本文介绍了C#中的并行迭代?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
Is there a way to do foreach style iteration over parallel enumerables in C#? For subscriptable lists, I know one could use a regular for loop iterating an int over the index range, but I really prefer foreach to for for a number of reasons.
Bonus points if it works in C# 2.0
解决方案
Short answer, no. foreach works on only one enumerable at a time.
However, if you combine your parallel enumerables into a single one, you can foreach over the combined. I am not aware of any easy, built in method of doing this, but the following should work (though I have not tested it):
public IEnumerable<TSource[]> Combine<TSource>(params object[] sources)
{
foreach(var o in sources)
{
// Choose your own exception
if(!(o is IEnumerable<TSource>)) throw new Exception();
}
var enums =
sources.Select(s => ((IEnumerable<TSource>)s).GetEnumerator())
.ToArray();
while(enums.All(e => e.MoveNext()))
{
yield return enums.Select(e => e.Current).ToArray();
}
}
Then you can foreach over the returned enumerable:
foreach(var v in Combine(en1, en2, en3))
{
// Remembering that v is an array of the type contained in en1,
// en2 and en3.
}
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