高手快来，关于自定义的用户控件的问题！！

Question

using System;
using System.ComponentModel;
using System.Windows.Forms;namespace PropertyStudy
{
/// <summary>
/// MyPannel 的摘要说明。
/// </summary>
public class MyPannel : System.Windows.Forms.Panel
{
public MyPannel()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
private string des; [DefaultValueAttribute("Jason")]
[Category("微观")]
[Description("一个简单的描述")]
public string Des
{
get{return this.des;}
set{this.des = value;}
} private string filename;
/// <summary>
/// 下拉菜单的形式
/// </summary>
[CategoryAttribute("自定义的复杂类型设置(包括自定义类型转换器)"),
TypeConverterAttribute(typeof(PropertyStudy.FileNameConvertor)),
ReadOnlyAttribute(false)]
public string FileName
{
get{return this.filename;}
set{this.filename = value;}
}
private ExpandProperty _dropList = new ExpandProperty();
/// <summary>
/// 展开形式的属性
/// </summary>
[CategoryAttribute("自定义的复杂类型设置(包括自定义类型转换器)"),
TypeConverterAttribute(typeof(PropertyStudy.ExpandConverter)),
ReadOnlyAttribute(false)]
public ExpandProperty DropList
{
get { return this._dropList;}
set { this._dropList= value;}
}
private string _appVer="1.0"; 
/// <summary>
/// 弹出对话框的形式
/// </summary>
[CategoryAttribute("自定义编辑器"),
DefaultValueAttribute("1.0"),
DescriptionAttribute("版本信息"),
ReadOnlyAttribute(true),
EditorAttribute(typeof(AppVerConverter),typeof(System.Drawing.Design.UITypeEditor))]
public string AppVer
{
get {return this._appVer;}
set {this._appVer=value;}
}
private System.Drawing.Point _dropUI;
/// <summary>
/// 下拉UI
/// </summary>
[CategoryAttribute("自定义编辑器"),
DefaultValueAttribute("1"),
DescriptionAttribute("下拉可视控件"),
ReadOnlyAttribute(false),
EditorAttribute(typeof(DropEditor),typeof(System.Drawing.Design.UITypeEditor))]
public System.Drawing.Point DropUI
{
get { return this._dropUI;}
set { this._dropUI=value; }
}
}

Answer 1

/// <summary>
/// 扩展字符串的转换器（实现下拉列表框的样式）
/// </summary>
public class FileNameConvertor : System.ComponentModel.StringConverter
{
/// <summary>
/// 根据返回值确定是否支持下拉框的形式
/// </summary>
/// <returns>
/// true: 下来框的形式
/// false: 普通文本编辑的形式
/// </returns>
public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
{
return true;
}

/// <summary>
/// 下拉框中具体的内容
/// </summary>
public override System.ComponentModel.TypeConverter.StandardValuesCollection GetStandardValues(System.ComponentModel.ITypeDescriptorContext context)
{
return new StandardValuesCollection(new string[]{"File1.bat","File2.exe","File3.dll"});
} /// <summary>
/// 根据返回值确定是否是不可编辑的文本框
/// </summary>
/// <returns>
/// true:  文本框不可以编辑
/// flase: 文本框可以编辑
/// </returns>
public override bool GetStandardValuesExclusive(System.ComponentModel.ITypeDescriptorContext context)
{
return true;
}
}
/// <summary>
/// 用来进行展开的形式演示
/// </summary>
public class ExpandProperty
{
private int _intList=0; public int IntList
{
get { return this._intList;}
set { this._intList=value; }
} private string _strList="Null"; public string StrList
{
get { return this._strList;}
set { this._strList= value;}
}
}

