如何从其他线程添加/更新列表视图 [英] How to add/update a listview from a different thread

问题描述

我目前有一种方法可以帮助对自定义项目列表进行排序，然后清除并批量添加更新列表到列表视图。

I currently have a method that helps sort a list of custom items and then clears and mass adds the updated list to a listview.

方法如下所示：

        public static void ReLoadLST(bool CanSort, bool UpD, ListView Lst, List<Item> I)
        {
            Lst.Items.Clear();
            int index = 0;
            List<Item> AddList = new List<Item>();

            if (CanSort && Sort && SearchView.SortBY.Count > 0)
            {
                try
                {
                    List<Item> LvL1 = new List<Item>();
                    List<int> UnSotr = new List<int>();
                    List<int> ASotr = new List<int>();
                    List<int> NullSotr = new List<int>();
                    foreach (KeyValuePair<string, string> r in SearchView.SortBY)
                    {
                        try
                        {
                            bool g = SearchView.PassState[r.Key];
                            if (g)
                            {
                                if (MutiSel.Contains(r.Value))
                                    UnSotr.AddRange(Item.ListNameTag[r.Value][r.Key]);
                                else ASotr = ASotr.Commons(Item.ListNameTag[r.Value][r.Key]);
                            }
                            else NullSotr.AddRange(Item.ListNameTag[r.Value][r.Key]);
                        }
                        catch { }
                    }
                    UnSotr = UnSotr.Condense();
                    ASotr = ASotr.Condense();
                    List<int> Pass = ASotr.Commons(UnSotr);
                    SortedDictionary<int, Item> tem = Lists.AllList;
                    if (Pass.Count == 0) Pass = tem.Keys.ToList();
                    Pass = Pass.RemoveRange(NullSotr);
                    Pass = Pass.Condense();
                    //List<int> SeriesAdd = new List<int>();
                    if (Item.CurrentDetailsMode == Item.DetailsMode.FinStatus)
                    {
                        foreach (int x in Pass)
                        {
                            try
                            {
                                Item i = tem[x];
                                if (!i.InSeries) AddList.Add(i);
                            }
                            catch { }
                        }
                    }
                    else foreach (int x in Pass)
                            if (x >= 0) try { AddList.Add(tem[x]); } catch { }
                }
                catch { }
            }
            else AddList = I;
            AddList = AddList.CleanEmtpySeries();
            AddList = AddList.SortBy_KnownName();

            foreach (Item x in AddList)
            {
                if (SearchText)
                {
                    string nam = x.KnownName.Trim().RemoveAccents().ToLower();
                    string ser = SearchView.SearchText.Trim().RemoveAccents().ToLower();
                    if (!(nam.Contains(ser) || nam == ser))
                        continue;
                }

                Item.Itm i = x.LSTItem;
                ListViewItem d = new ListViewItem();
                d.Content = i;
                d.Background = x.BackColor.ToBrush();
                d.Foreground = x.ForeColor.ToBrush();
                d.Tag = x;
                Lst.Items.Add(d);
                if (UpD) x.LSTItemIndex = index;
                index++;
            }
        }

如何在不同的线程中运行此方法？

How do I run this method in a different thread?

推荐答案

Ui控件具有线程关联性，您可以使用调度程序与ui线程进行通信，但是您需要运行与ui上的listview或listviewitem交互的代码。

Ui controls have thread affinity, you can use the dispatcher to talk to the ui thread but you need to run code that interacts with a listview or listviewitem on the ui.

Application.Current.Dispatcher.InvokeAsync(new Action(() =>
{
    // Do something with UI
}));

如果使用mvvm，你可以绑定一个observablecollection来自viewmodel。

If you used mvvm you could bind an observablecollection from a viewmodel.

然后你可以在一个单独的线程上处理你的绑定数据。

You could then do stuff with your bound data on a separate thread.

一旦你完成，强制ui重读你的界限使用更改通知收集或刷新收集视图。

Once you finish, force the ui to re read your bound collection using change notification or refresh a collectionview.

这篇关于如何从其他线程添加/更新列表视图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！