Package.SetExpression Method

Assigns the specified expression to the property. Specify null to remove an existing expression from the property.

Espace de noms: Microsoft.SqlServer.Dts.Runtime
Assembly: Microsoft.SqlServer.ManagedDTS (in microsoft.sqlserver.manageddts.dll)

Syntaxe

'Déclaration
Public Sub SetExpression ( _
    propertyName As String, _
    expression As String _
)

public void SetExpression (
    string propertyName,
    string expression
)

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

public final void SetExpression (
    String propertyName, 
    String expression
)

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

Paramètres

propertyName
The name of the property to assign the expression to.

expression
The expression.

Notes

The propertyName can be any property available on the object.

Exemple

The following code example modifies the value of the DelayValidation property using SetExpression, then displays the new value using GetExpression.

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

namespace Microsoft.SqlServer.SSIS.Samples
{
    class Program
    {
        static void Main(string[] args)
        {
            Package pkg = new Package();
            // Set an expression on one of the properties.
            DtsProperties pkgProperties = pkg.Properties;

            // View information about the DelayValidation property 
            // before setting it with the SetExpression method.
            Object myValue = pkgProperties["DelayValidation"].GetValue(pkg);
            String mySValue = myValue.ToString();
            Console.WriteLine("value before is {0}", mySValue); 
            
            // Use SetExpression to set the value to true.
            String myTrueString = "true";
            pkgProperties["DelayValidation"].SetExpression(pkg, myTrueString);

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

            // Verify the new setting.
            myValue = pkgProperties["DelayValidation"].GetValue(pkg);
            mySValue = myValue.ToString();

            String myExpression = pkg.Properties["DelayValidation"].GetExpression(pkg);
            String mySExpression = myExpression.ToString();
            Console.WriteLine("The value and expression is {0}, {1}", mySValue, mySExpression);
        }
    }
}

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

Class Program
    Shared Sub Main(ByVal args() As String) 
        Dim pkg As New Package()
        ' Set an expression on one of the properties.
        Dim pkgProperties As DtsProperties = pkg.Properties
        
        ' View information about the DelayValidation property 
        ' before setting it with the SetExpression method.
        Dim myValue As [Object] = pkgProperties("DelayValidation").GetValue(pkg)
        Dim mySValue As String = myValue.ToString()
        Console.WriteLine("value before is {0}", mySValue)
        
        ' Use SetExpression to set the value to true.
        Dim myTrueString As String = "true"
        pkgProperties("DelayValidation").SetExpression(pkg, myTrueString)
        
        ' Validate the package to set the expression onto the property.
        Dim valResult As DTSExecResult = pkg.Validate(Nothing, Nothing, Nothing, Nothing)
        
        ' Verify the new setting.
        myValue = pkgProperties("DelayValidation").GetValue(pkg)
        mySValue = myValue.ToString()
        
        Dim myExpression As String = pkg.Properties("DelayValidation").GetExpression(pkg)
        Dim mySExpression As String = myExpression.ToString()
        Console.WriteLine("The value and expression is {0}, {1}", mySValue, mySExpression)
    End Sub
End Class

Sample Output:

value before is False

The value and expression is True, true

Sécurité des threads

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.

Plateformes

Plateformes de développement

Pour obtenir la liste des plateformes prises en charge, consultez Configuration matérielle et logicielle requise pour l'installation de SQL Server 2005.

Plateformes cibles