如何将sql多个LEFT JOIN转换为linq

【问题标题】：How to convert sql multimple LEFT JOIN to linq如何将sql多个LEFT JOIN转换为linq
【发布时间】：2016-11-22 11:30:04
【问题描述】：

我有下一个 SQL 查询：

SELECT Troox.*, Transfers.TranferDate, Users.UserName, Users_1.UserName 
FROM((Troox LEFT JOIN Transfers ON Troox.TrooxID = Transfers.TrooxID)
LEFT JOIN Users ON Transfers.SenderID = Users.UserId) 
LEFT JOIN Users AS Users_1 ON Transfers.ReceiverID = Users_1.UserId
where(Troox.UserId = 51)

我需要将此查询转换为 C# 中的 LINQ。

或者如何使用 Context.Database.SqlQuery 执行此操作，并获得响应。

请帮帮我。

【问题讨论】：

标签： c# mysql sql-server linq

【解决方案1】：

  internal class MappingData
 {
  public int TrooxID {get; set} // Here i declare only TrooxID  of Troox for sample,you can declare all of the fields  in Troox as  one by one
  public DateTime TranferDate{ get; set; }
  public string UserName{ get; set; }
  public string UserName1{ get; set; }

 }

using (var context = new MyDBContext())
 {
 var TrooxUserId= new SqlParameter("@TrooxUserId","51");
 string sqlQuery = @"SELECT Troox.TrooxID, Transfers.TranferDate, Users.UserName, Users_1.UserName as UserName1
                   FROM((Troox LEFT JOIN Transfers ON Troox.TrooxID = Transfers.TrooxID)
                   LEFT JOIN Users ON Transfers.SenderID = Users.UserId) 
                   LEFT JOIN Users AS Users_1 ON Transfers.ReceiverID = Users_1.UserId where Troox.UserId =@TrooxUserId";
 var Results = db.Database.SqlQuery<MappingData>(sqlQuery,TrooxUserId).ToList();
 }

【讨论】：