如何从后台线程正确更新数据绑定 datagridview [英] How do you correctly update a databound datagridview from a background thread

问题描述

我有一个实现 INotifyPropertyChanged 的​​自定义对象.我有这些对象的集合，其中集合基于 BindingList我已经为集合创建了绑定源，并设置了绑定源和数据网格视图的数据源.

I have a custom object that implements INotifyPropertyChanged. I have a collection of these objects where the collection is based on BindingList I have created a binding source for the collection, and set the datasources of the bindingsource and datagridview.

一切都很好，除了我需要从后台线程更新自定义对象的属性.当我这样做时，我收到以下错误:

Everything works great, except I need to update properties on the custom object from background threads. when I do so, I get the following error :

BindingSource 不能是它自己的数据源.不要将 DataSource 和 DataMember 属性设置为引用回 BindingSource 的值

BindingSource cannot be its own data source. Do not set the DataSource and DataMember properties to values that refere back to BindingSource

我发现以下帖子似乎有我的确切问题(和解决方案?)，但我无法弄清楚.

I found the following post that seems to have my exact problem (and solution?) but I cannot quite figure it out.

http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols/thread/3566f7c7-eb47-422e-ab09-9549a18da360/

我根据业务对象中的帖子创建并初始化了 oper 变量，然后将两个事件函数放入我的集合类中.这编译正确，但运行时无一例外挂起.

I created and initialized the oper variables per the post in my business object, and then I put the two event functions into my collection class. This compiled correctly, but hangs without exception when run.

我看到很多帖子都说要使用 Invoke/Begin Invoke，但我没有在 UI 上调用任何函数，只是更新业务对象，所以我不确定将调用调用放在哪里.

I have seen many posts saying to use Invoke/Begin Invoke, but I am not calling any functions on the UI, just updating business objects, so I am not sure where I would put the invoke calls.

一个限制:我希望业务对象不知道谁在显示它(因为有多个消费者)所以将 GUI 引用发送到业务对象中，以便我以后能够使用这些引用调用 invoke选项.

One restriction : I want the business object to remain unaware of who is displaying it (as there are multiple consumers) so sending in GUI references into the business object so that I am later able to call invoke using those references is not an option.

推荐答案

我在一个有效的论坛中找到了这个课程.只需使用它而不是 BindingList

I found this class in a forum that works. Just use this instead of BindingList

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.ComponentModel;
using System.Threading;

namespace Utility
{
    public class ThreadedBindingList<T> : BindingList<T>
    {
        SynchronizationContext ctx = SynchronizationContext.Current;

        protected override void OnAddingNew(AddingNewEventArgs e)
        {

            if (ctx == null)
            {
                BaseAddingNew(e);
            }
            else
            {
                ctx.Send(delegate
                {
                    BaseAddingNew(e);
                }, null);
            }
        }
        void BaseAddingNew(AddingNewEventArgs e)
        {
            base.OnAddingNew(e);
        }
        protected override void OnListChanged(ListChangedEventArgs e)
        {
           // SynchronizationContext ctx = SynchronizationContext.Current;
            if (ctx == null)
            {
                BaseListChanged(e);
            }
            else
            {
                ctx.Send(delegate
                {
                    BaseListChanged(e);
                }, null);
            }
        }
        void BaseListChanged(ListChangedEventArgs e)
        {
            base.OnListChanged(e);
        }
    } 
}

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