linq to sql Distinct and orderby

var result = table1.Join(table2, o => o.ProgramID, t => t.ProgramID, (o, t) => new { o.ProgramID, t.Program }) .OrderBy(t => t.Program) .Distinct(); 

上面的linq语句实际上返回了正确的结果,但是他生成的sql(下面)并不是那么简单

 SELECT [t2].[ProgramID], [t2].[Program] FROM ( SELECT DISTINCT [t0].[ProgramID], [t1].[Program] FROM [table1] AS [t0] INNER JOIN [table2] AS [t1] ON [t0].[ProgramID] = [t1].[ProgramID] ) AS [t2] ORDER BY [t2].[Program] 

我原本以为下面的sql更清晰,但我不确定实现它的linq语句。

 select distinct o.ProgramID, t.Program from table1 0 inner join table2 t on t.ProgramID = o.ProgramID order by t.Program 

提前致谢

我不知道它是否会有所帮助,但你可以尝试这样的事情;

 var result = (from o in table1 join t in table2 on o.ProgramID equals t.ProgramID orderby t.Program select new { o.ProgramID, t.Program }).Distinct(); 

我试过这个并且有效:

 var result = (from o in table1 join t in table2 on o.ProgramID equals t.ProgramID select new { o.ProgramID, t.Program }) .Distinct().OrderBy(t => t.Program) .ThenBy(t => t.ProgramName) .ThenBy(t => t.Description); 

首先你做Distinct然后OrderBy,然后OrderBy工作。

描述两个查询,比较stats-IO和实际执行计划。 它完全有可能与SQL服务器没有区别。

如果您真的想要已知的TSQL,请使用ExecuteQuery-of-T并自行传递TSQL。 也许包括一些锁定提示(最常见的是:NOLOCK)