在 WPF 中从另一个视图动态更改视图-解网

问：

我正在尝试制作登录和注册页面。当我进入登录页面并单击“注册”时，运行以将内容更改为注册页面，但它没有更改。知道为什么吗？ICommandContentControl

MainViewModel.cs:

using ShopWave.Core;
using ShopWave.MVVM.View;
using System;
using System.Windows.Controls;

namespace ShopWave.MVVM.ViewModel
{
  internal class MainViewModel : ObservableObject
  {
    public RelayCommand HomeViewCommand { get; private set; }
    public RelayCommand ServiceViewCommand { get; private set; }
    public RelayCommand ProductViewCommand { get; private set; }
    public RelayCommand SalesViewCommand { get; private set; }
    public RelayCommand LoginViewCommand { get; private set; }
    public RelayCommand RegisterViewCommand { get; private set; }
    public RelayCommand AccountViewCommand { get; private set; }

    public HomeViewModel HomeVM;
    public ServiceViewModel ServiceVM;
    public ProductViewModel ProductVM;
    public SalesViewModel SalesVM;
    public LoginViewModel LoginVM;
    public RegisterViewModel RegisterVM;
    public AccountViewModel AccountVM;

    private ServiceView service = new ServiceView();

    private object _currentView;

    public object CurrentView
    {
        get { return _currentView; }
        set
        {
            Console.WriteLine($"Old view: {_currentView}");
            _currentView = value;
            OnPropertyChanged();
            Console.WriteLine($"New view: {_currentView}");
        }
    }

    public MainViewModel()
    {
        HomeVM = new HomeViewModel();
        ServiceVM = new ServiceViewModel();
        ProductVM = new ProductViewModel();
        SalesVM = new SalesViewModel();
        LoginVM = new LoginViewModel();
        RegisterVM = new RegisterViewModel();
        AccountVM = new AccountViewModel();

        CurrentView = SalesVM;

        HomeViewCommand = new RelayCommand(o =>
        {
            CurrentView = HomeVM;
        });

        ServiceViewCommand = new RelayCommand(o =>
        {
            CurrentView = ServiceVM;
        });

        ProductViewCommand = new RelayCommand(o =>
        {
            CurrentView = ProductVM;
        });

        SalesViewCommand = new RelayCommand(o =>
        {
            CurrentView = SalesVM;
        });

        LoginViewCommand = new RelayCommand(o =>
        {
            CurrentView = LoginVM;
        });

        RegisterViewCommand = new RelayCommand(o =>
        {

            CurrentView = RegisterVM;
            Console.WriteLine("RegisterViewCommand Used!");
        });

        AccountViewCommand = new RelayCommand(o =>
        {
            CurrentView = AccountVM;
        });

    }
  }
}

LoginView.xaml:

<UserControl x:Class="ShopWave.MVVM.View.Login"
         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:ShopWave.MVVM.View"
         xmlns:viewModel="clr-namespace:ShopWave.MVVM.ViewModel"
        mc:Ignorable="d" 
         d:DesignHeight="450" d:DesignWidth="800">

<UserControl.DataContext>
    <viewModel:MainViewModel/>
</UserControl.DataContext>

<Border Background="#29303d"
        CornerRadius="20"
        Height="400"
        Width="300">
    <Grid>
        <Label Content="Login"
               Foreground="White"
               Height="47"
               FontWeight="Medium"
               FontSize="25"
               VerticalAlignment="Top"
               HorizontalAlignment="Center"
               Margin="0,5,0,0" Width="80"/>

        <Label Content="Email"
               Foreground="White"
               FontSize="22"
               Margin="50,102,150,260"/>

        <TextBox Width="200"
                 Height="30"
                 Background="#1f242e"
                 BorderThickness="0"
                 Margin="14,-100,0,0"
                 Foreground="White"
                 FontSize="14"
                 VerticalContentAlignment="Center"
                 HorizontalContentAlignment="Left"/>

        <Label Content="Password"
               Foreground="White"
               FontSize="22"
               Margin="50,178,110,185"/>

        <PasswordBox Width="200"
                 Height="30"
                 Background="#1f242e"
                 BorderThickness="0"
                 Margin="14,50,0,0"
                 Foreground="White"
                 FontSize="14"
                 PasswordChar="*"
                 VerticalContentAlignment="Center"
                 HorizontalContentAlignment="Left"/>

        <Border CornerRadius="10"
                Width="120"
                Height="50"
                Background="Transparent"
                Margin="0,180,0,0">

            <Button Width="120"
                    Height="50"
                    BorderThickness="0"
                    Background="#005ce6"
                    Content="Login"
                    Foreground="White"
                    FontSize="25"
                    FontWeight="Medium">

            </Button>
        </Border>

        <Button Background="Transparent"
                Content="Register"
                Foreground="#e6e6e6"
                Width="60"
                Height="25"
                FontSize="15"
                Margin="0,270,0,0"
                BorderThickness="0"
                VerticalContentAlignment="Center"
                HorizontalContentAlignment="Center"
                Click="Button2_Click" Command="{Binding RegisterViewCommand}"/>

    </Grid>
</Border>
</UserControl>

MainWindow.xaml:

<Window x:Class="ShopWave.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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:viewModel="clr-namespace:ShopWave.MVVM.ViewModel"
    xmlns:local="clr-namespace:ShopWave"
    mc:Ignorable="d"
    Height="800" Width="1120"
    Loaded="WindowLoaded"
    WindowStyle="None"
    AllowsTransparency="True"
    Background="Transparent"
    >

