在WPF应用程序中，我使用的是MVVM Light和Fody。在我的View模型中，我有一个字典public Dictionary<string, string> OtherParticipants { get; set; }。在我的XAML中有一行：
<ListBox Height="350" HorizontalAlignment="Right" Margin="0,0,50,15"
Name="participantsListBox" VerticalAlignment="Center"
Width="170" SelectionMode="Single"
ItemsSource="{Binding OtherParticipants}"
SelectedItem="{Binding SelectedParticipant}" DisplayMemberPath="Value"/>
在我的View模型中，我调用了一个方法：
private void NewMessagesReceivedHandler(Dictionary<string, List<BaseMessageDto>> result)
{
var targetItems = OtherParticipants.Where(p => result.Keys.Any(n => p.Key == n)).ToList();
var dialogueTarget = SelectedParticipant.Value;
var dictItem = OtherParticipants.FirstOrDefault(i => i.Value == dialogueTarget);
if (targetItems.Contains(dictItem))
{
//there is an open dialogue with this user
//Dialogue.AddRange(result[dialogueTarget]);
result[dialogueTarget].ForEach(m => Dialogue.Add(m));
targetItems.Remove(dictItem);
}
for (int i = 0; i < targetItems.Count(); i++)
{
var participantKey = targetItems[i].Key;
var participantNameWithNum = targetItems[i].Value;
var incomingMessagesCount = result[participantKey].Count;
if (_usernameWithNotificationsCountRegex.IsMatch(participantNameWithNum))
{
var matches = _usernameWithNotificationsCountRegex.Matches(participantNameWithNum)[0];
var realUser = matches.Groups[1].Value;
var currentMessagesCount = Convert.ToInt32(matches.Groups[3].Value);
var total = currentMessagesCount + incomingMessagesCount;
OtherParticipants[participantKey] = realUser + " (" + total + ")";
}
else
{
OtherParticipants[participantKey] = participantNameWithNum + " (" + incomingMessagesCount + ")";
}
}
}
Method主体并不真正相关，其背后的想法确实会改变OtherParticipants字典的内容。问题是这个更改没有反映在我的ListBox中。欢迎任何想法。
附注：我正在使用Fody，因此我的所有VM都标有[ImplementPropertyChanged]属性
编辑：评论中链接的ObservableDictionary的当前实现不起作用