Parallel與PLINQ簡單示例

2019-11-14 14:12:22

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Parallel是對Task用法的簡化，含有Parallel.For、Parallel.ForEach、Parallel.Invoke三個靜態方法。PLINQ是并行版本的LINQ。下面給出Parallel和PLINQ的簡單示例及注意事項。

一、簡單示例

1、Parallel.For

            int[] nums = new[] { 1, 2, 3, 4 };            Parallel.For(0, nums.Length, i =>            {                Console.WriteLine("下標：{0}，值：{1}", i, nums[i]);            });

2、Parallel.ForEach

            var ltModel = new List<UserInfo>();            for (int i = 1; i <= 5; i++)            {                var item = new UserInfo { No = i, Name = "名字" + i };                ltModel.Add(item);            }            Parallel.ForEach(ltModel, item =>            {                Console.WriteLine("No:{0}, Name:{1}", item.No, item.Name);            });

3、Parallel.Invoke

            var ltTask = new List<Action>();            for (int i = 1; i <= 5; i++)            {                int j = i;                ltTask.Add(() =>                {                    Console.WriteLine("啟動任務" + j);                });            }            Parallel.Invoke(ltTask.ToArray());

4、PLINQ

            var ltNum = new List<int>() {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};            var resultNum = (from n in ltNum.asparallel() where n>=3 orderby n descending select n).ToArray();            foreach (var item in resultNum)            {                Console.WriteLine("Num: {0}", item);               }