Answer 2

/// <summary>
///  可以展开的类型转换器
///     ExpandProperty
/// </summary>
public class ExpandConverter:System.ComponentModel.ExpandableObjectConverter
{
public ExpandConverter()
{
} /// <summary>
/// 覆盖此方法已确定属性是否可以转换
/// </summary>
public override bool CanConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Type destinationType)
{
if (destinationType==typeof(PropertyStudy.ExpandProperty))
return true;
return base.CanConvertTo(context,destinationType);
} /// <summary>
/// 覆盖此方法并确保destinationType参数是一个String，然后格式化所显示的内容
/// </summary>
public override object ConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, System.Type destinationType)
{
if (destinationType == typeof (System.String) && value is PropertyStudy.ExpandProperty)
{
PropertyStudy.ExpandProperty source=(PropertyStudy.ExpandProperty)value;
return source.IntList+","+source.StrList;
}
return base.ConvertTo(context,culture,value,destinationType);
  } /// <summary>
/// 覆盖此方法已确定输入的字符串是可以被转化
/// </summary>
public override bool CanConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Type sourceType)
{
if (sourceType==typeof(string))
return true;
return base.CanConvertFrom(context,sourceType);
} /// <summary>
/// 覆盖此方法根据 ConvertTo() 方法的转换格式来把所输入的字符串转换成类，并返回该类
/// </summary>
public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
if (value is string)
{
string s=(string)value;
int comma=s.IndexOf(",");
if (comma!=-1)
{
try
{
string intList=s.Substring(0,comma);
string strList=s.Substring(comma+1,s.Length-comma-1);
PropertyStudy.ExpandProperty Ep=new ExpandProperty();
Ep.IntList=int.Parse(intList);
Ep.StrList=strList;
return Ep;
}
catch
{
return base.ConvertFrom(context,culture,value);
}
}
}
return base.ConvertFrom(context,culture,value);
}
} /// <summary>
/// 自定义UI的属性编辑器(弹出消息)
/// </summary>
public class AppVerConverter:System.Drawing.Design.UITypeEditor
{
/// <summary>
/// 覆盖此方法以返回编辑器的类型。
/// </summary>
public override System.Drawing.Design.UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
{
return System.Drawing.Design.UITypeEditorEditStyle.Modal;
} /// <summary>
/// 覆盖此方法以显示版本信息
/// </summary>
public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, System.IServiceProvider provider, object value)
{
System.Windows.Forms.MessageBox.Show("版本:1.0\n作者:张翔","版本信息");
return value;
}
}
public class DropEditor:System.Drawing.Design.UITypeEditor
{
public override System.Drawing.Design.UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
{
return System.Drawing.Design.UITypeEditorEditStyle.DropDown;
} public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, System.IServiceProvider provider, object value)
{
System.Windows.Forms.Design.IWindowsFormsEditorService iws=(System.Windows.Forms.Design.IWindowsFormsEditorService)provider.GetService(typeof(System.Windows.Forms.Design.IWindowsFormsEditorService));
if (iws!=null)
{
PropertyStudy.DropUIControl UIControl=new PropertyStudy.DropUIControl((System.Drawing.Point)value,iws);
iws.DropDownControl(UIControl);
return UIControl.Value;
}
return value;
}
} internal class DropUIControl:System.Windows.Forms.UserControl
{
public DropUIControl(System.Drawing.Point avalue,System.Windows.Forms.Design.IWindowsFormsEditorService iws)
{
this.Value=avalue;
this._tmpvalue=avalue;
this._iws=iws;
this.SetStyle(System.Windows.Forms.ControlStyles.DoubleBuffer|System.Windows.Forms.ControlStyles.UserPaint|System.Windows.Forms.ControlStyles.AllPaintingInWmPaint,true);
this.BackColor=System.Drawing.SystemColors.Control;
}
private System.Drawing.Point _value; public System.Drawing.Point Value
{
get { return this._value;}
set { this._value=value; }
} 
private System.Drawing.Point _tmpvalue;
private System.Windows.Forms.Design.IWindowsFormsEditorService _iws; protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
string str="X:"+this._tmpvalue.X.ToString()+"  ;Y:"+this._tmpvalue.Y.ToString();
System.Drawing.Graphics g=e.Graphics;
System.Drawing.SizeF sizef= g.MeasureString(str,this.Font);
g.DrawString(str,this.Font,
new System.Drawing.SolidBrush(System.Drawing.Color.Black),
(int)((this.Width-(int)sizef.Width)/2),
this.Height-(int)sizef.Height);
g.PageUnit=System.Drawing.GraphicsUnit.Pixel;
g.FillEllipse(new System.Drawing.SolidBrush(System.Drawing.Color.Red),
this.Value.X-2,this.Value.Y-2,4,4);
} protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e)
{
base.OnMouseMove(e);
this._tmpvalue=new System.Drawing.Point(e.X,e.Y);
this.Invalidate();
} protected override void OnMouseUp(System.Windows.Forms.MouseEventArgs e)
{
base.OnMouseUp(e);
this.Value=this._tmpvalue;
this.Invalidate();
if (e.Button==System.Windows.Forms.MouseButtons.Left)
this._iws.CloseDropDown();
}
}
}

Answer 3

万分感谢“ brightheroes(闭关|学习ASP.NET中~) ”
佩服佩服！！！

Answer 4

请参考：
http://www.csdn.net/develop/Read_Article.asp?id=24936
http://www.csdn.net/develop/Read_Article.asp?id=24937
http://www.csdn.net/develop/Read_Article.asp?id=24938
http://www.csdn.net/develop/Read_Article.asp?id=24939经典文章收藏-------自定义属性的性质