Sequence.SetExpression(String, String) 方法

定义

命名空间:

Microsoft.SqlServer.Dts.Runtime

程序集:

Microsoft.SqlServer.ManagedDTS.dll

将指定的表达式分配给属性。 指定 null 以从属性中删除现有表达式。

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

public void SetExpression (string propertyName, string expression);

abstract member SetExpression : string * string -> unit
override this.SetExpression : string * string -> unit

Public Sub SetExpression (propertyName As String, expression As String)

参数

propertyName

String

向其分配表达式的属性的名称。

expression

String

表达式。

实现

SetExpression(String, String)

示例

下面的代码示例用于SetExpression修改容器上的Sequence值Description。 然后 GetExpression 用于检索表达式。

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);  
        }  
    }  
}  

示例输出：

说明的原始值：

说明的新值：测试序列

描述的表达式：“测试序列”

注解

可以是 propertyName 对象上可用的任何属性。