• Article

Méthode Add

Adds a new container or task object to the Executables collection.

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

Syntaxe

'Déclaration
Public Function Add ( _
    moniker As String _
) As Executable
'Utilisation
Dim instance As Executables
Dim moniker As String
Dim returnValue As Executable

returnValue = instance.Add(moniker)

public Executable Add(
    string moniker
)

public:
Executable^ Add(
    String^ moniker
)

member Add : 
        moniker:string -> Executable 

public function Add(
    moniker : String
) : Executable

Paramètres

Valeur de retour

Type : Microsoft.SqlServer.Dts.Runtime. . :: . .Executable
A TaskHost object from the newly created Executable object.
To set properties or to call methods on the new object, you have two options:

  1. Use the Properties collection of the TaskHost. For example, to get a property from the object, use th.Properties["propertyname"].GetValue(th)). To set a property, use th.Properties["propertyname"].SetValue(th, <value>);.

  2. Cast the InnerObject of the TaskHost to the task class. For example, to cast the Bulk Insert task to a BulkInsertTask after it has been added to a package as an Executable and subsequently cast to a TaskHost, use BulkInsertTask myTask = th.InnerObject as BulkInsertTask;.

Using the TaskHost class in code without casting to the task-specific class has these advantages:

  • The TaskHostProperties provider does not require a reference to the assembly in the code.

  • You can code generic routines that work for any task, because you do not have to know the name of the task at compile time. These generic routines can be methods where you pass in the name of the task to the method, and the method code works for all tasks. This is a good method for writing test code.

Casting from the TaskHost to the task-specific class has the following advantages:

  • The Visual Studio project provides you with statement completion (IntelliSense).

  • The code may run faster.

  • Produces early-bound objects For more information on early and late binding, see Early and Late Binding in Visual Basic Language Concepts.

Depending on your needs, you may or may not cast the object to its task-specific class.

Notes

Use Add when you create a new container or task and want to add it to the Executables collection. The method parameter is a string, which can be the CLSID, PROGID, STOCK moniker, or CreationName property of the TaskInfo object. The method returns the TaskHost object of the newly created task as an Executable object. For more information, see Ajout de tâches à un flux de contrôle.

Exemples

The following code example adds the Bulk Insert task as an executable to the package.

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

namespace Executables_API
{
        class Program
        {
        static void Main(string[] args)
        {
            Package pkg = new Package();
            Executable exec = pkg.Executables.Add("STOCK:BulkInsertTask");

            // Obtain the collection.
            Executables pgkExecs = pkg.Executables;
            foreach (Executable eachExec in pgkExecs)
            {
                TaskHost th = exec as TaskHost;
                Console.WriteLine("Executable creation name is: {0}", th.CreationName);
            }
                        // Show that at least one executable exists.
            if (pgkExecs.Contains(0))
            {
                Console.WriteLine("Contains returned true");
            }
            else
            {
                Console.WriteLine("Contains returned false");
            }
        }
    }
}

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
 
Namespace Executables_API
        Class Program
        Shared  Sub Main(ByVal args() As String)
            Dim pkg As Package =  New Package() 
            Dim exec As Executable =  pkg.Executables.Add("STOCK:BulkInsertTask") 
 
            ' Obtain the collection.
            Dim pgkExecs As Executables =  pkg.Executables 
            Dim eachExec As Executable
            For Each eachExec In pgkExecs
                Dim th As TaskHost =  exec as TaskHost 
                Console.WriteLine("Executable creation name is: {0}", th.CreationName)
            Next
                        ' Show that at least one executable exists.
            If pgkExecs.Contains(0) Then
                Console.WriteLine("Contains returned true")
            Else 
                Console.WriteLine("Contains returned false")
            End If
        End Sub
        End Class
End Namespace

Sample Output:

Executable creation name is: Microsoft.SqlServer.Dts.Tasks.BulkInsertTask.BulkInsertTask, Microsoft.SqlServer.BulkInsertTask, Version=10.0.000.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91

Contains returned true