我可以安全地绑定到多线程应用程序上的数据吗？ [英] Can I safely bind to data on multi-threaded applications?

问题描述

我试图解决一个经典的问题 -
我有一个多线程应用程序，运行一些
处理器密集型计算，带有一个GUI界面。

I'm trying to solve a classic problem - I have a multi-threaded application which runs some processor-intensive calculations, with a GUI interface.

每当一个线程完成一个任务，我想要
更新表上的状态

Every time one of the threads has completed a task, I'd like to update a status on a table

taskID |状态

taskID | status

我以下列方式使用DataGridView和BindingList：

I use DataGridView and BindingList in the following way:

BindingList<Task> tasks;
dataGridView.DataSource = tasks

public class Task : INotifyPropertyChanged
{
    ID{get;}
    Status{get;set;}
}

后台线程可以安全地更新任务的状态吗？
和更改将以GUI中的正确顺序显示？

Can a background thread safely update a task's status? and changes will be seen in the correct order in the GUI?

第二个问题：
什么时候需要调用PropertyChanged？
我试着运行和没有通话，似乎没有打扰..

Second Question: When do I need to call to PropertyChanged? I tried running with and without the call, didn't seem to bother..

第三个问题：
我在MSDN上看到dataGridView使用BindingSource
作为DataGridView.DataSource和BindingList之间的调解器
这是真的有必要吗？

Third Question: I've seen on MSDN that dataGridView uses BindingSource as a mediator between DataGridView.DataSource and BindingList Is this really necessary?

推荐答案

1 - 否。在更新数据绑定属性之前，背景任务必须与UI线程同步。这可以通过使用计划到 TaskScheduler.FromCurrentSynchronizationContext 的任务完成。

1 - No. Background tasks must synchronize to the UI thread before updating databound properties. This can be done by using a Task scheduled to TaskScheduler.FromCurrentSynchronizationContext.

如果你还没有在.NET 4.0（例如，任务不可用），那么这取决于你的任务的运作方式：a使用完成概念的任务可以使用 BackgroundWorker ，无限期运行的任务可以使用 SynchronizationContext.Post 。

If you're not on .NET 4.0 yet (e.g., Task isn't available), then it depends on how your "tasks" operate: a task with the concept of "completion" can use BackgroundWorker, and a task that runs indefinitely can use SynchronizationContext.Post.

2 - PropertyChanged 被绑定用于更新其显示。不知道为什么它对你没有调用它...

2 - PropertyChanged is used by the binding to update its display. Not sure why it worked for you without calling it...

3 - BindingSource 提供各种功能;见什么是绑定源，为什么需要它？

3 - BindingSource provides various functionality; see What Is a BindingSource and Why Do I Need It?

BTW：欢迎您在SO上提出多个问题。这个问题应该是三个。

BTW: you're welcome to ask more than one question on SO. This one question should really be three.

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