C#无限迭代

问题描述

C#中是否有与Java的Stream.iterate类似的东西?我能找到的最接近的东西是Enumerable.Range，但有很大的不同.

Is there anything similar in C# to Java's Stream.iterate? The closest thing I could find was Enumerable.Range but it is much different.

我问的原因是我一直在观看演示讲述了良好的编程原理，并且有一个关于声明式和命令式代码的线程.引起我注意的是一种可以生成伪无限数据集的方法.

The reason I'm asking is that I've been just watching some presentation about good programming principles and there was a thread about declarative vs. imperative code. What caught my attention was a way you can generate a pseudo-infinite set of data.

推荐答案

.Net框架中没有完全相同的等效项，但MoreLINQ库:

There isn't an exact equivalent in the .Net framework but there is one in the MoreLINQ library:

foreach (var current in MoreEnumerable.Generate(5, n => n + 2).Take(10))
{
    Console.WriteLine(current);
}

使用yield重新创建它也很简单:

It's also very simple to recreate it using yield:

public static IEnumerable<T> Iterate<T>(T seed, Func<T,T> unaryOperator)
{
    while (true)
    {
        yield return seed;
        seed = unaryOperator(seed);
    }
}

yield允许创建无限枚举器，因为:

yield enables to create an infinite enumerator because:

从收益(C#参考)

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