C＃WPF MVVM切换视图

时间：2019-02-05 18:47:51

标签： c# wpf mvvm

嗨，我最近两天一直在找，但是我没有办法解决问题。

这是我的mainView

MainView.xaml 

<Window x:Class="STARename.MainView"
        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:vm="clr-namespace:PL.STARename.ViewModels"
        xmlns:views="clr-namespace:PL.STARename.Views"
        xmlns:local="clr-namespace:STARename"
        mc:Ignorable="d"
        Title="{Binding Path=Title}" Height="650" Width="825" WindowStartupLocation="CenterScreen">
    <Window.DataContext>
        <vm:MainViewModel />
    </Window.DataContext>
    <Window.Resources>
        <DataTemplate DataType="{x:Type vm:LoginViewModel}">
            <views:LoginView />
        </DataTemplate>

        <DataTemplate DataType="{x:Type vm:STARViewModel}">
            <views:STARView />
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="109*"/>
            <ColumnDefinition Width="166*"/>
            <ColumnDefinition Width="228*"/>
            <ColumnDefinition Width="213*"/>
            <ColumnDefinition Width="101*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="56*"/>
            <RowDefinition Height="484*"/>
            <RowDefinition Height="79*"/>
        </Grid.RowDefinitions>
        <Image Source="{Binding ContiLogo}" Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" />
        <TextBlock Text="{Binding Path=Title}" Grid.Column="2" FontWeight="Bold" FontFamily="Engravers MT" FontSize="24" VerticalAlignment="Center" HorizontalAlignment="Center" />
        <ContentControl Content="{Binding CurrentViewModel}" Grid.Column="1" Grid.Row="1" Grid.ColumnSpan="3" />
    </Grid>
</Window>

LoginView.xaml 

<UserControl x:Class="PL.STARename.Views.LoginView"
        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:vm="clr-namespace:PL.STARename.ViewModels"
        xmlns:local="clr-namespace:PL.STARename.Views"
        mc:Ignorable="d"
        Height="567.771" Width="518.51">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="80*"/>
            <ColumnDefinition Width="344*"/>
            <ColumnDefinition Width="87*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="98*"/>
            <RowDefinition Height="230*"/>
            <RowDefinition Height="209*"/>
        </Grid.RowDefinitions>
        <GroupBox x:Name="groupBox" Header="Login" Grid.Column="1" Grid.Row="1" BorderBrush="Orange">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="18*"/>
                    <ColumnDefinition Width="92*"/>
                    <ColumnDefinition Width="23*"/>
                    <ColumnDefinition Width="70*"/>
                    <ColumnDefinition Width="109*"/>
                    <ColumnDefinition Width="20*"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="81*"/>
                    <RowDefinition Height="35*"/>
                    <RowDefinition Height="12*"/>
                    <RowDefinition Height="32*"/>
                    <RowDefinition Height="44*"/>
                    <RowDefinition Height="4*"/>
                </Grid.RowDefinitions>
                <Image Source="{Binding ContiLogo}" Grid.ColumnSpan="4" />
                <TextBlock Text="User:" Grid.Column="1" Grid.Row="1" />
                <TextBlock Text="Password:" Grid.Column="1" Grid.Row="3" />
                <TextBox Text="{Binding Path=Username, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Grid.Column="3" Grid.Row="1" Grid.ColumnSpan="2" />
                <PasswordBox Grid.Column="3" Grid.Row="3" x:Name="PasswordBox" vm:PassAssist.BindPassword="True" vm:PassAssist.BoundPassword="{Binding Path=Password, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Grid.ColumnSpan="2">
                    <PasswordBox.InputBindings>
                        <KeyBinding Key="Enter" Command="{Binding CmdLogin}" />
                    </PasswordBox.InputBindings>
                </PasswordBox>
                <Button Background="Orange" Content="Login" Grid.Column="1" Grid.Row="4" Command="{Binding CmdLogin}" />
                <TextBlock Text="{Binding Path=LoginText,Mode=TwoWay}" Grid.Column="3" Grid.ColumnSpan="2" Grid.Row="4" />
            </Grid>
        </GroupBox>

