改变 propertygrid 控件的编辑风格（2）——编辑多行文本

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();

         }