适用场合：
1、 编辑多行文本；
2、 编辑长文本。
步骤一：定义从UITypeEditor 派生的类，示例如下：
using System;
using System.Windows.Forms;
using System.Drawing.Design;
using System.Windows.Forms.Design;
namespace blog.csdn.net.zhangyuk
{
/// <summary>
/// PropertyGridMutiText 的摘要说明。
/// </summary>
public class PropertyGridRichText : UITypeEditor
{
public override UITypeEditorEditStyle GetEditStyle(
System.ComponentModel.ITypeDescriptorContext context)
{
return UITypeEditorEditStyle.DropDown;
}
public override object EditValue(
System.ComponentModel.ITypeDescriptorContext context,
System.IServiceProvider provider,
object value)
{
try
{
IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)
provider.GetService(typeof(IWindowsFormsEditorService));
if( edSvc != null )
{
if( value is string )
{
RichTextBox box = new RichTextBox();
box.Text = value as string;
edSvc.DropDownControl( box );
return box.Text;
}
}
}
catch( Exception ex )
{
System.Console.WriteLine( 'PropertyGridRichText Error : ' + ex.Message );
return value;
}
return value;
}
}
}
步骤二：编辑属性类，指定编辑属性。示例如下：
namespace blog.csdn.net.zhangyuk
{
public class SomeProperties
{
private string _finished_time = '';
……
// 多行文本编辑框
string _mutiLineSample = '';
[
Description('多行文本编辑框'),
Category('属性'),
EditorAttribute(typeof(PropertyGridRichText),
typeof(System.Drawing.Design.UITypeEditor))
]
]
public String 多行文本
{
get { return _mutiLineSample; }
set { _mutiLineSample = value;}
}
……
}
}
步骤三：设置PropertyGrid的属性对象。示例如下：
private void Form1_Load(object sender, System.EventArgs e)
{
this.propertyGrid1.SelectedObject = new SomeProperties();
}
