为什么String.HtmlEncode无法识别？

Question

我得到以下错误消息

LINQ实体无法识别方法System.String HtmlEncode(System.String)方法，该方法不能 翻译成商店表达。

使用这个LINQ的声明

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

你需要从LINQ到实体到步骤LINQ到对象，使用AsEnumerable方法，像这样：

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(); 
}