    </Grid>
</UserControl>

STARView.xaml 

<UserControl x:Class="PL.STARename.Views.STARView"
             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:PL.STARename.Views"
             xmlns:vm="clr-namespace:PL.STARename.ViewModels"
             mc:Ignorable="d"
             Height="567.771" Width="518.51">
    <Grid>
        <TextBlock Text="STAR" />
    </Grid>
</UserControl>

BaseViewModel.cs 

 #region Variables         
        public string Title
        {
            get
            {
                return $"{Settings.Default.AppName} {Settings.Default.AppVersion}";
            }
        }
        public string ContiLogo
        {
            get
            {
                return $@"{Environment.CurrentDirectory}/Others/ContiLogo.png";
            }
        }

        protected virtual void SetProperty<T>(ref T member, T val,
         [CallerMemberName] string propertyName = null)
        {
            if (object.Equals(member, val)) return;

            member = val;
            OnPropertyChanged(propertyName);
        }

        public event PropertyChangedEventHandler PropertyChanged;
        #endregion
        protected void OnPropertyChanged(string propertyName)
        {
            VerifyPropertyName(propertyName);
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        [Conditional("DEBUG")]
        private void VerifyPropertyName(string propertyName)
        {
            if (TypeDescriptor.GetProperties(this)[propertyName] == null)
                throw new ArgumentNullException(GetType().Name + " does not contain property: " + propertyName);
        }
        public BaseViewModel()
        {
            //Helpers.BusLayer._BL;
            try
            {
                Helpers.BusLayer._BL.InitorReset();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

MainViewModel.cs 

public class MainViewModel : BaseViewModel
    {
        #region Variables
        public LoginViewModel LoginVM;
        public STARViewModel STARVM;
        private BaseViewModel _currentVM;
        public BaseViewModel CurrentViewModel
        {
            get
            {
                return _currentVM;
            }
            set
            {
                if (_currentVM == value)
                    return;
                _currentVM = value;
                OnPropertyChanged("CurrentViewModel");
            }
        }
        #endregion
        public MainViewModel()
        {
            LoginVM = new LoginViewModel();
            STARVM = new STARViewModel();
            if (!Helpers.BusLayer.LoginSuccess)
                CurrentViewModel = LoginVM;
            else
                CurrentViewModel = STARVM;
        }

    }

当我的登录名为true时，请输入LoginViewmodel，我想将View更改为STARView / ViewModel，但是View并没有更改。

LoginViewModel.cs 

  #region Variables
        private ICommand _cmdLogin;
        public ICommand CmdLogin
        {
            get
            {
                return _cmdLogin ?? (_cmdLogin = new CommandHandler(Login, canLogin));
            }
        }

        private string _loginText;
        public string LoginText
        {
            get
            {
                return _loginText;
            }
            set
            {
                _loginText = value;
                OnPropertyChanged("LoginText");
            }
        }
        private string _username;
        public string Username
        {
            get
            {
                return _username;
            }     
            set
            {
                _username = value;
                OnPropertyChanged("Username");                                                        
            }   
        }
        private string _password;
        public string Password
        {
            get
            {
                return _password;
            }
            set
            {
                _password = value;
                OnPropertyChanged("Password");
            }
        }
        #endregion

        public LoginViewModel()
        {
            //ViewModel = STARVM;
        }
        private void Login(object o)
        {
            LoginText = "";            
            try
            {
                if (Helpers.BusLayer._BL.Login(Username, Password))
                {
                    Helpers.BusLayer.LoginSuccess = true;
                    MainViewModel mainVM = new MainViewModel();                    
                    LoginText = "Ok!";                
                }
                else
                {
                    Password = "";
                    LoginText = "Username or password incorrect";
                }
            }
            catch (Exception ex)
            {
                Password = "";
                LoginText = ex.Message;
            }
        }
        private bool canLogin(object o)
        {
            return !string.IsNullOrWhiteSpace(Password) && !string.IsNullOrWhiteSpace(Username);
        }

STARViewModel.cs 

public STARViewModel()
        {

        }

登录为true时。 我想更改我的视图，但是它不这样做。

有帮助的想法吗？

0 个答案:

没有答案
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