Question

我在WPF应用程序中有一个绑定ItemSource的DataGrid。当这个ItemSource收到更新时，每三秒钟，DataGrid上的排序就会被抛出。它接近我可以从我们的呼叫系统获得的实时馈送，因此需要每三秒更新一次。问题是如何在更新到达DataGrid之前让排序保持或重新应用，以便用户看不到它排序不正确。我在下面发布了一些代码，但不知道您可能需要哪些信息来帮助解决此问题。我整天都在和它斗争。

目标：目前代码程序对此列表进行排序。它如上所述工作三秒钟，但是以程序方式对其进行排序不是目标。我在这里因为我需要帮助弄清楚它为什么不能在数据网格上排序。我希望用户能够从长远来看将它们排序。每次更新项目来源时，我都需要停止离开。

代码背后：

private void textBlock_Loaded(object sender, RoutedEventArgs e)
        {
            FeedServiceAgent data = new FeedServiceAgent();

            data.MessageReceived += OnMessageReceived;
            data.Subscribe("92", 3);
        }

        private void OnMessageReceived(object sender, MessageReceivedEventArgs e)
        {
            try
            {
                List<NewAgent> newAgentList = new List<NewAgent>();
                if (e == null)
                    return;

                if (e.CmsData != null)
                {


                    Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)(() =>
                    {                                         
                        foreach (var item in e.CmsData.Agents)
                        {
                            NewAgent newAgents = new ScoreBoardClientTest.NewAgent();

                            newAgents.AgentName = item.AgName;

                            newAgents.AgentExtension = item.Extension;

                            newAgents.AgentDateTimeChange = ConvertedDateTimeUpdated;

                            newAgents.AuxReasons = item.AuxReasonDescription;

                            newAgents.LoginIdentifier = item.LoginId;

                            newAgents.AgentState = item.WorkModeDirectionDescription;

                            var timeSpanSince = DateTime.Now - item.DateTimeUpdated;
                            newAgents.AgentDateTimeStateChange = timeSpanSince;   

                            newAgentList.Add(newAgents);

                            ListCollectionView myListCollectionView = new ListCollectionView(newAgentList);

                            myListCollectionView.SortDescriptions.Add(new SortDescription("AgentState", ListSortDirection.Ascending));
                            myListCollectionView.SortDescriptions.Add(new SortDescription("AuxReasons", ListSortDirection.Descending));
                            myListCollectionView.SortDescriptions.Add(new SortDescription("AgentDateTimeStateChange", ListSortDirection.Descending));

                            DataGrid.ItemsSource = myListCollectionView;
                        }                                                                   
                    }));                    
                }
            }

XAML：

<DataGrid Name="DataGrid" AutoGenerateColumns="False" IsReadOnly="True" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch" ColumnWidth="*"  Foreground="Green" FontSize="10"   Loaded="textBlock_Loaded" Margin="0,10" RenderTransformOrigin="0.127,0.275" Background="{x:Null}" IsSynchronizedWithCurrentItem="False" GridLinesVisibility="Horizontal">
                <DataGrid.Columns>
                    <DataGridTextColumn Header="Name" Binding="{Binding AgentName}"  />
                    <DataGridTextColumn Header="State" Binding="{Binding AgentState}"  />
                    <DataGridTextColumn Header="Aux" Binding="{Binding AuxReasons}" />
                    <DataGridTextColumn Header="Time" Binding="{Binding AgentDateTimeStateChange, StringFormat={}{0:hh}:{0:mm}:{0:ss}}"/>                                          
                </DataGrid.Columns>
            </DataGrid>

列表对象的CS：

class NewAgent
    {
        public string AgentName { get; set; }
        public int AgentExtension { get; set; }
        public TimeSpan AgentDateTimeChange { get; set; }
        public TimeSpan AgentDateTimeStateChange { get; set; }
        public String AuxReasons { get; set; }
        public string LoginIdentifier { get; set; }
        public string AgentState { get; set; }

    }

Answer 1

我的解决方案（不优雅但应该有效） - 在设置新的ItemSource之前保存dataGrid.Items.SortDescriptions。

删除代码中您执行myListCollectionView.SortDescriptions.Add的行并尝试执行

var sorting = DataGrid.Items.SortDescriptions
       .Select(x => new {x.PropertyName, x.Direction}).ToList();

DataGrid.ItemsSource = myListCollectionView;

foreach (var item in sorting)
{
   var col = DataGrid.Columns
               .First(x => x.SortMemberPath == item.PropertyName);
   col.SortDirection = item.Direction;
   DataGrid.Items.SortDescriptions.Add(
         new SortDescription(item.PropertyName, item.Direction));
 };

每次itemource收到更新

1 个答案: