VariableDispenser.LockForRead(String) Método

public:
 void LockForRead(System::String ^ variable);

public void LockForRead (string variable);

member this.LockForRead : string -> unit

Public Sub LockForRead (variable As String)

Parámetros

Ejemplos

En el ejemplo de código siguiente se crea y VariableDispenser se agregan dos variables del sistema a la lista bloqueadas para la lectura y una variable del sistema a la lista bloqueada para escribir. GetVariables A continuación, se llama a para bloquear las tres variables de la colección, y las listas se liberan y están disponibles para las nuevas variables.

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)  
        {  
            Package pkg = new Package();  
            Variables vars = null;  
            VariableDispenser variableDispenser = pkg.VariableDispenser;  
            variableDispenser.LockForRead("System::PackageName");  
            variableDispenser.LockForRead("System::OfflineMode");  
            variableDispenser.GetVariables(ref vars);             
            // Verify that the variable is locked before unlocking.  
            Console.WriteLine("Variables are locked? {0}", vars.Locked);  
            foreach (Variable myVar in vars)  
            {  
                Console.WriteLine("Name        {0}", myVar.Name);  
                Console.WriteLine("Description {0}", myVar.Description);  
                Console.WriteLine();  
            }  
            // Use Contains to determine whether indexing can be used.  
            Boolean pkgName = variableDispenser.Contains("PackageName");  
            String qName = variableDispenser.GetQualifiedName("PackageName");  
            Console.WriteLine("Contains is valid?       {0}", pkgName);  
            Console.WriteLine("Fully qualified name is: {0}", qName);  

            vars.Unlock();  

            Console.WriteLine("Variables are locked? {0}", vars.Locked);  
        }  
    }  
}  

Imports System  
Imports System.Collections.Generic  
Imports System.Text  
Imports Microsoft.SqlServer.Dts.Runtime  

Namespace Microsoft.SqlServer.SSIS.Sample  
    Class Program  
        Shared  Sub Main(ByVal args() As String)  
            Dim pkg As Package =  New Package()   
            Dim vars As Variables =  Nothing   
            Dim variableDispenser As VariableDispenser =  pkg.VariableDispenser   
            variableDispenser.LockForRead("System::PackageName")  
            variableDispenser.LockForRead("System::OfflineMode")  
            variableDispenser.GetVariables( vars)  
            ' Verify that the variable is locked before unlocking.  
            Console.WriteLine("Variables are locked? {0}", vars.Locked)  
            Dim myVar As Variable  
            For Each myVar In vars  
                Console.WriteLine("Name        {0}", myVar.Name)  
                Console.WriteLine("Description {0}", myVar.Description)  
                Console.WriteLine()  
            Next  
            ' Use Contains to determine whether indexing can be used.  
            Dim pkgName As Boolean =  variableDispenser.Contains("PackageName")   
            Dim qName As String =  variableDispenser.GetQualifiedName("PackageName")   
            Console.WriteLine("Contains is valid?       {0}", pkgName)  
            Console.WriteLine("Fully qualified name is: {0}", qName)  

            vars.Unlock()  

            Console.WriteLine("Variables are locked? {0}", vars.Locked)  
        End Sub  
    End Class  
End Namespace  

Salida del ejemplo:

Variables are locked? True

Name OfflineMode

Description The offline mode currently set for the package

Name PackageName

Description The package name

Contains is valid? True

Fully qualified name is: System::PackageName

Variables are locked? False

Comentarios

Este método, en su primera llamada, crea una lista y agrega la variable especificada a la lista. En las llamadas posteriores, las variables se agregan a la lista existente. Este método no bloquea realmente la variable. Cuando haya terminado de crear una lista de las variables que desee, llame GetVariables a para bloquear las variables que se encuentran en esta lista. Cualquier número de llamadas a LockForRead y LockForWrite se puede realizar antes GetVariables de llamar a .

Para borrar un bloqueo correcto cuando haya terminado, llame a Unlock.

Se aplica a