并行任务无法正常工作 [英] Parallel Task Not working properly

问题描述

当我运行此代码并且Parallel == true时，所有任务都会访问一个任务的属性，因为它们是静态的，因此运行的所有任务都将访问相同的proberties并且程序将崩溃。

When I run this code and Parallel == true all tasks access the properties of one task as they are static, so all the tasks that run will access the same proberties and the program will crash.

private List<BackupTask> backupTasks = new List<BackupTask>();

public void RunBackup()
        {
            if (Parallel == false)
            {
                foreach (var item in backupTasks)
                {
                    item.RunBackup();
                }
            }
            else
            {
                List<Task> tasks = new List<Task>();
                foreach (var item in backupTasks)
                {
                    var t = Task.Factory.StartNew(() =>
                    {
                        item.RunBackup();
                    });
                    tasks.Add(t);
                }
                Task.WaitAll(tasks.ToArray());
            }
        }

推荐答案

使用 lock statement [ ^ ] - 链接包含示例。

Use the lock statement[^] - the link includes examples.

public void RunBackup()
        {
            if (Parallel == false)
            {
                foreach (var item in backupTasks)
                {
                    item.RunBackup();
                }
            }
            else
            {
                //List<Task> tasks = new List<Task>();
                //foreach (var item in backupTasks)
                //{
                //    var t = Task.Factory.StartNew(() =>
                //    {
                //        item.RunBackup();
                //    });
                //    tasks.Add(t);
                //}
                //Task.WaitAll(tasks.ToArray());
                var tasks = new Task[backupTasks.Count];
                for (var i = 0; i < backupTasks.Count; i++)
                {
                    var x = i;
                    tasks[i] = Task.Factory.StartNew(() => backupTasks[x].RunBackup());
                }
                Task.WaitAll(tasks);
            }
        }

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