Invalid inter-thread operation: access it from a thread that is not creating the control "Button1".

The control cannot be accessed across threads after the. Net2. , the control on the form is created by the current main thread, and when the user executes a method asynchronously: Assign a value to the control on the form in the method, remember: When executing an asynchronous delegate, it is actually

is to open a thread to execute that method, which will cause an error: the operation between threads is invalid: it is accessed from a thread that does not create the control "XXX".

In C # WinForm development, this is a more common exception: the Inter-threading operation is not valid, and it is accessed from a thread that does not create the control "XXX". This anomaly comes from. A limitation of NET2: A worker thread cannot access a control created by a window thread. There are two main workarounds, one of which is to set Checkforillegalcrossthreadcalls = False in the window thread, and the other to be cumbersome, invoking the Invoke method in the same way as a delegate.

 Public Form1 ()        {            InitializeComponent ();             false ;        }

But the above is not the recommended method. A better way is to use a delegate to solve

  Private voidButton1_Click (Objectsender, EventArgs e) {            NewAction (show). BeginInvoke (NULL,NULL); }        voidShow () {//asynchronous outside of the method. This form will not feign death             while(true) {Thread.Sleep ( -); Action AC=NewAction (Showtext);  This. Invoke (AC);//implement updating data on a form within a synchronization method            }        }        /// <summary>        ///Update Data/// </summary>        voidShowtext () {Richtextbox1.appendtext ("update \ n"); }

Or use the InvokeRequired property to determine

/*
Summary:
Gets a value that indicates whether the caller must call the Invoke method when making a method call to the control, because the call is in a thread other than the one on which the control is created.
//
return Result:
If the System.Windows.Forms.Control.Handle of the control is created on a different thread than the calling thread (the description you must pass the Invoke
method is called for the control), or false.

Private voidButton1_Click (Objectsender, EventArgs e) {            //new Action (show). BeginInvoke (null, NULL);            NewAction (SHOW1). BeginInvoke (NULL,NULL); }        voidShow1 () { while(true) {Thread.Sleep ( -);//Simulation Wait EffectShow2 (); }        }        voidShow2 () {//description of the current external thread            /*//Summary://Gets a value that indicates whether the caller must call the Invoke method when making a method call to the control, because the call is in a thread other than the one on which the control is created. Returns the result://If the System.Windows.Forms.Control.Handle of the control is created on a different thread than the calling thread (instructions you must pass the Invoke//party             Is true if the control is called), otherwise false. */            if(invokerequired) {/*since it is an external thread, then there is no permission to access the control on the main thread * therefore to the main thread access, open an asynchronous delegate bundle to execute the method * to the main thread execution*/Action AC=NewAction (SHOW2);  This. Invoke (AC);//after execution here. Then the invokerequired is false. Because this is already the main thread accessing the currently created control            }            Else{Richtextbox1.appendtext ("Update 77\n"); }        }

Reference: http://www.cnblogs.com/txw1958/archive/2012/08/21/2649192.html

Invalid inter-thread operation: access it from a thread that is not creating the control "Button1".