我有一个自定义助手,我收到一个htmlAttributes作为参数:
public static MvcHtmlString Campo<TModel,TValue>( this HtmlHelper<TModel> helper,Expression<Func<TModel,TValue>> expression,dynamic htmlAttributes = null) { var attr = MergeAnonymous(new { @class = "form-control"},htmlAttributes); var editor = helper.EditorFor(expression,new { htmlAttributes = attr }); ... }
MergeAnonymous方法必须返回参数中收到的合并后的htmlAttributes,其中包含“new {@class =”form-control“}”:
static dynamic MergeAnonymous(dynamic obj1,dynamic obj2) { var dict1 = new RouteValueDictionary(obj1); if (obj2 != null) { var dict2 = new RouteValueDictionary(obj2); foreach (var pair in dict2) { dict1[pair.Key] = pair.Value; } } return dict1; }
在示例字段的编辑器模板中,我需要添加更多属性:
@model decimal? @{ var htmlAttributes = HtmlHelper.AnonymousObjectToHtmlAttributes(ViewData["htmlAttributes"]); htmlAttributes["class"] += " inputmask-decimal"; } @Html.TextBox("",string.Format("{0:c}",Model.ToString()),htmlAttributes)
我在编辑模板的最后一行的htmlAttributes中有的是:
请注意,“类”正确显示,但扩展助手的其他属性在字典中,我做错了什么?
如果可能的话,我想只更改Extension Helper而不是Editor Template,所以我认为传递给EditorFor的RouteValueDictionary需要转换为匿名对象…
解决方法
我解决了现在更改所有编辑器模板的问题:
var htmlAttributes = HtmlHelper.AnonymousObjectToHtmlAttributes(ViewData["htmlAttributes"]);
为了这:
var htmlAttributes = ViewData["htmlAttributes"] as IDictionary<string,object> ?? HtmlHelper.AnonymousObjectToHtmlAttributes(ViewData["htmlAttributes"]);
和MergeAnonymous方法:
static IDictionary<string,object> MergeAnonymous(object obj1,object obj2) { var dict1 = new RouteValueDictionary(obj1); var dict2 = new RouteValueDictionary(obj2); IDictionary<string,object> result = new Dictionary<string,object>(); foreach (var pair in dict1.Concat(dict2)) { result.Add(pair); } return result; }