你如何正确地更新从后台线程数据绑定的DataGridView [英] How do you correctly update a databound datagridview from a background thread

问题描述

我有实现INotifyPropertyChanged的自定义对象。我的这些对象的集合，其中所述集合是基于的BindingList
我创建了一个收集绑定源，并设置的BindingSource和DataGridView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.

一切都很正常，但我需要更新从后台线程自定义对象的属性。当我这样做，我得到以下错误：

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 :

的BindingSource不能是它自己的数据源。不要设置数据源和DataMember属性值的参考，回到BindingSource的

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

我发现下面的职位，似乎有我确切的问题（和解决方案？），但我不能完全看着办吧。

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

<一个href=\"http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols/thread/3566f7c7-eb47-422e-ab09-9549a18da360/\">http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols/thread/3566f7c7-eb47-422e-ab09-9549a18da360/

我创建，并在我的业务对象初始化每个职位的OPER变量，然后我把两个事件功能为我的集合类。这正确编译，但无一例外挂起时运行。

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.

我看过很多帖子说要使用调用/调用开始，但我不呼吁UI任何功能，只是更新业务对象，所以我不知道，我会把调用呼叫。

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：我想要的业务对象仍然不知道谁正在显示它的（因为有多个消费者）的GUI引用，这样发送到业务对象，这样我以后能够调用使用这些引用调用不是选项​​。

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

我在工作的论坛，发现这个类。只需用这个代替的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);
        }
    } 
}

这篇关于你如何正确地更新从后台线程数据绑定的DataGridView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！