";  
            enumH.SetExpression("DelayValidation", myExpression);  

            DTSExecResult result = pkg.Validate(null, null, null, null);  

            // Review the new value and expression.  
            String newExpr = enumH.GetExpression("DelayValidation");  
            Console.WriteLine("New DelayValidation: {0}", enumH.DelayValidation);  
            Console.WriteLine("Expression:      {0}", newExpr);  
        }  
    }  
}  
Imports System  
Imports System.Collections.Generic  
Imports System.Text  
Imports Microsoft.SqlServer.Dts.Runtime  

Friend Class EnumType  
    Public Const SMOEnum As String = "Foreach SMO Enumerator"  
End Class 'EnumType  

Class SSISProgram  

    Shared Sub Main(ByVal args() As String)   
        Dim app As New Application()  
        Dim pkg As New Package()  
        Dim infos As ForEachEnumeratorInfos = app.ForEachEnumeratorInfos  
        Dim info As ForEachEnumeratorInfo = Nothing  

        Dim enumInfo As ForEachEnumeratorInfo  
        For Each enumInfo In  infos  
            ' Uncomment the next line of you want to see all enumerators.  
            'Console.Write("Available enumerators: {0}\n", enumInfo.Name);  
            If enumInfo.Name = EnumType.SMOEnum Then  
                ' Set the ForEachEnumeratorInfo variable  
                ' to the SMO enumerator, and use it   
                ' later in the CreateNew method.  
                info = enumInfo  
            End If  
        Next enumInfo  
        Dim enumH As ForEachEnumeratorHost = info.CreateNew()  
        Console.WriteLine()  
        ' Show the description before it is modified.  
        Console.WriteLine("DelayValidation:  {0}", enumH.DelayValidation)  

        ' Modify the Description using SetExpression.  
        'String myExpression = "\"My Description for SMO enumerator\"";  
        Dim myExpression As String = "true"  
        enumH.SetExpression("DelayValidation", myExpression)  

        Dim result As DTSExecResult = pkg.Validate(Nothing, Nothing, Nothing, Nothing)  

        ' Review the new value and expression.  
        Dim newExpr As String = enumH.GetExpression("DelayValidation")  
        Console.WriteLine("New DelayValidation: {0}", enumH.DelayValidation)  
        Console.WriteLine("Expression:      {0}", newExpr)  

    End Sub 'Main  
End Class 'SSISProgram  

Beispielausgabe:

DelayValidation: False

Neue DelayValidation: False

Ausdruck: true

Gilt für: