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SetExpression méthode

Assigns the specified expression to the property. Specify nullNothingnullptrunitune référence Null (Nothing dans Visual Basic) to remove an existing expression from the property.

Espace de noms :  Microsoft.SqlServer.Dts.Runtime
Assembly :  Microsoft.SqlServer.ManagedDTS (dans Microsoft.SqlServer.ManagedDTS.dll)

Syntaxe

'Déclaration
Public Sub SetExpression ( _
    propertyName As String, _
    expression As String _
)
'Utilisation
Dim instance As TaskHost
Dim propertyName As String
Dim expression As String

instance.SetExpression(propertyName, _
    expression)

public void SetExpression(
    string propertyName,
    string expression
)

public:
virtual void SetExpression(
    String^ propertyName, 
    String^ expression
) sealed

abstract SetExpression : 
        propertyName:string * 
        expression:string -> unit 
override SetExpression : 
        propertyName:string * 
        expression:string -> unit 

public final function SetExpression(
    propertyName : String, 
    expression : String
)

Paramètres

Implémente

IDTSPropertiesProvider. . :: . .SetExpression(String, String)

Notes

The propertyName can be any property available on the object.

Exemples

The following code example shows how to use the SetExpression and GetExpression methods of the TaskHost. For this code example, the hosted task is the BulkInsertTask.

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


namespace Microsoft.SqlServer.SSIS.Sample
{
    class Program
        {
        static void Main(string[] args)
        {
            Package pkg = new Package();
            TaskHost th = (TaskHost)pkg.Executables.Add("STOCK:BulkInsertTask");

            // View information about the CheckConstraints property
            // before setting it using the SetExpression method.
            Boolean checkConstraint = (Boolean)th.Properties["CheckConstraints"].GetValue(th);
            Console.WriteLine("Original value of CheckConstraints: {0}", checkConstraint);

            // Use SetExpression to set the value to true.
            String myTrueString = "true";
            th.Properties["CheckConstraints"].SetExpression(th, myTrueString);

            // 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.
            checkConstraint = (Boolean)th.Properties["CheckConstraints"].GetValue(th);
            String myExpression = th.Properties["CheckConstraints"].GetExpression(th);
            Console.WriteLine("New value of CheckConstraints: {0}", checkConstraint);
            Console.WriteLine("Expression for CheckConstraints: {0}", myExpression);
        }
    }
}

Sample Output:

Original value of CheckConstraints: False

New value of CheckConstraints: True

Expression for CheckConstraints: true