Question

只是想知道如何用LINQ语法编写以下SQL

select * from COESDetails
where COESNo in
(select distinct COESNo from COESDefects)

Fluent或Query Expression，或两者

COESDefects具有COESDetails

的导航属性

public class COESDefects
{

    public int Id { get; set; }
    public int COESNo { get; set; }
    public string Comments { get; set; }       

    public virtual COESDetails COESDetails { get; set; }

}

public class COESDetails
{
    public COESDetails()
    {           
        COESDetailsCOESDefects = new List<COESDefects>();         
    }

    public int COESNo { get; set; }
    public int Postcode { get; set; }      
    public virtual ICollection<COESDefects> COESDetailsCOESDefects { get; set; }            
}

由于

Answer 1

试试这个：

var query =
    from x in context.COESDetails
    join y in context.COESDefects on x.COESNo equals y.COESNo into ys
    where ys.Any()
    select x;

Answer 2

我觉得它会像这样简单：

yourDbContext.COESDetails.Where(detail => detail.COESDetailsCOESDefects.Any()).ToList();

如果我错了，请纠正我。

Answer 3

有时，如果查询很复杂，直接执行它就会更容易，例如。

IEnumerable<COESDetails> myResults = dbConext.ExecuteQuery<CCOESDetails>("select * from COESDetails where COESNo in (select distinct COESNo from COESDefects)")

如何在LINQ语法中编写以下内容？

3 个答案: