改变 PropertyGrid 控件的编辑风格（2）——编辑多行文本

张昱e-zhangyu@vip.sina.com

效果：

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

{

///

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();

}