Reprint: C # This.invoke () role multithreaded Operation UI Understanding two

Invoke () performs the specified delegate on the main thread of the application. General application: This is called when the properties of an object in the UI thread (main thread) are modified in a worker thread. Invoke ();

 //Test the form Public classTestform:form {//Create a Button object    PrivateButton Button =NewButton (); //constructor Function     PublicTestform () {//set the properties of a buttonbutton. Size =NewSize ( Max, -);//sizebutton. Click + = button1_clicked;//Registering Eventsbutton. Text ="Click Start Test";//Set display text         This. Controls.Add (button);//Add to form         This. Text ="Multithreaded Example";//set the title bar text for a form    }      //Button's Click event Response method     Public voidButton1_clicked (Objectsender, EventArgs e) {          //Start a thread        NewThread (ThreadProc).      Start (); }      //Thread Functions     Public voidThreadProc () {//This . Invoke is a way to access the UI across threads, and this is an example of this article//first invoke an anonymous delegate to disable the button object         This. Invoke ((EventHandler)Delegate{button. Enabled=false;            }); //record a timestamp to demonstrate the countdown effect        intTick =Environment.tickcount;  while(Environment.tickcount-tick < +)          {              //A cross-thread call updates the properties of a control on a form, where the Text property of the button object is updated             This. Invoke ((EventHandler)Delegate{button. Text= ( +-Environment.tickcount + tick). ToString () +"start updating after microseconds";              }); //do a delay, avoid too fast, visual effect is not good. Thread.Sleep ( -); }          //demo, 10 digit increment display         for(inti =0; I <Ten; i++)          {               This. Invoke ((EventHandler)Delegate{button. Text=i.tostring ();              }); Thread.Sleep ( $); }          //Although not within the loop, please do not forget that your call is still in the worker thread, so you still need to invoke it. //restores the state, sets the text of the button to the initial state, and the Set button is available.          This. Invoke ((EventHandler)Delegate{button. Text="Click Start Test"; button. Enabled=true;      }); }  }  

Reprint: C # This.invoke () role multithreaded Operation UI Understanding two