改变 propertygrid 控件的编辑风格（3）——打开对话框
适用场合：
1、 打开文件、打印设置等通用对话框
2、 打开特定的对话框
步骤一：定义从uitypeeditor 派生的类，以 openfiledialog 对话框为例，示例代码如下：
using system;
using system.windows.forms;
using system.drawing.design;
using system.windows.forms.design;
namespace blog.csdn.net.zhangyuk
{
/// <summary>
/// imsopenfileinpropertygrid 的摘要说明。
/// </summary>
public class propertygridfileitem : uitypeeditor
{
public override uitypeeditoreditstyle geteditstyle(
system.componentmodel.itypedescriptorcontext context)
{
return uitypeeditoreditstyle.modal;
}
public override object editvalue(
system.componentmodel.itypedescriptorcontext context,
system.iserviceprovider provider,
object value)
{
iwindowsformseditorservice edsvc = (iwindowsformseditorservice)
provider.getservice(typeof(iwindowsformseditorservice));
if( edsvc != null )
{
// 可以打开任何特定的对话框
openfiledialog dialog = new openfiledialog();
dialog.addextension = false;
if( dialog.showdialog().equals(dialogresult.ok) )
{
return dialog.filename;
}
}
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 = "";
……
// 文件
string _filename = "";
[
description("文件打开对话框"),
category("属性"),
editorattribute(typeof(propertygridfileitem),
typeof(system.drawing.design.uitypeeditor))
]
public string 文件
{
get { return _filename; }
set { _filename = 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();
}