c# - 区分多列 Entity Framework LINQ

Question

什么是 LINQ 等价于

Select DISTINCT A, B, C from TESTDB WHERE ALPHA =1

我正在尝试这样的事情:

var data = TESTDB.WHERE(i=>i.ALPHA==1).SELECT(A,B,C).DISTINCT();

Answer 1

使用匿名对象就可以了:

var data = TESTDB.Where(i => i.ALPHA == 1).Select(i => new {i.A, i.B, i.C}).Distinct();

保留模型:

List<Book> books = db.Book.Select(i => new Book {Author = i.Author, Title = i.Title}).Distinct().ToList();