How can I do a Union all in Entity Framework LINQ To Entities?

问题

I came across a scenario where I had to use Union all, how can I achieve so in LINQ to entities ?

回答1:

Here is the answer you are looking for. Use the Concat keyword.

From the example:

var query = (from x in db.Table1 select new {A = x.A, B = x.B})
    .Concat( from y in db.Table2 select new {A = y.A, B = y.B} );

回答2:

I believe Concat is what you're looking for.

var allResults = resultSet1.Concat(resultSet2);

Obviously, both result sets must use the same type. And I believe there my be other requirements about how the result sets are constructed in the first place, but I don't know all the details.

来源：https://stackoverflow.com/questions/9828308/how-can-i-do-a-union-all-in-entity-framework-linq-to-entities