Sequence.GetExpression Method

Articolo
12/15/2008

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

Spazio dei nomi: Microsoft.SqlServer.Dts.Runtime
Assembly : Microsoft.SqlServer.ManagedDTS (in microsoft.sqlserver.manageddts.dll)

Sintassi

'Dichiarazione
Public Function GetExpression ( _
    propertyName As String _
) As String

public string GetExpression (
    string propertyName
)

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

public final String GetExpression (
    String propertyName
)

public final function GetExpression (
    propertyName : String
) : String

Parametri

propertyName
The name of the property whose expression you want to see.

Valore restituito

A String that contains the expression used to evaluate the property.

Osservazioni

The propertyName can be any property available on the object.

Esempio

The following code example uses SetExpression to modify the value of the Description on a Sequence container. Then GetExpression is used to retrieve the expression.

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

namespace Microsoft.SqlServer.SSIS.Sample
{
    class Program
    {
        static void Main(string[] args)
        {
            const String containerName = "Sequence";
            Package pkg = new Package();
            Sequence sequence = (Sequence)pkg.Executables.Add("STOCK:Sequence");
            DtsProperties seqProps = sequence.Properties;

            // View information about the Description property
            // before setting it using the SetExpression method.
            String desc = sequence.Description;
            Console.WriteLine("Original value of Description: {0}", desc);

            // Use SetExpression to give the Sequence a description.
            String myExpression = "\"Testing " + containerName + "\""; 
            sequence.SetExpression("Description", myExpression);
            // Note that I've tried using the Properties bag instead, with no change to the results.
            //seqProps["Description"].SetExpression(sequence, myExpression); 

            //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.
            String myNewDesc = sequence.Description;
            String myNewExpression = sequence.GetExpression("Description");
            Console.WriteLine("New value of Description: {0}", myNewDesc);
            Console.WriteLine("Expression for Description: {0}", myNewExpression);
        }
    }
}

Sample Output:

Original value of Description:

New value of Description: Testing Sequence

Expression for Description: "Testing Sequence"

Thread Safety

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.

Piattaforme

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Per un elenco delle piattaforme supportate, vedere Requisiti hardware e software per l'Installazione di SQL Server 2005.

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