转帖自：http://www.cnblogs.com/greatverve/archive/2012/04/25/2354519.html
自定义控件分三类：
1.复合控件：基本控件组合而成。继承自UserControl
2.扩展控件：继承基本控件，扩展一些属性与事件。比如继承Button
3.自定义控件：直接继承自Control
今天把扩展控件简单入门。
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步骤一：这里首先要建一个Windows控件库项目。
步骤二：新建用户控件，修改代码(注意注释掉.Designer.cs文件中的代码)
扩展Button
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WinFormControlLibrary
{
public partial class UcButton : Button
{
public UcButton()
{
InitializeComponent();
}
// Creates the private variable that will store the value of your
// property.
private int varValue;
// Declares the property.
public int ButtonValue
{
// Sets the method for retrieving the value of your property.
get
{
return varValue;
}
// Sets the method for setting the value of your property.
set
{
varValue = value;
}
}
}
}
修改.Desinger.cs
namespace WinFormControlLibrary
{
partial class UcButton
{
///
/// Required designer variable.
///
private System.ComponentModel.IContainer components = null;
///
/// Clean up any resources being used.
///
/// true if managed resources should be disposed; otherwise, false.
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Component Designer generated code
///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
private void InitializeComponent()
{
components = new System.ComponentModel.Container();
//把这句注释掉
//this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
}
#endregion
}
}
扩展Label
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WinFormControlLibrary
{
public partial class UcLabel : Label
{
public UcLabel()
{
InitializeComponent();
}
protected override void OnMouseEnter(EventArgs e)
{
base.OnMouseEnter(e);
this.Font = new Font("宋体", 10F, FontStyle.Underline);
}
protected override void OnMouseLeave(System.EventArgs e)
{
base.OnMouseLeave(e);
this.Font = new Font("宋体", 10F, FontStyle.Regular);
}
}
}
步骤三：在其他Windows窗体项目中添加项目引用。编译之后就在工具箱看到生成的自定义控件。
url:http://greatverve.cnblogs.com/archive/2012/02/16/user-control-Inherit.html
参考msdn：
http://msdn.microsoft.com/zh-cn/library/5h0k2e6x(v=vs.80).aspx
http://blog.csdn.net/yysyangyangyangshan/article/details/7078471