wpf MVVM ObservableCollection;不更新视图

发布于 2024-11-07 08:12:25 字数 1203 浏览 14 评论 0原文

我遇到的问题是我的 ObservableCollection 没有更新视图。我可以在 OnPropertyChange 之前放置一个断点，并可以验证我的集合中是否包含名称。

在我的模型中，我有一个事件会触发一个包含随机名称的列表。

在我的视图模型中，我订阅了此事件，并且我的事件处理程序执行此操作，

void _manager_ProcessesChanged(List<string> n)
    {
        //create a new collection to hold current Ids
        ObservableCollection<string> names = new ObservableCollection<string>();

        //copy ids into our collection
        foreach (string name in n)
        {
            names.Add(name);
        }

        Names = names;
    }

我的 Names 属性看起来像这样

ObservableCollection<string> _names = new ObservableCollection<string>();
public ObservableCollection<string> Names
    {
        get { return _names; }
        set
        {
            _names = value;
           OnPropertyChanged("Names");
        }
    }

，我的视图绑定看起来像这样

<Window.DataContext>
    <vm:MainWindowViewModel/>
</Window.DataContext>
<Grid>
    <ListBox ItemsSource="{Binding Path=Names}"/>
</Grid>

如果我将的集合更改为 < ;int> 它似乎工作正常..我错过了什么？

原文

I am having an issue where my ObservableCollection is not updating the view. I can place a breakpoint prior to the OnPropertyChange and can verify that my collection has the names in them.

In my model i have a event that fires a List with random names in it.

in my view model i subscribe to this event and my event handler does this

void _manager_ProcessesChanged(List<string> n)
    {
        //create a new collection to hold current Ids
        ObservableCollection<string> names = new ObservableCollection<string>();

        //copy ids into our collection
        foreach (string name in n)
        {
            names.Add(name);
        }

        Names = names;
    }

my Names property looks like so

ObservableCollection<string> _names = new ObservableCollection<string>();
public ObservableCollection<string> Names
    {
        get { return _names; }
        set
        {
            _names = value;
           OnPropertyChanged("Names");
        }
    }

and my view binds looks like this

<Window.DataContext>
    <vm:MainWindowViewModel/>
</Window.DataContext>
<Grid>
    <ListBox ItemsSource="{Binding Path=Names}"/>
</Grid>

If i change the collection for <string> to <int> it seems to work fine.. what am i missing?

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勿忘初心 2024-11-14 08:12:25

如果您重新实例化 ObservableCollection，您将失去与该集合的绑定。

您应该 .Clear(...) 和 .Add(...) 项目，并且您还应该将 ObservableCollection Names 更改为自动属性。无需在此处调用 OnPropertyChanged，因为它是由类型为您处理的。

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缱倦旧时光 2024-11-14 08:12:25

我也遇到过这个。不确定这是否是理想的解决方案（当然看起来不是）但这对我有用

void _manager_ProcessesChanged(List<string> n)
{
    Names.Clear();

    //copy ids into our collection
    foreach (string name in n)
    {
        Names.Add(name);
    }
}

I've run into this as well. Not sure if this is the ideal solution (sure doesn't seem like it) but this has worked for me

void _manager_ProcessesChanged(List<string> n)
{
    Names.Clear();

    //copy ids into our collection
    foreach (string name in n)
    {
        Names.Add(name);
    }
}

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~没有更多了~