什么是用户控件，自定义控件和组件之间的区别？ [英] What is the difference between User Control, Custom Control and Component?

问题描述

这是三个不同的东西，你可以添加到一个项目，我不是很肯定，如果我理解上的差异。他们似乎都比如说在部件工具箱中显示了一个表格时。什么是他们每个人的一些常见的使用场景？有什么区别？

These are three different things you can add to a project and I am not quite sure if I understand the difference. They all seem to for example show up in the component toolbox when working with a Form. What are some common usage scenarios for each of them? What is the difference?

推荐答案

用户控制之间的主要区别，自定义控件和组件的是，他们从不同的层面的继承树继承：

The main difference between User Control, Custom Control and Component is that they inherit from different levels in the inheritance tree:

MyComponent
   |-> Component

MyCustomControl
   |-> Control
          |-> Component

MyUserControl
   |-> ContainerControl
          |-> ScrollableControl
                 |-> Control
                        |-> Component

所以，总之你获得不同金额的pre-连接功能不同的选项。

So, in short you get a different amount of pre-wired functionality with the different options.

当您需要使用不同的选项？ （这些想法和意见，而不是真理）

When would you use the different options? (these are thoughts and opinions, not truths)

• 创建一个组件如果您想提供的功能，而用户界面（如定时器组件，数据源，...）


• 创建一个自定义控制如果你想，你有充分的在其外观的控制，然后你不想要的不必要的功能的行李一个组成部分。典型案例是具有有限功能的简单控件（如按钮）


• 创建一个用户控制如果您打算为结合现有的控制成可重用的构建块（如两个列表的按钮，你可以在列表之间移动项目）。

• Create a component if you want to provide functionality without UI (such as Timer components, data sources, ...)
• Create a custom control if you want to make a component where you have full control over its visual appearance, and you don't want any baggage of unnecessary functionality. Typical cases would be simple controls with limited functionality (such as a button)
• Create a user control if you are going to combine existing controls into reusable building blocks (such as two lists with buttons where you can move items between the lists).

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