如何使 ObservableCollection 线程安全? [英] How to make ObservableCollection thread-safe?

问题描述

System.InvalidOperationException: Collection was modified; enumeration operation may not execute.

我正在添加/删除不在 UI 线程上的 ObservableCollection.

I am adding/removing from an ObservableCollection which is not on a UI thread.

我有一个名为 EnqueueReport 的方法可以添加到集合中，还有一个 DequeueReport 可以从集合中移除.

I have a method names EnqueueReport to add to the colleciton and a DequeueReport to remove from the colleciton.

步骤流程如下:-

1. 1. 每当请求新报告时调用 EnqueueReport
2. 每隔几秒调用一个方法来检查报告是否生成(这有一个 foreach 循环，用于检查 ObservableCollection 中所有报告的生成状态)
3. 如果生成报告，则调用 DequeueReport

我对 C# 库的了解不多.有人可以指导我吗?

I am not much in C# libraries. Can someone please guide me on this?

推荐答案

您可以创建可观察集合的简单线程友好版本.像下面这样:

You can create a simple thread friendly version of the observable collection. Like the following :

 public class MTObservableCollection<T> : ObservableCollection<T>
    {
        public override event NotifyCollectionChangedEventHandler CollectionChanged;
        protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
        {
            NotifyCollectionChangedEventHandler CollectionChanged = this.CollectionChanged;
            if (CollectionChanged != null)
                foreach (NotifyCollectionChangedEventHandler nh in CollectionChanged.GetInvocationList())
                {
                    DispatcherObject dispObj = nh.Target as DispatcherObject;
                    if (dispObj != null)
                    {
                        Dispatcher dispatcher = dispObj.Dispatcher;
                        if (dispatcher != null && !dispatcher.CheckAccess())
                        {
                            dispatcher.BeginInvoke(
                                (Action)(() => nh.Invoke(this,
                                    new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset))),
                                DispatcherPriority.DataBind);
                            continue;
                        }
                    }
                    nh.Invoke(this, e);
                }
        }
    }

现在做一个大规模的发现 &将您所有的 ObservableCollection 替换并更改为 MTObservableCollection 并祝您好运

with that now do a massive find & replace and change all your ObservableCollection to MTObservableCollection and your good to go

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