SetExpression 方法

Assigns the specified expression to the property. Specify nullNothingnullptrunitnull 引用(在 Visual Basic 中为 Nothing) to remove an existing expression from the property.

命名空间:  Microsoft.SqlServer.Dts.Runtime
程序集:  Microsoft.SqlServer.ManagedDTS(在 Microsoft.SqlServer.ManagedDTS.dll 中)

语法

声明
Public Sub SetExpression ( _
    propertyName As String, _
    expression As String _
)
用法
Dim instance As Sequence
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
)

参数

实现

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

注释

The propertyName can be any property available on the object.

示例

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"