Package.GetExpression(String) Méthode

Définition

Espace de noms:

Microsoft.SqlServer.Dts.Runtime

Assembly:

Microsoft.SqlServer.ManagedDTS.dll

Retourne une valeur qui contient l'expression de la propriété spécifiée. Null signifie qu’aucune expression n’est affectée.

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

Paramètres

propertyName

String

Nom de la propriété dont vous souhaitez afficher l'expression.

Retours

String

Valeur qui contient l'expression utilisée pour évaluer la propriété.

Implémente

GetExpression(String)

Exemples

L’exemple de code suivant modifie la valeur de la DelayValidation propriété à l’aide SetExpressionde , puis affiche la nouvelle valeur à l’aide GetExpressionde .

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  

Exemple de sortie :

value before is False

The value and expression is True, true

Remarques

Il propertyName peut s’agir de n’importe quelle propriété disponible sur l’objet.