WPF 应用程序中的 ListView 数据不会刷新
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ListView Data Won't Refresh in WPF App
提问by Brodie
I am trying to load data into a ListView in WPF using a Stored Procedure and Entity Framework. When I first load the User Control the ListView loads the data just fine. I then call the same code to refresh the data and I can see through debugging that the ListItems count changes but the data on the front end screen does not update.
我正在尝试使用存储过程和实体框架将数据加载到 WPF 中的 ListView。当我第一次加载用户控件时，ListView 加载数据就好了。然后我调用相同的代码来刷新数据，我可以通过调试看到 ListItems 计数发生变化，但前端屏幕上的数据没有更新。
XAML
XAML
<ListView Name="DocsListView" ItemsSource="{Binding}">
<ListView.View>
<GridView>
<GridViewColumn Header="Documents" DisplayMemberBinding="{Binding Documents}"/>
</GridView>
</ListView.View>
</ListView>
Code Behind
背后的代码
public void LoadDocs()
{
Context _Context = new Context();
DocsListView.ItemsSource = null;
DocsListView.ItemsSource = _Context.SP_GetDocuments(1).ToList();
_Context = null;
}
Can someone please help me figure out what I'm doing wrong? I'm using VS2012, .Net 4.5, and EF 5.0.
有人可以帮我弄清楚我做错了什么吗？我使用的是 VS2012、.Net 4.5 和 EF 5.0。
采纳答案by makim
I′m not sure whats causing the Problem, generally I would recommend to use a DependencyProperty!
我不确定是什么导致了问题，通常我会建议使用 DependencyProperty！
But you could try to refresh the ListView like that:
但是您可以尝试像这样刷新 ListView：
ICollectionView view = CollectionViewSource.GetDefaultView(DocsListView.ItemsSource);
view.Refresh();
If this is going to be a bigger Project I strongly recommend to have a look at the MVVM DesignPattern!
如果这将是一个更大的项目，我强烈建议您查看 MVVM DesignPattern！
WPF and MVVMplay well together. There are nice Libraries you can use like MVVMLight.
WPF 和 MVVM 配合得很好。您可以使用一些不错的库，例如MVVMLight。
Also you should have a look at the INotifyPropertyChanged Interface.
你也应该看看INotifyPropertyChanged Interface。
XAML-Code (Don′t forget to set the DataContext)
XAML-Code（不要忘记设置DataContext）
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
DataContext="{Binding RelativeSource={RelativeSource Self}}">
<Grid>
<ListView Name="DocsListView" ItemsSource="{Binding Data}">
<ListView.View>
<GridView>
<GridViewColumn Header="Documents" DisplayMemberBinding="{Binding Documents}"/>
</GridView>
</ListView.View>
</ListView>
</Grid>
</Window>
C# Code-Behind (ObservableCollection refreshes the UI automatically if a Item gets added or deleted):
C# 代码隐藏（如果添加或删除项目，ObservableCollection 会自动刷新 UI）：
public ObservableCollection<YourEntity> Data
{
get { return (ObservableCollection<YourEntity>)GetValue(DataProperty); }
set { SetValue(DataProperty, value); }
}
// Using a DependencyProperty as the backing store for Data. This enables animation, styling, binding, etc...
public static readonly DependencyProperty DataProperty =
DependencyProperty.Register("Data", typeof(ObservableCollection<YourEntity>), typeof(MainWindow), null);
public void LoadDocs()
{
Context _Context = new Context();
if(Data == null)
{
Data = new ObservableCollection<YourEntity>();
}
else
{
Data.Clear();
}
foreach(var doc in _Context.SP_GetDocuments(1).ToList())
{
Data.Add(doc);
}
_Context = null;
}
