Question

我有以下Linq，我认为它在语法上是正确的。

 var result = from t1 in context.t1
              join t2 in context.t2
              on new { t1.field1, t1.field2 } equals new { t2.field1, t2.field2 }
              select new { t1, t2 };

但是我收到以下错误：

CS1941 The type of one of the expressions in the join clause is incorrect.  Type inference failed in the call to 'Join'.

在检查数据库时，我发现了以下内容：

table1                  |   table2
                        |
field1      varchar(16) |   field1  varchar(50)
field2      varchar(30) |   field2  varchar(50)

字段数据类型和长度是否匹配？

Answer 1

       Can you please try this .


       var result = from x in entity
         join y in entity2
         on new { X1= x.field1, X2= x.field2 } equals new { X1=y.field1, X2= y.field2 }
         select new 
         {
           /// Columns
          };

C＃Linq - 连接具有多个字段的表的问题 - 错误CS1941

1 个答案: