Question

编译查询的.cs代码是

public static Func<DataClassesDataContext, int, IQueryable<editor_j_inf>>
editordetail1 = CompiledQuery.Compile((DataClassesDataContext db, int a) =>
             from p1 in db.editor_j_infs
             where p1.ed_journal_id == a
             orderby p1.editor_id descending
             select p1);   //Its my precompile process

如果我想在此编译器查询中的2个表之间进行内连接，我该怎么办

假设1个表名是editor_j_inf而另一个是editor_j_inf1。如何在这2个表之间进行内部联接

我试过把

 public static Func<DataClassesDataContext, string, int, int, IQueryable<A>>
  getjournal2 = CompiledQuery.Compile((DataClassesDataContext db, string a, int b, int c) =>
         from p in db.editor_j_infs
         join p1 in db.editor_regs on p.editor_id equals p1.editor_id
         where p.j_email == a && p1.confirm1 == b && p1.denied == c
         orderby p.ed_journal_id descending
         select new A{Title= p.j_title,EditorId= p.editor_id,EditorId1=p.ed_journal_id });


Public class A
{ 
    public string Title {get;set;} 
    public int EditorId {get;set;}
    public int EditorId1 { get; set;} 
}
 public void getjournals()
{
    string email="abc@gmail.com";    
    var rr1 = getjournal2(db, email,1,0).ToList();

    var rrlist = rr1.ToList();

    if (rrlist.Count() != 0)
    {
        DataList1.DataSource = rr1;
        DataList1.DataBind();
    }
}

现在如何使用datalist进行绑定？

Answer 1

试试这个： -

from p1 in db.editor_j_inf
join p2 in db.editor_j_inf1
on new { p1.ed_journal_id , p1.column2}
equals new { p2.ed_journal_id , p2.column2}
select p1.column1 + " " + p1.column2;

Answer 2

您需要使返回类型和实际返回对应。如果您需要string make Func<DataClassesDataContext, int, IQueryable<string>>

并使用

完成查询

select new {p.j_title}甚至是select p.j_title。如果您需要editor_j_inf，请按原样保留函数声明，并使用select p

完成查询

在linq中创建内部连接到sql（编译查询）

2 个答案: