TPL - MaxDegreeOfParallelism和MaximumConcurrencyLevel之间的区别

Question

ParallelOptions.MaxDegreeOfParallelism和ParallelOptions.TaskScheduler.MaximumConcurrencyLevel之间有什么区别？你什么时候使用？

Answer 1

使用反射器，我收集到两者都在EffectiveMaxConcurrencyLevel属性中使用：

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;
    }
}