VerifyAccess Method
Collapse the table of content
Expand the table of content

DispatcherObject.VerifyAccess Method ()

 

Enforces that the calling thread has access to this DispatcherObject.

Namespace:   System.Windows.Threading
Assembly:  WindowsBase (in WindowsBase.dll)

public void VerifyAccess()

Exception Condition
InvalidOperationException

the calling thread does not have access to this DispatcherObject.

Only the thread the Dispatcher was created on may access the DispatcherObject.

Any thread can check to see whether it has access to this DispatcherObject.

The difference between CheckAccess and VerifyAccess is that CheckAccess returns a Boolean that specifies whether the calling thread has access to this DispatcherObject and VerifyAccess throws an exception if the calling thread does not have access to the this DispatcherObject.

The following example uses VerifyAccess to determine whether a thread has access to the thread that a Button was created on. If the calling thread does not have access, an InvalidOperationException is thrown.

// Check if this thread has access to this object.
theButton.VerifyAccess();

// Thread has access to the object, so update the UI.
UpdateButtonUI(theButton);

.NET Framework
Available since 3.0
Return to top
Show:
© 2016 Microsoft