如何使用C＃创建不带图形的用户控件

Question

How to create an user control without graphic?

When I create an user control using Windows Form Control Library , I saw this command line: public partial class UserControl1: UserControl . My friend told me to replace UserControl1: UserControl with UserControl1:Component,IDisposable . I don't know what Component,IDisposable is.

Answer 1

You can see what your friend is talking about if you take a look at one of the other components you can drop onto your Form that don't have their own interface:

public class BackgroundWorker : Component

public class ErrorProvider : Component, IExtenderProvider, ISupportInitialize

public class Timer : Component

You can easily create your own:

public class MyVeryOwnComponent : Component
{
    public string Setting1 { get; set; }
    public string Setting2 { get; set; }

    public void SomeImportantMethodYouCanCall()
    {
       // ...
    }
}

And drop it on your Form: (you'll have to rebuild first, to get it to show in the Toolbox)

Answer 2

What you are talking about is a "Component" which is any class derived from System.ComponentModel.Component . A control is a special type of component which derives from the class System.Windows.Forms.Control .

If you want to make your own component just make your class derive from Component , which is what your friend did with the :Component,IDisposable . The IDisposable part was not needed because Component already implements IDisposeable and could be left off.