当前文件路径：HeroBeastControlsNavMenu/NavMenu/Converter/NavMenuSubItemConverter.cs

		            
 1using System;
 2using System.Collections.Generic;
 3using System.ComponentModel;
 4using System.Text;
 5using System.Web;
 6using System.Web.UI;
 7using System.Web.UI.WebControls;
 8using System.Globalization;
 9
10//该源码下载自www.51aspx.com(５１ａｓｐx．ｃｏｍ)
11namespace HeroBeastControls.NavMenu
12...{
13    public class NavMenuSubItemConverter : ExpandableObjectConverter
14    ...{
15        方法#region 方法
16
17        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
18        ...{
19            if (sourceType == typeof(string))
20            ...{
21                return true;
22            }
23            return base.CanConvertFrom(context, sourceType);
24        }
25
26        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
27        ...{
28            if (destinationType == typeof(string))
29            ...{
30                return true;
31            }
32            return base.CanConvertTo(context, destinationType);
33        }
34
35        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture,
36            object value)
37        ...{
38            if (value == null)
39            ...{
40                return new NavMenuSubItem();
41            }
42            if (value is string)
43            ...{
44                string s = (string)value;
45                if (s.Length == 0)
46                ...{
47                    return new NavMenuSubItem();
48                }
49                return "NavMenuSubItem";
50
51            }
52            return base.ConvertFrom(context, culture, value);
53        }
54
55        public override object ConvertTo(
56            ITypeDescriptorContext context,
57            CultureInfo culture, object value, Type destinationType)
58        ...{
59            if (value != null)
60            ...{
61                if (!(value is NavMenuSubItem))
62                ...{
63                    throw new ArgumentException(
64                        "Invalid NavMenuSubItem", "value");
65                }
66            }
67
68            if (destinationType == typeof(string))
69            ...{
70                if (value == null)
71                ...{
72                    return String.Empty;
73                }
74                return "NavMenuSubItem";
75            }
76            return base.ConvertTo(context, culture, value,
77                destinationType);
78        }
79        #endregion
80    }
81}
82