.net-4.0 - TPL - MaxDegreeOfParallelism 和 MaximumConcurrencyLevel 之间的区别

Question

ParallelOptions.MaxDegreeOfParallelism有什么区别和 ParallelOptions.TaskScheduler.MaximumConcurrencyLevel ?你什么时候用？

Answer 1

使用反射器，我收集到两者都用于 EffectiveMaxConcurrencyLevel属性(property):

internal int EffectiveMaxConcurrencyLevel
{
    get
    {
        int maxDegreeOfParallelism = this.MaxDegreeOfParallelism;
        int maximumConcurrencyLevel = this.EffectiveTaskScheduler.MaximumConcurrencyLevel;
        if ((maximumConcurrencyLevel > 0) && (maximumConcurrencyLevel != 0x7fffffff))
        {
            maxDegreeOfParallelism = (maxDegreeOfParallelism == -1) ? maximumConcurrencyLevel : Math.Min(maximumConcurrencyLevel, maxDegreeOfParallelism);
        }
        return maxDegreeOfParallelism;
    }
}