C#绑定赢得';在MVVM灯光下使用导航时,不能在WPF中工作
我使用MVVMLight和MahApps创建平面UI应用程序(WPF)。我想让导航系统正常工作 看起来一切正常,但主窗口上框架托管的页面上的数据绑定存在问题。我声明我想在Login视图中绑定LoginViewModel,但当我尝试单击一个按钮(它连接到viewmodel中的RelayCommand)时,什么也没发生(我已经用调试器检查过) 如何将页面绑定到viewmodel的好方法 这是我的Login.xaml(第页):C#绑定赢得';在MVVM灯光下使用导航时,不能在WPF中工作,c#,.net,wpf,xaml,mvvm,C#,.net,Wpf,Xaml,Mvvm,我使用MVVMLight和MahApps创建平面UI应用程序(WPF)。我想让导航系统正常工作 看起来一切正常,但主窗口上框架托管的页面上的数据绑定存在问题。我声明我想在Login视图中绑定LoginViewModel,但当我尝试单击一个按钮(它连接到viewmodel中的RelayCommand)时,什么也没发生(我已经用调试器检查过) 如何将页面绑定到viewmodel的好方法 这是我的Login.xaml(第页): 您是否尝试过在第一个上设置数据绑定?在根级别对象上设置该属性可能会导致问
您是否尝试过在第一个
上设置数据绑定?在根级别对象上设置该属性可能会导致问题,因为该属性可能是由承载页面/窗口的控件设置的
<Page x:Class="Project.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:Project"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
mc:Ignorable="d"
d:DesignHeight="480" d:DesignWidth="640"
Title="Login">
<Grid DataContext="{Binding LoginViewModel, Source={StaticResource Locator}}">
<Button Command="{Binding GoToVote}" Content="{Binding Path=ButtonText}" HorizontalAlignment="Left" Margin="224,220,0,0" VerticalAlignment="Top" Width="75"/>
<TextBox x:Name="textBox" HorizontalAlignment="Left" Height="23" Margin="224,320,0,0" TextWrapping="Wrap" Text="{Binding Path=ButtonText, Mode=TwoWay}" VerticalAlignment="Top" Width="120"/>
</Grid>
</Page>
主窗口上可能也有同样的东西
(我猜您在App.xaml
中声明了Locator
)尝试更改)
使用GalaSoft.MvvmLight.Command;->使用GalaSoft.MvvmLight.CommandWpf 好的,解决了
我犯了两个可怕的错误(我不知道如何)。
第一:
在我的类ViewModelNavigationBase中,我忘记了实现ViewModelBase(它是带有导航对象的扩展)
第二个-我将按钮命令绑定到函数,而不是属性(ICommand) 它没有按预期工作。奇怪的事情发生了-当我点击按钮时,并没有任何动作,只有刷新按钮的内容(按钮的内容应该在输入文本框后刷新-但它不会工作)。你们有snoop吗?这将告诉您数据上下文实际上是什么。一旦你知道了这一点,你就会对正在发生的事情有一个更好的了解。(注意snoop正在嗅探什么!)这是一个有用的工具。谢谢
<Controls:MetroWindow x:Class="Project.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:local="clr-namespace:Project"
mc:Ignorable="d"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
DataContext="{Binding MainViewModel, Source={StaticResource Locator}}"
Title="MainWindow" Height="480" Width="640">
<Frame Source="View/Login.xaml" x:Name="MainFrame" NavigationUIVisibility="Hidden" />
</Controls:MetroWindow>
using Project.Tools;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Ioc;
using Microsoft.Practices.ServiceLocation;
using System;
namespace Project.ViewModel
{
/// <summary>
/// This class contains static references to all the view models in the
/// application and provides an entry point for the bindings.
/// </summary>
public class ViewModelLocator
{
/// <summary>
/// Initializes a new instance of the ViewModelLocator class.
/// </summary>
public ViewModelLocator()
{
ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
////if (ViewModelBase.IsInDesignModeStatic)
////{
//// // Create design time view services and models
//// SimpleIoc.Default.Register<IDataService, DesignDataService>();
////}
////else
////{
//// // Create run time view services and models
//// SimpleIoc.Default.Register<IDataService, DataService>();
////}
SimpleIoc.Default.Register<MainViewModel>();
SimpleIoc.Default.Register<LoginViewModel>();
SimpleIoc.Default.Register<VoteViewModel>();
var navigationService = new FrameNavigationService();
navigationService.Configure("Login", new Uri("../View/Login.xaml", UriKind.Relative));
navigationService.Configure("Vote", new Uri("../View/Vote.xaml", UriKind.Relative));
SimpleIoc.Default.Register<IFrameNavigationService>(() => navigationService);
}
public MainViewModel MainViewModel
{
get
{
return ServiceLocator.Current.GetInstance<MainViewModel>();
}
}
public LoginViewModel LoginViewModel
{
get
{
return ServiceLocator.Current.GetInstance<LoginViewModel>();
}
}
public VoteViewModel VoteViewModel
{
get
{
return ServiceLocator.Current.GetInstance<VoteViewModel>();
}
}
public static void Cleanup()
{
// TODO Clear the ViewModels
}
}
}
using Project.Tools;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Project.ViewModel
{
public class LoginViewModel : ViewModelNavigationBase
{
private string _buttonText;
public RelayCommand GoCommand { get; private set; }
void GoToVote()
{
_navigationService.NavigateTo("Vote");
}
public LoginViewModel(IFrameNavigationService navigationService) : base(navigationService)
{
GoCommand = new RelayCommand(GoToVote);
}
public string ButtonText
{
get { return _buttonText; }
set
{
_buttonText = value;
}
}
}
}
<Page x:Class="Project.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:Project"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
mc:Ignorable="d"
d:DesignHeight="480" d:DesignWidth="640"
Title="Login">
<Grid DataContext="{Binding LoginViewModel, Source={StaticResource Locator}}">
<Button Command="{Binding GoToVote}" Content="{Binding Path=ButtonText}" HorizontalAlignment="Left" Margin="224,220,0,0" VerticalAlignment="Top" Width="75"/>
<TextBox x:Name="textBox" HorizontalAlignment="Left" Height="23" Margin="224,320,0,0" TextWrapping="Wrap" Text="{Binding Path=ButtonText, Mode=TwoWay}" VerticalAlignment="Top" Width="120"/>
</Grid>
</Page>