C# 你能用 LINQ 组合多个列表吗？
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Can you combine multiple lists with LINQ?
提问by Cameron MacFarland
Say I have two lists:
假设我有两个列表：
var list1 = new int[] {1, 2, 3};
var list2 = new string[] {"a", "b", "c"};
Is it possible to write a LINQ statement that will generate the following list:
是否可以编写将生成以下列表的 LINQ 语句：
var result = new []{
new {i = 1, s = "a"},
new {i = 1, s = "b"},
new {i = 1, s = "c"},
new {i = 2, s = "a"},
new {i = 2, s = "b"},
new {i = 2, s = "c"},
new {i = 3, s = "a"},
new {i = 3, s = "b"},
new {i = 3, s = "c"}
};
?
?
Edit: I forgot to mention I didn't want it in query syntax. Anyway, based on preetsangha's answer I've got the following:
编辑：我忘了提到我不想在查询语法中使用它。无论如何，根据 preetsangha 的回答，我得到了以下信息：
var result = list1.SelectMany(i => list2.Select(s => new {i = i, s = s}));
采纳答案by Jon Skeet
preetsangha's answer is entirely correct, but if you don't want a query expression then it's:
preetsangha 的答案是完全正确的，但如果您不想要查询表达式，那么它是：
var result = list1.SelectMany(l1 => list2, (l1, l2) => new { i = l1, s = l2} );
(That's what the compiler compiles the query expression into - they're identical.)
（这就是编译器将查询表达式编译成的内容 - 它们是相同的。）
回答by Preet Sangha
var result = from l1 in list1
from l2 in list2
select new { i = l1, s = l2};
