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This article introduces the knowledge of "how to understand the C# form closing event". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. The first step

2. Step 2

After the name is named, double-click the name to edit the event, and if you can't find it, you can go to the .cs file and check it for yourself.

Private void frmMom_FormClosing (object sender, FormClosingEventArgs e) {DialogResult result = MessageBox.Show ("are you sure you want to close it!" , "prompt message", MessageBoxButtons.OKCancel, MessageBoxIcon.Information); if (result = = DialogResult.OK) {Console.WriteLine ("1"); e.Cancel = false; / / Click OK} else {Console.WriteLine ("2"); e.Cancel = true Finally, you can check the file of the design designer.cs to see if it is correct.

This.FormClosing + = new System.Windows.Forms.FormClosingEventHandler (this.frmMom_FormClosing)

This.frmMom_FormClosing can't have the same name as FormClosing or report an error. Remember.

Another property is FormClosed, which is used for the method you want to execute after closing the page, such as shutting down a service after closing the page.

C # uses multithreading, how to close all threads of the form when closing the form to make the program exit.

This.Close (); just close the current window. If it is not the main form, you cannot exit the program, and if there is a managed thread (non-main thread), you cannot exit cleanly.

Application.Exit (); forces all messages to abort and exits all forms, but cannot exit cleanly if there is a managed thread (non-main thread)

Application.ExitThread (); force to abort all messages on the calling thread, but also face the problem that other threads cannot exit correctly

System.Environment.Exit (0); this is the most thorough way to exit. No matter what thread is forced to exit, the program ends cleanly.

Thread_VIEW.Abort (); close the Thread_VIEW thread

Thread_SAVE.Abort (); close the Thread_SAVE thread

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