如何使用LINQ to SQL执行交叉联接?
发布于 2012-07-09 21:13:16
Linq扩展方法SelectMany
(lambda语法)也是如此:
var names = new string[] { "Ana", "Raz", "John" };
var numbers = new int[] { 1, 2, 3 };
var newList=names.SelectMany(
x => numbers,
(y, z) => { return y + z + " test "; });
foreach (var item in newList)
{
Console.WriteLine(item);
}
发布于 2009-03-24 20:43:21
根据Steve的回答,最简单的表达式是:
var combo = from Person in people
from Car in cars
select new {Person, Car};
发布于 2013-09-22 05:37:17
对于笛卡尔产品,Tuple
是一种很好的类型:
public static IEnumerable<Tuple<T1, T2>> CrossJoin<T1, T2>(IEnumerable<T1> sequence1, IEnumerable<T2> sequence2)
{
return sequence1.SelectMany(t1 => sequence2.Select(t2 => Tuple.Create(t1, t2)));
}
https://stackoverflow.com/questions/56547
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