.NET MVC3中擴充一個HtmlHelper方法CheckBoxList

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MVC中有DropDownList方法，挺好用，可是最常用的需求，一組checkboxlist咋沒個類似方法呢？鬱悶之餘，自己做一個吧，直接上代碼

public static MvcHtmlString CheckBoxList(this HtmlHelper helper, string name, IEnumerable<SelectListItem> selectList) { return CheckBoxList(helper, name, selectList, new { }); } public static MvcHtmlString CheckBoxList(this HtmlHelper helper, string name, IEnumerable<SelectListItem> selectList, object htmlAttributes) { IDictionary<string, object> HtmlAttributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes); HashSet<string> set = new HashSet<string>(); List<SelectListItem> list = new List<SelectListItem>(); string selectedValues = Convert.ToString((selectList as SelectList).SelectedValue); if (!string.IsNullOrEmpty(selectedValues)) { if (selectedValues.Contains(",")) { string[] tempStr = selectedValues.Split(‘,‘); for (int i = 0; i < tempStr.Length; i++) { set.Add(tempStr[i]); } } else { set.Add(selectedValues); } } foreach (SelectListItem item in selectList) { item.Selected = (item.Value != null) ? set.Contains(item.Value) : set.Contains(item.Text);list.Add(item); } selectList = list; HtmlAttributes.Add("type", "checkbox"); HtmlAttributes.Add("id", name); HtmlAttributes.Add("name", name); HtmlAttributes.Add("style", "margin:0 0 0 10px;line-height:30px; vertical-align:-8px;border:none;"); StringBuilder stringBuilder = new StringBuilder(); foreach (SelectListItem selectItem in selectList) { IDictionary<string, object> newHtmlAttributes = HtmlAttributes.DeepCopy(); newHtmlAttributes.Add("value", selectItem.Value); if(selectItem.Selected) { newHtmlAttributes.Add("checked", "checked"); } TagBuilder tagBuilder = new TagBuilder("input"); tagBuilder.MergeAttributes<string, object>(newHtmlAttributes); string inputAllHtml= tagBuilder.ToString(TagRenderMode.SelfClosing); stringBuilder.AppendFormat(@"<label style=""margin:0 0 0 10px;""> {0} {1}</label>", inputAllHtml, selectItem.Text); } return MvcHtmlString.Create(stringBuilder.ToString()); } private static IDictionary<string, object> DeepCopy(this IDictionary<string, object> ht) { Dictionary<string, object> _ht=new Dictionary<string,object>(); foreach (var p in ht) { _ht.Add(p.Key, p.Value); } return _ht; } 

可以直接拿去用

產生的每一個checkbox外部都有一個label，感覺不錯，不喜歡可以去掉，還有一個HtmlAttributes.Add("style", "margin:0 0 0 10px;line-height:30px; vertical-align:-8px;border:none;"); 是為了讓顯示更好看的，如果在你的樣式下面位置不好看你可以把這行去掉

.NET MVC3中擴充一個HtmlHelper方法CheckBoxList