1
// 定义我们自己要用的类型
2
class QWQ
3
{
4
    public int qwq;
5
    public string awa;
6
    public QWQ(){}
7
    public QWQ(int qwq){this.qwq=qwq;}
8
}
9
// 用来执行的方法
10
static void LinqExTest()
11
{
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    List<QWQ> qwqs = Enumerable.Range(0, 10).Select(v => new QWQ(v)).ToList();
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    // 在迭代的同时, 对原对象进行更改:
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    qwqs.Select(v => v.awa = v.qwq.ToString());
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    // 打印对象
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    Console.WriteLine(string.Join("\n", qwqs.Select(v => $"qwq:{v.qwq}, awa:{v.awa}")));
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}

1
qwq:0, awa:
2
qwq:1, awa:
3
qwq:2, awa:
4
qwq:3, awa:
5
qwq:4, awa:
6
qwq:5, awa:
7
qwq:6, awa:
8
qwq:7, awa:
9
qwq:8, awa:
10
qwq:9, awa:

1
qwqs.Select((v, i) => qwqs[i].awa = v.qwq.ToString());

1
qwq:0, awa:
2
qwq:1, awa:
3
qwq:2, awa:
4
qwq:3, awa:
5
qwq:4, awa:
6
qwq:5, awa:
7
qwq:6, awa:
8
qwq:7, awa:
9
qwq:8, awa:
10
qwq:9, awa:

1
foreach(var v in qwqs)
2
    v.awa = v.qwq.ToString();

1
qwq:0, awa:0
2
qwq:1, awa:1
3
qwq:2, awa:2
4
qwq:3, awa:3
5
qwq:4, awa:4
6
qwq:5, awa:5
7
qwq:6, awa:6
8
qwq:7, awa:7
9
qwq:8, awa:8
10
qwq:9, awa:9