創建自定義幫手Asp.net MVC 3

Question

我想創建一個自定義asp.net mvc3幫手。

要使用該助手，我應該寫的語法像下面

@Html.DisplayMyCustomHelper(model => model.FullName) 

期望輸出

Full Name (Value Picked from model's Display attribute)= Current Value Of Property 

如：

public Class User 
{ 
     [Display(Name="Full Name")] 
     public string FullName{get;set;} 
} 

User = new User{FullName="Tom Cruise"}; 

裏面剃刀

@model User 
@Html.DisplayMyCustomHelper(model => model.FullName) 

預期輸出

全名=湯姆·克魯斯

---

我怎樣才能做到這一點？

Answer 1

public static MvcHtmlString DisplayMyCustomHelper<TModel, TValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TValue>> expression) 
    { 
     const string format = "{0} = {1}"; 

     var metadata = ModelMetadata.FromLambdaExpression<TModel, TValue>(expression, htmlHelper.ViewData); 

     var model = metadata.Model; 

     var result = string.Format(format, metadata.DisplayName, model == null ? string.Empty : model.ToString()); 

     return MvcHtmlString.Create(result); 
    }