这样试过了吗？
<UserControl x:Class="LayoutMVVM.Views.LinqView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:LayoutMVVM.Views"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
xmlns:veiwmodels="clr-namespace:LayoutMVVM.ViewModels.MojeDBModel"
xmlns:views="clr-namespace:LayoutMVVM.Views.MojeDBViews" >
<UserControl.Resources>
<DataTemplate DataType="{x:Type veiwmodels:UsersModel}">
<views:ViewUsersUserControl DataContext="{Binding}" />
</DataTemplate>
</UserControl.Resources>
<Grid Background="LemonChiffon">
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Menu " Height="32" Name="Menu" VerticalAlignment="Top">
<MenuItem Header="_Menu">
<MenuItem Header="Add User" Click="MenuItem_VU" />
</MenuItem>
</Menu>
<ContentControl Grid.Row="1" Content="{Binding UsersModel}"/>
</Grid>
</UserControl>
你的 C# 类应该是这样的，
public class MainViewModel
{
public UsersModel UsersModel {get;set;}
// other properties
}
然后在菜单中点击，
private void MenuItem_VU(object sender, RoutedEventArgs e)
{
DataContext = new MainViewModel();
}
我已删除 DataTemplate 上的密钥。
更新：
简单的工作示例，
MainWindow.cs
namespace WpfApplication29
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.DataContext = new MainViewModel();
}
}
public class MainViewModel : INotifyPropertyChanged
{
public LinqViewModel LinqModel
{
get; set;
} = new LinqViewModel();
public MainViewModel()
{
SelectedMainModel = LinqModel;
}
private object selectedModel;
public object SelectedMainModel
{
get
{
return selectedModel;
}
set
{
selectedModel = value;
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void Notify(string name)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
public class LinqViewModel : INotifyPropertyChanged
{
public UserModel UserModel
{
get; set;
} = new UserModel();
private object selectedChildModel;
public object SelectedChildModel
{
get
{
return selectedChildModel;
}
set
{
selectedChildModel = value;
Notify("SelectedChildModel");
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void Notify(string name)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
public class UserModel
{
}
}
MainWindow.xaml
<Window
x:Class="WpfApplication29.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WpfApplication29"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
Title="MainWindow"
Width="525"
Height="350"
mc:Ignorable="d">
<Window.Resources>
<DataTemplate DataType="{x:Type local:LinqViewModel}">
<local:LinqView />
</DataTemplate>
<DataTemplate DataType="{x:Type local:UserModel}">
<local:UserView />
</DataTemplate>
</Window.Resources>
<Grid>
<ContentControl Content="{Binding SelectedMainModel}" />
</Grid>
</Window>
用户用户控件
<UserControl
x:Class="WpfApplication29.UserView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WpfApplication29"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
d:DesignHeight="300"
d:DesignWidth="300"
mc:Ignorable="d">
<Grid >
<TextBlock Text="From UserView"/>
</Grid>
</UserControl>
LinqView 用户控件 xaml
<UserControl
x:Class="WpfApplication29.LinqView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WpfApplication29"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
d:DesignHeight="300"
d:DesignWidth="300"
mc:Ignorable="d">
<Grid Background="LemonChiffon">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Menu Height="32" Name="Menu" VerticalAlignment="Top">
<MenuItem Header="_Menu">
<MenuItem Header="Add User" Click="MenuItem_VU" />
</MenuItem>
</Menu>
<ContentControl Grid.Row="1" Content="{Binding SelectedChildModel}"/>
</Grid>
</UserControl>
Linqview 用户控件 cs
namespace WpfApplication29
{
/// <summary>
/// Interaction logic for LinqView.xaml
/// </summary>
public partial class LinqView : UserControl
{
public LinqView()
{
InitializeComponent();
}
private void MenuItem_VU(object sender, RoutedEventArgs e)
{
(this.DataContext as LinqViewModel).SelectedChildModel = (this.DataContext as LinqViewModel).UserModel;
}
}
}
此示例遵循多级层次结构。希望这会有所帮助。