是否有类似于python针对linq的枚举

overload of Enumerable.Select Func<TSource, int, TResult> 要投影元素及其索引,请执行以下操作:

例如:

char[] letters = new[] { 'a', 'b', 'c' };
var enumerate = letters.Select((c, i) => new { Char = c, Index = i });
foreach (var result in enumerate) {
    Console.WriteLine(
        String.Format("Char = {0}, Index = {1}", result.Char, result.Index)
    );
}

输出:

Char = a, Index = 0
Char = b, Index = 1
Char = c, Index = 2

您可以使用超负荷的 Enumerable.Select 它提供了一个索引变量。这提供了对索引的访问,您可以使用该索引生成新的匿名类型。以下各项可正确编译和运行:

static void Main()
{

    var letters = new char[] { 'a', 'b', 'c' };
    var results = letters.Select((l, i) => new { Letter = l, Index = i });

    foreach (var result in results)
    {
        Console.WriteLine("{0} / {1}", result.Letter, result.Index);
    }
    Console.ReadKey();
}