改变 PropertyGrid 控件的编辑风格（3）——打开对话框

张昱e-zhangyu@vip.sina.com

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();

         }