如何在 C# Zip 中组合两个以上的通用列表? [英] How to combine more than two generic lists in C# Zip?

问题描述

我有三个(可能有超过 3-4 个通用列表，但在本例中让 3 个)通用列表.

I have three (it's possible to have more than 3-4 generic list, but in this example let 3) generic lists.

List<string> list1

List<string> list2

List<string> list3

所有列表都具有相同数量的元素(相同的计数).

all lists have same number of elements (same counts).

我用它来将两个列表与 ZIP 结合起来:

I used that for combining two lists with ZIP :

var result = list1.Zip(list2, (a, b) => new {
  test1 = f,
  test2 = b
}

我将其用于 foreach 语句，以避免 foreach 每个 List，例如

I used that for foreach statement, to avoid foreach each List, like

foreach(var item in result){
Console.WriteLine(item.test1 + " " + item.test2);
}

如何将 simmilary 与 Zip 用于三个列表?

How to use simmilary with Zip for three lists ?

谢谢

我想要:

List<string> list1 = new List<string>{"test", "otherTest"};

List<string> list2 = new List<string>{"item", "otherItem"};

List<string> list3 = new List<string>{"value", "otherValue"};

ZIP后(我不知道方法)，我想要结果(在VS2010调试模式下)

after ZIP (I don't know method), I want to result (in VS2010 debug mode)

[0] { a = {"test"},
      b = {"item"},
      c = {"value"}
    }   

[1] { a = {"otherTest"},
      b = {"otherItem"},
      c = {"otherValue"}
    }  

怎么做?

推荐答案

对我来说最明显的方法是使用 Zip 两次.

The most obvious way for me would be to use Zip twice.

例如

var results = l1.Zip(l2, (x, y) => x + y).Zip(l3, (x, y) => x + y);

将组合(添加)三个 List 对象的元素.

would combine (add) the elements of three List<int> objects.

更新:

您可以定义一个新的扩展方法，它的作用类似于带有三个 IEnumerable 的 Zip，如下所示:

You could define a new extension method that acts like a Zip with three IEnumerables, like so:

public static class MyFunkyExtensions
{
    public static IEnumerable<TResult> ZipThree<T1, T2, T3, TResult>(
        this IEnumerable<T1> source,
        IEnumerable<T2> second,
        IEnumerable<T3> third,
        Func<T1, T2, T3, TResult> func)
    {
        using (var e1 = source.GetEnumerator())
        using (var e2 = second.GetEnumerator())
        using (var e3 = third.GetEnumerator())
        {
            while (e1.MoveNext() && e2.MoveNext() && e3.MoveNext())
                yield return func(e1.Current, e2.Current, e3.Current);
        }
    }
}

用法(在与上述相同的上下文中)现在变为:

The usage (in the same context as above) now becomes:

var results = l1.ZipThree(l2, l3, (x, y, z) => x + y + z);

同样，您现在可以将三个列表组合在一起:

Similarly, you three lists can now be combined with:

var results = list1.ZipThree(list2, list3, (a, b, c) => new { a, b, c });

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