將Linq查詢轉換爲列表時出錯

Question

這是我的代碼。我想將這個列表保存在一個會話變量中以供稍後進行身份驗證（這是用戶有權訪問的對象列表....）我收到一個錯誤消息，說它不能將System.Collections.Generic.List隱式轉換爲「System」。 collections.Generic.List。幫幫我？

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>但你想用它作爲匿名類型的列表：

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() 

更改查詢到：

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

Answer 3

您正在初始化一個List<string>對象，但填充了不同的對象。

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

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