将Linq查询转换为列表时出错

Question

这是我的代码。我想将这个列表保存在一个会话变量中以供稍后进行身份验证（这是用户有权访问的对象列表....）我收到一个错误消息，说它不能将System.Collections.Generic.List隐式转换为“System”。 collections.Generic.List。帮帮我？

protected void Session_Start(object sender, EventArgs e) 
    { 
     string strUserName = User.Identity.Name; 
     string strShortUserName = strUserName.Replace("WINNTDOM\\", string.Empty).ToUpper(); 
     System.Web.HttpContext.Current.Session["strShortUserName"] = strShortUserName; 
     System.Web.HttpContext.Current.Session["strUserName"] = strUserName; 
     List<string> authorizedObjects = new List<string>(); 
     using (CPASEntities ctx = new CPASEntities()) 
     { 
      var w = (from t in ctx.tblUsers 
        where (t.UserPassword == strUserName) 
        select t).FirstOrDefault(); 
      if (!(w==null)) 
      { 
       authorizedObjects = (from t in ctx.qryUserObjectAuthorization 
             where (t.UserPassword == strUserName) 
             select new { n = t.ObjectName }).ToList(); 

      } 
     } 
    } 

Answer 1

要生成的字符串列表使用

authorizedObjects = (from t in ctx.qryUserObjectAuthorization 
        where (t.UserPassword == strUserName) 
        select t.ObjectName).ToList(); 

Answer 2

authorizedObjects是List<string>但你想用它作为匿名类型的列表：

List<string> authorizedObjects = new List<string>(); 

（...）

authorizedObjects = (from t in ctx.qryUserObjectAuthorization 
        where (t.UserPassword == strUserName) 
        select new { n = t.ObjectName, i = t.ObjectID }).ToList() 

更改查询到：

authorizedObjects = (from t in ctx.qryUserObjectAuthorization 
        where (t.UserPassword == strUserName) 
        select t.ObjectName).ToList() 

Answer 3

您正在初始化一个List<string>对象，但填充了不同的对象。

List<string> authorizedObjects = new List<string>(); 

select new { n = t.ObjectName, i = t.ObjectID } <--construct a class with these properties and initialize `List<WithNewClassName>`