TaskHost.SetExpression(String, String) Metode

Definisi

Ruang nama:

Microsoft.SqlServer.Dts.Runtime

Rakitan:

Microsoft.SqlServer.ManagedDTS.dll

Menetapkan ekspresi yang ditentukan ke properti . Tentukan null untuk menghapus ekspresi yang ada dari properti .

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)

Parameter

propertyName

String

Nama properti untuk menetapkan ekspresi.

expression

String

Ekspresi .

Penerapan

SetExpression(String, String)

Contoh

Contoh kode berikut menunjukkan cara menggunakan SetExpression metode dan GetExpression dari TaskHost. Untuk contoh kode ini, tugas yang dihosting adalah BulkInsertTask.

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

namespace Microsoft.SqlServer.SSIS.Sample  
{  
    class Program  
        {  
        static void Main(string[] args)  
        {  
            Package pkg = new Package();  
            TaskHost th = (TaskHost)pkg.Executables.Add("STOCK:BulkInsertTask");  

            // View information about the CheckConstraints property  
            // before setting it using the SetExpression method.  
            Boolean checkConstraint = (Boolean)th.Properties["CheckConstraints"].GetValue(th);  
            Console.WriteLine("Original value of CheckConstraints: {0}", checkConstraint);  

            // Use SetExpression to set the value to true.  
            String myTrueString = "true";  
            th.Properties["CheckConstraints"].SetExpression(th, myTrueString);  

            // 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.  
            checkConstraint = (Boolean)th.Properties["CheckConstraints"].GetValue(th);  
            String myExpression = th.Properties["CheckConstraints"].GetExpression(th);  
            Console.WriteLine("New value of CheckConstraints: {0}", checkConstraint);  
            Console.WriteLine("Expression for CheckConstraints: {0}", myExpression);  
        }  
    }  
}  

Contoh Output:

Nilai asli CheckConstraints: False

Nilai baru CheckConstraints: True

Ekspresi untuk CheckConstraints: true

Keterangan

propertyName dapat berupa properti apa pun yang tersedia pada objek .