C#制作WinForm用户自定义控件实例教程
本文将教大家如何使用C#开发WinForm用户自定义控件，自定义控件有好多好处，下面请跟本文一同来学习下吧。

.Nt用户自定义控件继承UserControl类，设计很简单的，像平时在窗体上拖控件一样。

操作步骤：
1. 建立一个工程，添加用户控件。

2.在打开的窗体内输入控件名称，如:"ucButton"，按确定按钮。

接下来在空白区域拖放3个.Net控件。

如下图：
3.代码
C# code
/// <summary> /// C#.Net 设计用户自定义控件 /// </summary> /// </summary> [ToolboxBitmap(typeof(CustomControl.ucButton), "ucButton.bmp")] public partial class ucButton : UserControl { private bool _IsFocused = false; //标记按钮是否为焦点状态 public ucButton() { InitializeComponent(); this.DoHideFocusedTag(); this.MyCatpionText = ; } private EventHandler _OnButtonClick = null; private string _MyCatpionText = "ucButton1"; /// <summary> /// 按钮标题 /// </summary> [EditorBrowsable(EditorBrowsableState.Always)] [Browsable(true)] [DefaultValue("ucButton1")] public string MyCatpionText { get { return _MyCatpionText; } set { _MyCatpionText = value; lblCaption.Text =
_MyCatpionText; } } /// <summary> /// 用户自定义Click事件 /// </summary> [EditorBrowsable(EditorBrowsableState.Always)] [Browsable(true)]
public event EventHandler OnButtonClick { add { _OnButtonClick = new EventHandler(value); } remove { _OnButtonClick -= new
EventHandler(value); } } private void lblCaption_Click(object sender, EventArgs e) { //转移Click事件, 触发用户自定义事件 if
(_OnButtonClick != null) _OnButtonClick(this, e); } private void lblCaption_MouseDown(object sender, MouseEventArgs e) { if (_IsFocused) { lblCaption.Font = new Font(lblCaption.Font.FontFamily,
lblCaption.Font.Size, FontStyle.Bold); } } private void
lblCaption_MouseUp(object sender, MouseEventArgs e) { if (_IsFocused) { lblCaption.Font = new Font(lblCaption.Font.FontFamily,
lblCaption.Font.Size, FontStyle.Regular); } } private void
ucButton_SizeChanged(object sender, EventArgs e) { lblUnderLine.Top = this.Height - 1; lblUnderLine.Width = this.Width - 15; } /// <summary> /// 还原按钮状态 /// </summary> public void DoHideFocusedTag() { this.pictureBox1.Image =
global::vjsdn.CustomControl.Properties.Resources.GrayTag;
this.lblUnderLine.Visible = false; lblCaption.ForeColor = Color.Black; } /// <summary> /// 设计按钮为焦点状态 /// </summary> public void DoShowFocusedTag() { this.pictureBox1.Image =
global::vjsdn.CustomControl.Properties.Resources.FosedTag;
this.lblUnderLine.Visible = true; lblCaption.ForeColor = Color.Blue; } private void
ucButton_MouseEnter(object if (this.Parent != null) { foreach (Control c in this.Parent.Controls) { if (c is ucButton) (c as ucButton).DoHideFocusedTag(); } }
this.DoShowFocusedTag(); _IsFocused = true; }
[EditorBrowsable(EditorBrowsableState.Always)] [Browsable(true)] [Description("")] public Label MyCaption { get { return lblCaption; } } private void lblCaption_MouseEnter(object sender, EventArgs e)
{ this.ucButton_MouseEnter(sender, e); }
4. 按F5编译项目，建立一个测试窗体，在控件工具栏会看到有个齿轮图标的项目。

在窗体上拖3个ucButton。

5.设置按钮标题及事件。

就这么简单，然后按F5运行下程序就可以看到自定义控件的效果了。