PropertyGrid控制項下拉式清單

 把別人的例子稍做了一下修改，部分內容沒看懂，但程式可以運行，如果有什麼錯誤或不當之處，請指教！

 

 1         /// <summary>
 2         /// 一.自訂一個屬性類別ListAttribute,提供下拉式清單值:
 3         /// </summary>
 4          public class ListAttribute : Attribute
 5         {
 6             public string[] _lst;
 7 
 8             public ListAttribute(string[] lst)
 9             {
10                 //初始化列表值  
11                  _lst =lst;
12             }
13         }
14 
15         /// <summary>
16         /// 二.特性轉換器MyConverter 
17         /// </summary>
18          public class MyConverter : ExpandableObjectConverter
19         {
20             public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
21             {
22                 return true;
23             }
24 
25             public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
26             {
27                 return true;
28             }
29 
30             public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
31             {
32                 ListAttribute listAttribute = (ListAttribute)context.PropertyDescriptor.Attributes[typeof(ListAttribute)];
33                 StandardValuesCollection vals = new TypeConverter.StandardValuesCollection(listAttribute._lst);
34 
35                 return vals;
36             }
37 
38             public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
39             {
40                 return true;
41             }
42         }
43 
44         /// <summary>
45         /// 三.應用樣本：
46         /// </summary>
47         public class MyObject
48         {
49             private string _name;
50 
51             [CategoryAttribute("資訊"), DescriptionAttribute("姓名"),
52             TypeConverter(typeof(MyConverter)), ListAttribute( new string[] { "張三", "李四", "王五", "趙六", "馬七" })]
53             public string Name
54             {
55                 get { return _name; }
56                 set { _name = value; }
57             }
58         }
59 
60         private void Form1_Load(object sender, EventArgs e)
61         {
62             this.propertyGrid1.SelectedObject = new MyObject();
63         }

顯示效果如下: