MVC 枚举绑定 DropDownList

  1         /// <summary>
  2         /// 枚举转化下拉列表数据集
  3         /// </summary>
  4         /// <param name="type">类型</param>
  5         /// <param name="selected">选中项</param>
  6         /// <returns>结果</returns>
  7         public static IEnumerable<SelectListItem> EnumToListItem(Type type, string selected)
  8         {
  9             IList<SelectListItem> list = new List<SelectListItem> { new SelectListItem { Text = "全部", Value = string.Empty } };
 10             Array array = Enum.GetValues(type);
 11             foreach (int item in array)
 12             {
 13                 string text = Enum.GetName(type, item);
 14                 var selectListItem = new SelectListItem
 15                 {
 16                     Text = text,
 17                     Value = item.ToString(CultureInfo.InvariantCulture),
 18                     Selected = !string.IsNullOrEmpty(selected) && selected == text
 19                 };
 20                 list.Add(selectListItem);
 21             }
 22 
 23             return list;
 24         }
 25 
 26         /// <summary>
 27         /// 自定义DropDownList
 28         /// </summary>
 29         /// <param name="htmlHelper">htmlHelper</param>
 30         /// <param name="name">name</param>
 31         /// <param name="selectList">下拉列表集合</param>
 32         /// <param name="obj">属性</param>
 33         /// <returns>MvcHtmlString</returns>
 34         public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList, object obj)
 35         {
 36             string fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
 37             if (string.IsNullOrEmpty(fullName))
 38             {
 39                 throw new ArgumentException("name");
 40             }
 41 
 42             StringBuilder listItemBuilder = new StringBuilder();
 43             foreach (SelectListItem item in selectList)
 44             {
 45                 TagBuilder builder = new TagBuilder("option")
 46                 {
 47                     InnerHtml = HttpUtility.HtmlEncode(item.Text)
 48                 };
 49 
 50                 if (item.Value != null)
 51                 {
 52                     builder.Attributes["value"] = item.Value;
 53                 }
 54 
 55                 if (item.Selected)
 56                 {
 57                     builder.Attributes["selected"] = "selected";
 58                 }
 59 
 60                 listItemBuilder.AppendLine(builder.ToString(TagRenderMode.Normal));
 61             }
 62 
 63             TagBuilder tagBuilder = new TagBuilder("select")
 64             {
 65                 InnerHtml = listItemBuilder.ToString()
 66             };
 67 
 68             if (obj != null)
 69             {
 70                 IDictionary<string, object> htmlAttributes = new RouteValueDictionary(obj);
 71                 tagBuilder.MergeAttributes(htmlAttributes);
 72             }
 73             tagBuilder.MergeAttribute("name", fullName, true);
 74             tagBuilder.GenerateId(fullName);
 75 
 76             return new MvcHtmlString(tagBuilder.ToString(TagRenderMode.Normal));
 77         }
 78 
 79         /// <summary>
 80         /// 自定义DropDownList
 81         /// </summary>
 82         /// <param name="htmlHelper">htmlHelper</param>
 83         /// <param name="name">name</param>
 84         /// <param name="selectList">下拉列表集合</param>
 85         /// <returns>MvcHtmlString</returns>
 86         public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList)
 87         {
 88             return DropDownList(htmlHelper, name, selectList, null);
 89         }
 90 
 91         /// <summary>
 92         /// 自定义DropDownList
 93         /// </summary>
 94         /// <param name="htmlHelper">htmlHelper</param>
 95         /// <param name="type">枚举类型</param>
 96         /// <param name="name">name属性</param>
 97         /// <param name="selected">选择项目</param>
 98         /// <param name="obj">其他属性</param>
 99         /// <returns>DropDownList</returns>
100         public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, Type type, string name, string selected, object obj)
101         {
102             IEnumerable<SelectListItem> selectListItem = EnumToListItem(type, selected);
103             return DropDownList(htmlHelper, name, selectListItem, obj);
104         }
105 
106         /// <summary>
107         /// 自定义DropDownList
108         /// </summary>
109         /// <param name="htmlHelper">htmlHelper</param>
110         /// <param name="type">枚举类型</param>
111         /// <param name="name">name属性</param>
112         /// <param name="selected">选择项目</param>
113         /// <returns>DropDownList</returns>
114         public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, Type type, string name, string selected)
115         {
116             return DropDownList(htmlHelper, type, name, selected, null);
117         }
118 
119         /// <summary>
120         /// 自定义DropDownList
121         /// </summary>
122         /// <param name="htmlHelper">htmlHelper</param>
123         /// <param name="type">枚举类型</param>
124         /// <param name="name">name属性</param>
125         /// <param name="obj">其他属性</param>
126         /// <returns>DropDownList</returns>
127         public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, Type type, string name, object obj)
128         {
129             return DropDownList(htmlHelper, type, name, null, obj);
130         }
131 
132         /// <summary>
133         /// 自定义DropDownList
134         /// </summary>
135         /// <param name="htmlHelper">htmlHelper</param>
136         /// <param name="type">枚举类型</param>
137         /// <param name="name">name属性</param>
138         /// <returns>DropDownList</returns>
139         public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, Type type, string name)
140         {
141             return DropDownList(htmlHelper, type, name, null, null);
142         }