69 lines
1.2 KiB
C#
69 lines
1.2 KiB
C#
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
|
|
class DataA
|
|
{
|
|
public int Key;
|
|
public string Text;
|
|
}
|
|
|
|
class DataB
|
|
{
|
|
public int Key;
|
|
public string Value;
|
|
}
|
|
|
|
class GroupJoin
|
|
{
|
|
public static int Main ()
|
|
{
|
|
DataA[] d1 = new DataA[] { new DataA () { Key = 1, Text = "Foo" }};
|
|
DataB[] d2 = new DataB[] { new DataB () { Key = 2, Value = "Second" }};
|
|
|
|
var e = from a in d1
|
|
join b in d2 on a.Key equals b.Key into ab
|
|
from x in ab.DefaultIfEmpty ()
|
|
select new { a = x == default (DataB) ? "<empty>" : x.Value, b = a.Text };
|
|
|
|
var res = e.ToList ();
|
|
if (res.Count != 1)
|
|
return 1;
|
|
|
|
if (res [0].a != "<empty>")
|
|
return 2;
|
|
|
|
if (res [0].b != "Foo")
|
|
return 3;
|
|
|
|
// Explicitly typed
|
|
e = from a in d1
|
|
join DataB b in d2 on a.Key equals b.Key into ab
|
|
from x in ab.DefaultIfEmpty ()
|
|
select new { a = x == default (DataB) ? "<empty>" : x.Value, b = a.Text };
|
|
|
|
foreach (var o in e)
|
|
Console.WriteLine (o);
|
|
|
|
res = e.ToList ();
|
|
if (res.Count != 1)
|
|
return 10;
|
|
|
|
if (res [0].a != "<empty>")
|
|
return 11;
|
|
|
|
if (res [0].b != "Foo")
|
|
return 12;
|
|
|
|
var e2 = from a in d1
|
|
join a in d2 on a.Key equals a.Key into ab
|
|
select a;
|
|
|
|
Console.WriteLine ("OK");
|
|
return 0;
|
|
}
|
|
}
|
|
|