blocks|key|379856|text|如果视图绑定到此集合，则不可能在单独的线程上修改ObservableCollection的内容，相反，您可以重写ObservableCollection并提供对它的支持，并在应用程序中使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|379857|此示例包含您想要的内容-+http://tomlev2.wordpress.com/2009/04/17/wpf-binding-to-an-asynchronous-collection/|offset|length|379858|entityMap|0|LINK|mutability|MUTABLE|url|http://tomlev2.wordpress.com/2009/04/17/wpf-binding-to-an-asynchronous-collection/^0|0|D|2A|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

It is not possible to modify the contents of an ObservableCollection on a separate thread if a view is bound to this collection, instead you can override ObservableCollection and provide support for it and use it across your application.

This sample contains exactly what you want - <a href="http://tomlev2.wordpress.com/2009/04/17/wpf-binding-to-an-asynchronous-collection/" rel="nofollow">http://tomlev2.wordpress.com/2009/04/17/wpf-binding-to-an-asynchronous-collection/</a>

blocks|key|2202388|text|当涉及到线程和ui元素时，最重要的规则之一是在ui线程上保持ui元素实例化(ui元素实例化)，这可能会给您带来长期的麻烦。你肯定能搞定的。如果需要从另一个线程更改这些对象，则可以使用Dispatcher。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2202389|(+http://msdn.microsoft.com/en-us/library/ms741870.aspx的引用也可能有意义)|offset|length|2202390|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms741870.aspx^0|0|2|1H|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

When it comes to threads and ui-elements one of the most important rules to follow which may safe you a lot of trouble in the long run is to keep ui-element instantiation on the ui-thread. Surely you can manage that. And if you need to change those objects from another thread you can use the Dispatcher.

(The <a href="http://msdn.microsoft.com/en-us/library/ms741870.aspx" rel="nofollow">threading model</a> reference may also be of interest)

blocks|key|177033|text|您可能需要检查您使用的是哪个Dispatcher？在您的例子中，您可能指的是两个不同的分配器。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|177034|为什么不使用线程安全可观察集呢？|177035|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/7687000/fast-performing-and-thread-safe-observable-collection/7687108#7687108^0|E|A|0|6|8|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@$9|T|A|U|1|V]]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

You may have to check which <code>Dispatcher</code> you are using? In your case you could be referring to two different dispatchers.

Also why not use <a href="https://stackoverflow.com/questions/7687000/fast-performing-and-thread-safe-observable-collection/7687108#7687108">thread safe observable collection</a>?

blocks|key|177037|text|通常，我将在UI线程上创建对象，然后用从后台线程获得的数据填充它们。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|177038|例如,|177039|void+async+LoadButton_Clicked(object+sender,+EventArgs+e)
{
++++MyCollection+=+new+ObservableCollection<SomeItem>();

++++//+Can+also+use+a+BackgroundWorker
++++var+collectionData+=+await+GetCollectionData();

++++foreach(var+item+in+collectionData)
++++{
++++++++MyCollection.Add(item);
++++}
}|code-block|syntax|javascript|177040|我使用C#+5.0+async和await关键字进行异步操作，但您也可以使用执行后台工作的BackgroundWorker。|offset|length|style|CODE|177041|您还可以使用Dispatcher.BeginInvoke()进行一些较轻的后台工作(例如将数据复制到MyCollection)，尽管对于繁重的工作，我发现它仍然会锁定UI，所以我更喜欢使用后台线程。|177042|entityMap^0|0|0|0|A|5|G|5|19|G|0|6|O|1E|C|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]|$K|Y|L|Z|M|N]|$K|10|L|11|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@$K|13|L|14|M|N]|$K|15|L|16|M|N]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$]]

Usually I will create the objects on my UI thread, then populate them with data obtained from a background thread.

For example,

<pre><code>void async LoadButton_Clicked(object sender, EventArgs e)
{
 MyCollection = new ObservableCollection&lt;SomeItem&gt;();

 // Can also use a BackgroundWorker
 var collectionData = await GetCollectionData();

 foreach(var item in collectionData)
 {
 MyCollection.Add(item);
 }
}
</code></pre>

I'm using C# 5.0 <code>async</code> and <code>await</code> keywords for asynchronous operations, but you can also use a <code>BackgroundWorker</code> that does your background work.

You can also use <code>Dispatcher.BeginInvoke()</code> for some lighter background work (such as copying data into <code>MyCollection</code>), although for heavy work I find it still locks up the UI so I prefer to use background threads.

blocks|key|2202496|text|谢谢大家的帮助..。一个来自MS的家伙为了做其他的事情而访问了公司(抱歉，商业注释)，我偷了他的东西，并展示了这种行为。两分钟内就能找到问题的根源.我不确定能真正理解。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2202497|碰巧，我使用一个ICollectionView来显示问题ObservableCollection的排序/过滤版本。我是在类的构造函数中创建这个ICollectionView的，因此在反序列化时它是在另一个线程中创建的。他建议将此创建移动到代码中的更长时间(当相关属性被读取时)。这解决了问题。|2202498|但是，在另一个线程中创建的ObservableCollection现在允许我添加新项。不知道为什么，但现在起作用了。|2202499|抱歉这么晚了，再次谢谢你。|2202500|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Thank you everyone for your help... a guy from MS visited the company (sorry for the commercial annotation) to do other things, I stoled him and show this behavior. In a matter of 2 minutes founds the source of the problem... which I'm not sure to really understand.

It happens that I'm using an ICollectionView to display a sorted/filtered version of my problematic ObservableCollection. I was creating this ICollectionView in the constructor of my class, so at the moment of deserialization it was created in another thread. He suggested to move this creation to a further time in code (when the related property gets read). This solved the problem.

However the ObservableCollection, created in that other thread, now lets me add new item. Not sure why, but now it works.

Sorry for being this late and thank you again.

I have this:

<ol>
<li>Shows a waiting animation to 'block' the UI while performs a loading operation in the background.</li>
<li>At the end of the loading I call a method that instances a User Control and displays some data by using Bindings (and ObservableCollection among others)</li>
<li>This User Control gets displayed and user can interact with it, however the ObservableCollection seems to be stuck in another thread as it doesn't allow to add new items to it.</li>
</ol>

I've tried to update the UI at the Completed event of a BackgroundWorker, using Dispatcher, using DispatchTimer... all of this displays the User Control, but the ObservableCollection stays of out reach for adding.

The code that tries to add items to the collection is inside the UserControl.

The exact error is: "This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread"

This does not happen if I don't do the loading in the background.

Thank you for any workaround for this.

<h2>By the way, trying to add the items using Dispatcher doesn't work either.</h2>

In other words, what I would like to do is to create an object in the UI Thread while being in the background... I know this may sounds silly.

UI update after background operation blocks binding on ObservableCollection

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有这个：显示在后台执行加载操作时等待“阻止”UI的动画。在加载结束时，我调用一个方法，该方法实例一个用户控件，并使用绑定(和ObservableCollection等)显示一些数据。这个用户控件将被显示，用户可以与它交互，但是ObservableCollection似乎被卡在另一个线程中，因为它不允许向它添加新的项。...

问在ObservableCollection上绑定后台操作块后的UI更新
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