是AsParallel().ForAll可靠的

本文介绍了是AsParallel().ForAll可靠的的处理方法，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

我用AsParallel()查询.对于我来说，ForAll有时会跳过一些记录，有时会返回空记录.

I have query with AsParallel().ForAll is sometimes skipping some records and sometimes returning null records in my case.

我不确定这是确切原因.中的域名解析机制是否可靠?

I am not sure for this is the exact reason for this. Is the mechanism for parellal for in .Net reliable?

示例代码

var collection=.. Collection from database var processedCollection=... collection.Where(h => h.Id == id).AsParallel().ForAll(h => { var processedCollectionItem = ....logic to process the item processedCollectionItem.Where(c=>c.....).AsParallel().ForAll(c => { //logic to process the records }); processedCollection.Add(processedCollectionItem); });

推荐答案

与其在并行循环中向集合中添加内容，不如让框架来处理构建集合.

Instead of adding stuff to a collection in a parallel loop, it would probably be better to let the framework handle building the collection.

示例:

var processedCollection = collection .Where(h => h.Id == id) .AsParallel() .Select(h => ProcessItem(h)) .ToArray();

在ProcessItem中，将进行处理.并行执行此操作似乎是不必要的.

In ProcessItem the processing would occur. Doing that in parallel seems unnecessary.