HostProtectionAttribute.ExternalThreading Property

Definition

Namespace:

System.Security.Permissions

Assembly:

System.Security.Permissions.dll

Gets or sets a value indicating whether external threading is exposed.

public:
 property bool ExternalThreading { bool get(); void set(bool value); };

public bool ExternalThreading { get; set; }

member this.ExternalThreading : bool with get, set

Public Property ExternalThreading As Boolean

Property Value

Boolean

true if external threading is exposed; otherwise, false. The default is false.

Examples

The following code example illustrates the use of the HostProtectionAttribute attribute with the ExternalThreading property. This example is part of a larger example provided for the HostProtectionAttribute class.

// Use the enumeration flags to indicate that this method exposes synchronization 
//  and external threading.

[HostProtection(Synchronization=true,ExternalThreading=true)]
static void StartThread()
{
   Thread^ t = gcnew Thread( gcnew ThreadStart( WatchFileEvents ) );
   
   // Start the new thread.  On a uniprocessor, the thread is not given 
   // any processor time until the main thread yields the processor.  
   t->Start();
   
   // Give the new thread a chance to execute.
   Thread::Sleep( 1000 );
}

// Use the enumeration flags to indicate that this method exposes 
// synchronization and external threading.
[HostProtectionAttribute(Synchronization=true, ExternalThreading=true)]
private static void StartThread()
{
    Thread t = new Thread(new ThreadStart(WatchFileEvents));
    
    // Start the new thread. On a uniprocessor, the thread is not given
    // any processor time until the main thread yields the processor.
    t.Start();
    
    // Give the new thread a chance to execute.
    Thread.Sleep(1000);
}

' Use the enumeration flags to indicate that this method exposes  
' synchronization and external threading.
<HostProtectionAttribute(Synchronization := True, _
    ExternalThreading := True)> _
Private Shared Sub StartThread()
    Dim t As New Thread(New ThreadStart(AddressOf WatchFileEvents))

    ' Start the new thread. On a uniprocessor, the thread is not given 
    ' any processor time until the main thread yields the processor.  
    t.Start()

    ' Give the new thread a chance to execute.
    Thread.Sleep(1000)
End Sub

Remarks

Code that exposes external threading creates or manipulates threads other than its own, which might be harmful to the host.

See also

• ExternalThreading