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GetExpression méthode

Returns a String that contains the expression for the specified property. Null means no expression is assigned.

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

Syntaxe

'Déclaration
Public Function GetExpression ( _
    propertyName As String _
) As String
'Utilisation
Dim instance As Package
Dim propertyName As String
Dim returnValue As String

returnValue = instance.GetExpression(propertyName)

public string GetExpression(
    string propertyName
)

public:
virtual String^ GetExpression(
    String^ propertyName
) sealed

abstract GetExpression : 
        propertyName:string -> string 
override GetExpression : 
        propertyName:string -> string 

public final function GetExpression(
    propertyName : String
) : String

Paramètres

Valeur de retour

Type : System. . :: . .String
A String that contains the expression used to evaluate the property.

Implémente

IDTSPropertiesProvider. . :: . .GetExpression(String)

Notes

The propertyName can be any property available on the object.

Exemples

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