如何在wpf MVVM light中的用户控件中动态更改按钮(单击)上的用户控件 [英] how to dynamically change userControl on button (click) present in the usercontrol in wpf MVVM light
问题描述
我有一个主窗口，将 Usercontrol 托管为 ContentControl 主机.我想要的是，将按钮单击时的 usercontrol(存在于第一个 Usercontrol 中)动态更改为另一个 usercontrol.
I have a Main Window that host Usercontrol as ContentControl host.What i want is, to dynamically change usercontrol on button click(present in the first Usercontrol ) to another usercontrol.
目前我在主窗口资源中创建了一个 DataTemplate，其中包含用户控件的相应 ViewModel
Currently I have created a DataTemplate in the Main Window resources consisting of the respective ViewModel of the usercontrol
<DataTemplate DataType="{x:Type Tube:ViewModel1}" >
<Tube:View1/>
</DataTemplate>
<DataTemplate DataType="{x:Type Tube1:ViewModel2}">
<Tube2:View2/>
</DataTemplate>
我想在 view1 中单击按钮时从 View1 更改为 view2.那么我应该如何在 ViewModel1(US1 viewModel) 中更改为 US2
I want to change to from View1 to view2 on button click present in view1. So what should i do in ViewModel1(US1 viewModel) to change to US2
我目前正在研究 MVVM 灯.
I am currently working on MVVM light.
我有一个服务定位器，其中包含每个 VM 的注册实例.问题是我如何指向 VM1 中的 VM2 实例.
I have a service locator that has the registered instance of each VM. The problem is how can i point to VM2 instance in VM1.
欢迎任何帮助！！！！！！
Any help is welcomed!!!!!
推荐答案
将你的 Window 当作 shell，并使用 MvvmLight 的 Messenger 向你的 shell 发送消息以交换视图.
Treat your Window as shell and send messages using MvvmLight's Messenger to your shell in order to swap views.
例如:
MainWindow.xaml
MainWindow.xaml
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication1"
Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
<local:MainWindowViewModel></local:MainWindowViewModel>
</Window.DataContext>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="20"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Button Grid.Row="0" Grid.Column="0" Command="{Binding ChangeFirstViewCommand}">Change View #1</Button>
<Button Grid.Row="0" Grid.Column="1" Command="{Binding ChangeSecondViewCommand}">Change View #2</Button>
<ContentControl Grid.Row="1" Grid.ColumnSpan="2" Content="{Binding ContentControlView}"></ContentControl>
</Grid>
</Window>
MainWindowViewModel.cs
MainWindowViewModel.cs
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using GalaSoft.MvvmLight.Messaging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
namespace WpfApplication1
{
public class MainWindowViewModel : ViewModelBase
{
private FrameworkElement _contentControlView;
public FrameworkElement ContentControlView
{
get { return _contentControlView; }
set
{
_contentControlView = value;
RaisePropertyChanged("ContentControlView");
}
}
public MainWindowViewModel()
{
Messenger.Default.Register<SwitchViewMessage>(this, (switchViewMessage) =>
{
SwitchView(switchViewMessage.ViewName);
});
}
public ICommand ChangeFirstViewCommand
{
get
{
return new RelayCommand(() =>
{
SwitchView("FirstView");
});
}
}
public ICommand ChangeSecondViewCommand
{
get
{
return new RelayCommand(() =>
{
SwitchView("SecondView");
});
}
}
public void SwitchView(string viewName)
{
switch (viewName)
{
case "FirstView":
ContentControlView = new FirstView();
ContentControlView.DataContext = new FirstViewModel() { Text = "This is the first View" };
break;
default:
ContentControlView = new SecondView();
ContentControlView.DataContext = new SecondViewModel() { Text = "This is the second View" };
break;
}
}
}
}
FirstView.xaml
FirstView.xaml
<UserControl x:Class="WpfApplication1.FirstView"
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"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<StackPanel>
<Label>This is the second view</Label>
<Label Content="{Binding Text}" />
<Button Command="{Binding ChangeToSecondViewCommand}">Change to Second View</Button>
</StackPanel>
</UserControl>
FirstViewModel.cs
FirstViewModel.cs
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using GalaSoft.MvvmLight.Messaging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
namespace WpfApplication1
{
public class FirstViewModel : ViewModelBase
{
private string _text;
public string Text
{
get { return _text; }
set
{
_text = value;
RaisePropertyChanged("Text");
}
}
public ICommand ChangeToSecondViewCommand
{
get
{
return new RelayCommand(() =>
{
Messenger.Default.Send<SwitchViewMessage>(new SwitchViewMessage { ViewName = "SecondView" });
});
}
}
}
}
SecondView.xaml
SecondView.xaml
<UserControl x:Class="WpfApplication1.SecondView"
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"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<StackPanel>
<Label>This is the second view</Label>
<Label Content="{Binding Text}" />
<Button Command="{Binding ChangeToFirstViewCommand}">Change to First View</Button>
</StackPanel>
</UserControl>
SecondViewModel.cs
SecondViewModel.cs
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using GalaSoft.MvvmLight.Messaging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
namespace WpfApplication1
{
public class SecondViewModel : ViewModelBase
{
private string _text;
public string Text
{
get { return _text; }
set
{
_text = value;
RaisePropertyChanged("Text");
}
}
public ICommand ChangeToFirstViewCommand
{
get
{
return new RelayCommand(() =>
{
Messenger.Default.Send<SwitchViewMessage>(new SwitchViewMessage { ViewName = "FirstView" });
});
}
}
}
}
SwitchViewMessage.cs
SwitchViewMessage.cs
namespace WpfApplication1
{
public class SwitchViewMessage
{
public string ViewName { get; set; }
}
}
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