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我想用c# 开发一个象button，treeview一样的控件，封状成.dll就行，请教各位

类型：转载责任编辑：asp.net 日期：2007/05/23

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发表者：tingpig

using System.ComponentModel;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Runtime.InteropServices;

namespace CustomControls
{
/// <summary>
/// NumbersOnlyTextBox class
/// </summary>
[Designer(typeof(NumbersOnlyTextBox.NumbersOnlyTextBoxDesigner))]
public class NumbersOnlyTextBox : System.Windows.Forms.TextBox
{
#region Static Fields

[DllImport("user32.dll")]
private static extern bool MessageBeep(uint uType);

#endregion

#region Method Overrides

protected override bool ProcessKeyEventArgs(ref Message m)
{
int keyValue = m.WParam.ToInt32();
// (keyValue > 47 && keyValue <58) ?Numbers 0 ?9
// keyValue == 46 - Decimal point
// (keyValue > 34 && keyValue <41) ?Home, End, and Arrow Keys
// keyValue == 8 ?Backspace Key
if ((keyValue > 47 && keyValue <58) || keyValue == 46 || (keyValue > 34 && keyValue <41) || keyValue == 8)
{
return base.ProcessKeyPreview(ref m);
}
else
{
// Delete Key
if (m.Msg == 256 && keyValue == 46)
{
return base.ProcessKeyPreview(ref m);
}
// Windows message id used to limit 1 beep per keystroke
if (m.Msg == 258)
{
MessageBeep(0);
}
return true;
}
}

#endregion

#region Internal Classes

/// <summary>
/// NumbersOnlyTextBoxDesigner class
/// </summary>
internal class NumbersOnlyTextBoxDesigner : ControlDesigner
{
#region Method Overrides

protected override void PostFilterProperties(System.Collections.IDictionary properties)
{
properties.Remove("Text");
}

#endregion
}

#endregion
}
}

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