使PropertyGrid控件的属性值可以显示多行的方法

第一步：重写UITypeEditor的GetEditStyle方法；

第二部：重写UITypeEditor的EditValue方法；

 

具体实现如下：

 1 using System;

 2 using System.Collections.Generic;

 3 using System.Linq;

 4 using System.Text;

 5 using System.Threading.Tasks;

 6 using System.Windows.Forms.Design;

 7 using System.Drawing.Design;

 8 using System.Windows.Forms;

 9 

10 namespace PropertyGridDemo

11 {

12     public class PropertyGridRichText:UITypeEditor

13     {

14         public override UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)

15         {

16             return UITypeEditorEditStyle.DropDown;

17         }

18 

19         public override object EditValue(System.ComponentModel.ITypeDescriptorContext context,System.IServiceProvider provider,object value)

20         {

21             try

22             {

23                 IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));

24                 if (edSvc != null)

25                 {

26                     if (value is string)

27                     {

28                         RichTextBox box = new RichTextBox();

29                         box.Text = value as string;

30                         edSvc.DropDownControl(box);

31                         return box.Text;

32                     }

33                 }

34             }

35             catch (Exception ex)

36             {

37                 System.Console.WriteLine("PropertyGridRichText Error : " + ex.Message);

38                 return value;

39             }

40             return value;

41         }

42     }

43 }

调用方式为：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Linq;

using System.Text;

using System.Threading.Tasks;



namespace PropertyGridDemo

{

    public class Person

    {

        public int Id { get; set; }

        public string Name { get; set; }

        public string Sex { get; set; }



        [EditorAttribute(typeof(PropertyGridRichText), typeof(System.Drawing.Design.UITypeEditor)),Description("The person content!")]

        public string Content { get; set; }

    }

}

界面代码：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;



namespace PropertyGridDemo

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

            propertyGrid1.SelectedObject = new Person();

        }

    }

}

界面实现效果：