的Parallel.For步长 [英] Parallel.For step size

问题描述

没有人知道是否有任何的过载，让我来指定一个的Parallel.For循环的步长？在C＃或VB.Net样品将是巨大的。

does anyone know if there's any overload that would allow me to specify a step size in a Parallel.For loop? Samples in either c# or VB.Net would be great.

谢谢，伊

推荐答案

谷歌enumerable.range一步，你应该能够临到Enumerable.Range的提供加强的范围替代实现。然后，你可以做一个

Google for "enumerable.range step" and you should be able to come upon alternate implementations of Enumerable.Range that provide stepped ranges. Then you can just do a

Parallel.ForEach(BetterEnumerable.SteppedRange(fromInclusive, toExclusive, step), ...)

如果谷歌不工作，实现应该是这样的：

If google isn't working, implementation should be something like this:

public static class BetterEnumerable {
    public static IEnumerable<int> SteppedRange(int fromInclusive, int toExclusive, int step) {
        for (var i = fromInclusive; i < toExclusive; i += step) {
            yield return i;
        }
    }
}

另外，如果收益回报给出一个heebie jeebies，你总是可以只创建一个普通的老名单就地：

Alternately if "yield return" gives one the heebie jeebies, you can always just create a regular old list in-place:

var list = new List<int>();
for (int i = fromInclusive; i < toExclusive; i += step) {
    list.Add(i);
}
Parallel.ForEach(list, ...);

这应该很容易翻译到VB，如果这是必需的。

This should be easily translatable to VB if that's a requirement.

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