0

我的代码：

 ObservableCollection<SampleCheckedData> interestrates = new ObservableCollection<SampleCheckedData>();
 XDocument xmlDocu = XDocument.Load(new MemoryStream(System.Text.UTF8Encoding.UTF8.GetBytes(result)));

                interestrates = (from rts in xmlDocu.Descendants("Friend")

                                 select new SampleCheckedData
                                 {

                                     Id = (string)rts.Element("userid"),
                                     Name = (string)rts.Element("name"),
                                     Icon = (string)rts.Element("imageurl"),
                                     VisibleStatus = (string)rts.Element("visiblestatus"),
                                     AppStatus = (string)rts.Element("loginstatus"),

                                     imgBubble =bitmapRed,
                                 }).ToList<SampleCheckedData>();

然后出现错误，因为不能像这样将 system.collection.generic.list 隐式转换为 system.collection.observablecollection。如何使用可观察集合绑定列表框项？

编辑：

Button b = sender as Button;
                    var res = interestrates.Where(a => a.Id.Equals(((System.Windows.FrameworkElement)(e.OriginalSource)).Tag)).ToList();
                    if (res.Count == 1)
                        interestrates.Remove(res.First());
                    interestrates = new ObservableCollection<SampleCheckedData>();
                    lstFriendRequuest.ItemsSource = "";
                    bindGetFriends();

这里成功地从列表中删除项目，但是在调用 bindGetFriends() 新绑定项目之后，我没有得到新项目得到旧项目。为什么服务返回旧项目列表？

4

2 回答 2

3

使用这个扩展：

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

public static class Extensions
{
    public static ObservableCollection<T> ToObservableCollection<T>(this IEnumerable<T> collection)
    {
        var observableCollection = new ObservableCollection<T>();
        foreach (var item in collection) observableCollection.Add(item);
        return observableCollection;
    }
}

用法：

interestrates = (from rts in xmlDocu.Descendants("Friend") 
    select new SampleCheckedData
    {    
        Id = (string)rts.Element("userid"),
        Name = (string)rts.Element("name"),
        Icon = (string)rts.Element("imageurl"),
        VisibleStatus = (string)rts.Element("visiblestatus"),
        AppStatus = (string)rts.Element("loginstatus"),    
        imgBubble =bitmapRed,
    }).ToObservableCollection<SampleCheckedData>();
于 2012-06-12T10:35:51.280 回答
1

将您的 Observable 集合更改为 List，

List<SampleCheckedData> interestrates = new List<SampleCheckedData>();

您还可以将 List 绑定到 ListBox，而不是 ObservableCollection

要解决从列表框中删除所选项目的其他问题，请尝试以下代码：

 var selectedIndex = listbox.SelectedIndex;
 var listItems = listbox.ItemsSource as List<SampleCheckedData>;
 listItems.RemoveAt(selectedIndex);
 listbox.ItemsSource = null;
 listbox.ItemsSource = listItems;

如果您仍然面临问题，请告诉我

于 2012-06-12T10:13:10.903 回答