爲什麼String.HtmlEncode無法識別？

Question

我得到以下錯誤消息

LINQ實體無法識別方法System.String HtmlEncode(System.String)方法，該方法不能 翻譯成商店表達。

使用這個LINQ的聲明

using (TranEntities model = new TranEntities()) 
{ 
     studentNames = (from source in model.Students 
         where source.Name.Contains(pre) 
         select System.Web.HttpUtility.HtmlEncode(source.Name.Replace(pre, "<span style='color : red'>" + pre + "</span>"))).ToList(); 
} 

Answer 1

你需要從LINQ到實體到步驟LINQ到對象，使用AsEnumerable方法，像這樣：

using (TranEntities model = new TranEntities()) 
{ 
    var studentNamesE = (from source in model.Students 
        where source.Name.Contains(pre) 
        select source).AsEnumerable(); 

    studentNames = (from source in studentNamesE 
        select System.Web.HttpUtility 
          .HtmlEncode(source.Name.Replace(pre, 
             "<span style='color : red'>" + pre + "</span>"))) 
       .ToList(); 
}