显示的组合框项目未更新
我对组合框中的项目列表有疑问。当项目源重新加载(从文件)时,它们不会更新
WPF 看起来像这样:
<DockPanel x:Name="Dock_Profil" DataContext="{Binding Profile, UpdateSourceTrigger=PropertyChanged,NotifyOnSourceUpdated= True}">
<StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
<ComboBox Margin="5" Width="200" ItemsSource="{Binding}" DisplayMemberPath="ProfilName" IsSynchronizedWithCurrentItem="True"
x:Name="cmbProfil" SelectedIndex="0" ></ComboBox>
<Button Margin="5">
<StackPanel Orientation="Horizontal" >
<Image Margin="2" Stretch="None" Source="/MEC_EDINeu;component/Resources/Add24.png" />
<Label>Neues Profil</Label>
</StackPanel>
</Button>
</StackPanel>
属性配置文件是这种类型:
Public Class EDIProfile
Inherits ObservableCollection(Of EDIProfil)
在某些时候,我需要重新加载配置文件的内容,因此
Profile.Load()
OnPropertyChanged("Profile")
被称为。 (OnPropertyChanged 在 ViewModelBase.vb 中实现并传递给 MainWindowViewModel)
当我随后在 MainWindow.xaml.vb 中使用以下命令进行检查时:
For Each item As EDIProfil In cmbProfil.Items
MsgBox(item.ProfilName & "__" & item.lastFA)
Next
正确的项目位于其中。
但 GUI 中的组合框仍然显示旧内容。
我发现的解决方法(但我不想将其用于所有组合框): 如果我(在 mainwindow.xaml.vb 中)使用该行:
cmbProfil.Items.Refresh()
组合框显示的项目的更新有效(但不应该绑定到该行吗?)
我对 WPF 很陌生,希望在这里获得一些帮助。
预先感谢
当我在 MainWindowViewModel 中加载数据时(无论如何这是正确的方法吗?):
Public Sub loadProfile()
'Profile.Load()
Profile.Clear()
Dim xmls As XmlSerializer = New XmlSerializer(GetType(EDIProfile))
Dim reader As New StreamReader(System.Reflection.Assembly.GetExecutingAssembly().Location.Substring(0, System.Reflection.Assembly.GetExecutingAssembly().Location.LastIndexOf("\") + 1) & "EDIProfile.xml")
Dim temp As New EDIProfile
' MsgBox("KK")
temp = xmls.Deserialize(reader)
For Each item As EDIProfil In temp
Profile.Add(item)
Next
reader.Close()
OnPropertyChanged("Profile")
End Sub
它有效
I have a problem with the List of Items in a combobox. They dont update when the itemsource is reloaded (from a file)
The WPF looks like this:
<DockPanel x:Name="Dock_Profil" DataContext="{Binding Profile, UpdateSourceTrigger=PropertyChanged,NotifyOnSourceUpdated= True}">
<StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
<ComboBox Margin="5" Width="200" ItemsSource="{Binding}" DisplayMemberPath="ProfilName" IsSynchronizedWithCurrentItem="True"
x:Name="cmbProfil" SelectedIndex="0" ></ComboBox>
<Button Margin="5">
<StackPanel Orientation="Horizontal" >
<Image Margin="2" Stretch="None" Source="/MEC_EDINeu;component/Resources/Add24.png" />
<Label>Neues Profil</Label>
</StackPanel>
</Button>
</StackPanel>
The Property Profile is this type:
Public Class EDIProfile
Inherits ObservableCollection(Of EDIProfil)
At certain points i need to reload the Content of Profile so
Profile.Load()
OnPropertyChanged("Profile")
is called. (OnPropertyChanged is implemented in the ViewModelBase.vb and passed on to MainWindowViewModel)
When i check afterwards in the MainWindow.xaml.vb using:
For Each item As EDIProfil In cmbProfil.Items
MsgBox(item.ProfilName & "__" & item.lastFA)
Next
the correct items are in there.
But the combobox in GUI still shows the old content.
A Workaround i found (but i dont want to use that for all comboboxes):
if i (in mainwindow.xaml.vb) use that line:
cmbProfil.Items.Refresh()
the update of the items displayed by the combobox work (but shouldnt the binding to that?)
I am pretty new to WPF, hoping to get some help here.
Thanks in advance
When I load the data in MainWindowViewModel (is that the correct way to do it anyway?):
Public Sub loadProfile()
'Profile.Load()
Profile.Clear()
Dim xmls As XmlSerializer = New XmlSerializer(GetType(EDIProfile))
Dim reader As New StreamReader(System.Reflection.Assembly.GetExecutingAssembly().Location.Substring(0, System.Reflection.Assembly.GetExecutingAssembly().Location.LastIndexOf("\") + 1) & "EDIProfile.xml")
Dim temp As New EDIProfile
' MsgBox("KK")
temp = xmls.Deserialize(reader)
For Each item As EDIProfil In temp
Profile.Add(item)
Next
reader.Close()
OnPropertyChanged("Profile")
End Sub
It works
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试试这个...删除您的 DataContext 绑定并将 ItemsSource 直接绑定到
Profile
。Try this ... remove your DataContext binding and bind ItemsSource directly to
Profile
.