Variables.Locked 屬性
A Boolean indicating whether the variables in the Variables collection are locked.
命名空間： Microsoft.SqlServer.Dts.Runtime
組件： Microsoft.SqlServer.ManagedDTS (在 Microsoft.SqlServer.ManagedDTS.dll 中)
語法
'宣告
Public ReadOnly Property Locked As Boolean
Get
'用途
Dim instance As Variables
Dim value As Boolean
value = instance.Locked
public bool Locked { get; }
public:
property bool Locked {
bool get ();
}
member Locked : bool
function get Locked () : boolean
屬性值
型別：System.Boolean
true indicates that the collection is locked. A value of false indicates that the collection is unlocked.
備註
The Variables collection contains a Locked property that indicates whether a variable dispenser collection of variables is locked (true) or unlocked (false). The reason to review this property is that some tasks explicitly release locks to the variables they are using, and calling Unlock twice throws an error. Therefore, you should use Locked property determine whether the dispensed collection is locked before calling Unlock.
範例
The following code example locks the variable collection when GetVariables is called. The example then determines whether the collection is locked and, if the collection is locked, calls Unlock.
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.LockForWrite("System::InteractiveMode");
variableDispenser.GetVariables(ref vars);
// Determine whether the variable collection is locked before unlocking.
Boolean isLocked = vars.Locked;
// Verify the value of vars.Locked. If the lock failed,
// call Reset.
if (isLocked)
{
vars.Unlock();
}
else
{
variableDispenser.Reset();
}
}
}
}
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.LockForWrite("System::InteractiveMode")
variableDispenser.GetVariables( vars)
' Determine whether the variable collection is locked before unlocking.
Dim isLocked As Boolean = vars.Locked
' Verify the value of vars.Locked. If the lock failed,
' call Reset.
If isLocked = True Then
vars.Unlock()
Else
variableDispenser.Reset()
End If
End Sub
End Class
End Namespace