[英]MVVM - Access command from different class in XAML
In my project I have a TitleView
and GameView
. 在项目中,我有一个TitleView
和GameView
。 When the program launches, TitleView
is displayed. 程序启动时,将显示TitleView
。 The user clicks a button and GameView
is displayed. 用户单击一个按钮,将显示GameView
。 I am using MVVM Light which includes MainViewModel
which has commands to switch to the desired views: 我正在使用包含MainViewModel
MVVM Light,它具有可切换到所需视图的命令:
From MainViewModel.cs
从MainViewModel.cs
GameViewCommand = new RelayCommand(() => ExecuteGameViewCommand());
private void ExecuteGameViewCommand()
{
CurrentViewModel = MainViewModel._gameViewModel;
}
In TitleView.xaml, I need to access this command and I don't know how. 在TitleView.xaml中,我需要访问此命令,但我不知道如何操作。 I am very much a novice when it comes to XAML. 关于XAML,我非常新手。
From TitleView.xaml
从TitleView.xaml
<UserControl x:Class="AoW.Views.TitleView"
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:vm="clr-namespace:AoW.ViewModels"
mc:Ignorable="d"
d:DesignWidth="1020"
d:DesignHeight="740"
Width="1020"
Height="740">
<Button Content="New Game"
//This needs to bind to GameViewCommand in MainViewModel.cs
Command="{Binding GameViewCommand}"
Grid.Column="1"
Grid.Row="1"
HorizontalAlignment="Center"
VerticalAlignment="Center" />
If I put the following line into TitleView.xaml
... 如果我TitleView.xaml
下行放入TitleView.xaml
...
DataContext="{Binding Main, Source={StaticResource Locator}}"
... I can access GameViewCommand
, but I can't access any local commands. ...我可以访问GameViewCommand
,但是不能访问任何本地命令。
What can I do to gain access to GameViewCommand while maintaining control of local commands? 如何在保持对本地命令的控制的同时获得对GameViewCommand的访问权限?
If providing additional code would be helpful, please let me know. 如果提供其他代码有帮助,请告诉我。
I've fixed the problem. 我已经解决了这个问题。 All I had to was this: 我所要做的就是:
<Button Content="New Game"
Command="{Binding GameViewCommand}"
DataContext="{Binding Main, Source={StaticResource Locator}}"
Grid.Column="1"
Grid.Row="1"
HorizontalAlignment="Center"
VerticalAlignment="Center" />
<Button Content="Say Hello"
Command="{Binding SayHelloCommand}"
Grid.Column="2"
Grid.Row="2"
HorizontalAlignment="Center"
VerticalAlignment="Center" />
Turns out it was a very easy fix. 原来,这是一个非常简单的修复。
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