我在我的WPF应用程序中有以下代码,但在更改下拉列表中的值时没有看到任何用户控件内容。您能建议我错过了什么吗?用户控件内容不呈现
MainWindow.xaml:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:MainViewModel="clr-namespace:Test.ViewModel"
xmlns:ViewModel="clr-namespace:Test.ViewModel.AccountTypes"
xmlns:View="clr-namespace:Test.View" x:Class="Test.MainWindow"
xmlns:Views="clr-namespace:Test.View.AccountTypes"
xmlns:v="clr-namespace:Test.View.AccountTypes"
xmlns:vm="clr-namespace:Test.ViewModel.AccountTypes"
Title="{Binding DisplayName, Mode=OneWay}" ResizeMode="CanResize" WindowStartupLocation="CenterScreen">
<Window.DataContext>
<MainViewModel:MainWindowViewModel/>
</Window.DataContext>
<Grid>
<StackPanel Grid.Row="0" HorizontalAlignment="Left" VerticalAlignment="Top" Orientation="Horizontal" Height="28" Width="auto" Margin="5,0,0,0">
<ComboBox Width="360" Margin="1,0" ItemsSource="{Binding AccountTypes}" DisplayMemberPath="Code" SelectedValuePath="ID" SelectedItem="{Binding SelectedAccountType, Mode=TwoWay}" TabIndex="0" />
</StackPanel>
<ContentPresenter Content="{Binding CurrentViewModel}">
<ContentPresenter.Resources>
<DataTemplate DataType="{x:Type ViewModel:AC1ViewModel}">
<Views:AC1View/>
</DataTemplate>
<DataTemplate DataType="{x:Type ViewModel:AC2ViewModel}">
<Views:AC2View/>
</DataTemplate>
</ContentPresenter.Resources>
</ContentPresenter>
</Grid>
MainWindowViewModel.cs
public object CurrentViewModel
{
get { return m_currentViewModel; }
set
{
m_currentViewModel = value;
OnPropertyChanged("CurrentViewModel");
}
}
public AccountType SelectedAccountType
{
get
{
return m_selectedSearchAccountType;
}
set
{
m_selectedSearchAccountType = value;
if (SelectedAccountType.Code == "AC1")
{
m_currentViewModel = new AC1ViewModel();
}
else if (SelectedAccountType.Code == "AC2")
{
m_currentViewModel = new AC2ViewModel();
}
}
}
感谢。
你设置'CurrentViewModel'财产通过它的制定者?否则,不会调用“OnPropertyChanged”。 – user2697817
很难确定你在做什么。它看起来有些错误简化了你的代码 - m_currentViewModel没有被声明。这与_CurrentViewModel相同吗?或者CurrentViewModel属性?或者是别的什么? –