<Window.DataContext>
    <viewModel:MainViewModel/>
</Window.DataContext>

<Border Background="#1f242e"
        CornerRadius="20">
    <Grid>

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="168" />
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>

        <Grid.RowDefinitions>
            <RowDefinition Height="62" />
            <RowDefinition Height="489*"/>
        </Grid.RowDefinitions>

        <TextBlock Text="Shop Wave" 
                   VerticalAlignment="Center" 
                   HorizontalAlignment="Left"
                   Foreground="White"
                   FontSize="22"
                   Margin="20,0,0,0" Height="30" Width="109"/>

        <StackPanel Grid.Row="1">

            <RadioButton Content="Services"
                         Height="50"
                         Foreground="White"
                         FontSize="18"
                         Style="{StaticResource MenuButtonTheme}"
                         Command="{Binding ServiceViewCommand}"/>

            <RadioButton Content="Products"
                         Height="50"
                         Foreground="White"
                         FontSize="18"
                         Style="{StaticResource MenuButtonTheme}"
                         Command="{Binding ProductViewCommand}"/>

            <RadioButton Content="Sales"
                         Height="50"
                         Foreground="White"
                         FontSize="18"
                         IsChecked="True"
                         Style="{StaticResource MenuButtonTheme}"
                         Command="{Binding SalesViewCommand}"/>

            <RadioButton Content="Account"
                         Height="50"
                         Foreground="White"
                         FontSize="18"
                         Margin="0, 520"
                         Style="{StaticResource MenuButtonTheme}"
                         Command="{Binding LoginViewCommand}"/>
        </StackPanel>

        <TextBox Width="250"
                 VerticalContentAlignment="Center"
                 HorizontalAlignment="Left"
                 Margin="5,11,0,11"
                 Grid.Column="1"
                 Style="{StaticResource ModernTextBox}"/>

        <ContentControl Grid.Row="1"
                        Grid.Column="1"
                        Margin="10"
                        Content="{Binding CurrentView}">

        </ContentControl>

    </Grid>
</Border>
</Window>

RegisterView.xaml:

<UserControl x:Class="ShopWave.MVVM.View.RegisterView"
         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:ShopWave.MVVM.View"
         mc:Ignorable="d" 
         d:DesignHeight="450" d:DesignWidth="800">
<Border Background="#29303d"
        CornerRadius="20"
        Height="400"
        Width="300">
    <Grid>
        <Label Content="Register"
               Foreground="White"
               Height="47"
               FontWeight="Medium"
               FontSize="25"
               VerticalAlignment="Top"
               HorizontalAlignment="Center"
               Margin="0,5,0,0" 
               Width="105"
              />

        <RadioButton Content="Business"
                     Foreground="White"
                     FontSize="18"
                     VerticalAlignment="Center"
                     VerticalContentAlignment="Center"
                     HorizontalAlignment="Center"
                     HorizontalContentAlignment="Center"
                     Margin="0,-240,0,0"
                     x:Name="business"/>

        <Label Content="Username"
               Foreground="White"
               FontSize="22"
               Margin="50,102,143,260"/>

        <TextBox Width="200"
                 Height="30"
                 Background="#1f242e"
                 BorderThickness="0"
                 Margin="14,-100,0,0"
                 Foreground="White"
                 FontSize="14"
                 VerticalContentAlignment="Center"
                 HorizontalContentAlignment="Left"
                 x:Name="username"/>

        <Label Content="Email"
               Foreground="White"
               FontSize="22"
               Margin="50,162,150,196"/>

        <TextBox Width="200"
                 Height="30"
                 Background="#1f242e"
                 BorderThickness="0"
                 Margin="14,20,0,0"
                 Foreground="White"
                 FontSize="14"
                 VerticalContentAlignment="Center"
                 HorizontalContentAlignment="Left"
                 x:Name="email"/>

        <Label Content="Password"
               Foreground="White"
               FontSize="22"
               Margin="50,220,110,139"/>

        <PasswordBox Width="200"
                 Height="30"
                 Background="#1f242e"
                 BorderThickness="0"
                 Margin="14,140,0,0"
                 Foreground="White"
                 FontSize="14"
                 
                 PasswordChar="*"
                 VerticalContentAlignment="Center"
                 HorizontalContentAlignment="Left"
                 x:Name="password"/>

        <Border CornerRadius="10"
                Width="120"
                Height="50"
                Background="Transparent"
                Margin="0,240,0,0">

            <Button Width="120"
                    Height="50"
                    BorderThickness="0"
                    Background="#005ce6"
                    Content="Register"
                    Foreground="White"
                    FontSize="25"
                    FontWeight="Medium"
                    Click="Button_Click">

            </Button>
        </Border>

        <Button Background="Transparent"
                IsHitTestVisible="False"
                Content="Login"
                Foreground="#e6e6e6"
                Width="60"
                Height="25"
                FontSize="15"
                Margin="0,330,0,0"
                BorderThickness="0"
                VerticalContentAlignment="Center"
                HorizontalContentAlignment="Center"/>

    </Grid>
</Border>
</UserControl>

有谁知道为什么会这样？任何帮助都是值得赞赏的！

C# .net wpf xaml

0赞 Trevor 10/29/2023

CurrentView是一个对象，则您分配的是 ViewModel 实例，而不是视图。FWIW，查看数据模板并根据数据类型弹出视图，即：视图模型。

0赞 Andy 10/29/2023

您的登录名有自己的第二个 mainviewmodel 实例。删除此 <UserControl.DataContext> <viewModel：MainViewModel/> </UserControl.DataContext>

0赞 Andy 10/29/2023

您可能会发现这个有趣的 github.com/AndyONeill/LoginNavigation

答： 暂无答案

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