[英]How to use more than one DataContext
我正在使用MVVM Light,在我的定位器中有兩個ViewModel。 但是,在頁面中,我想使用多個ViewModel在頁面的ui元素中使用它們的屬性,但是如何?
這是我的頁面的XAML:
<Page
x:Class="my_app.MainMenuPage"
xmlns:i="using:Microsoft.Xaml.Interactivity"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:my_app"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" Foreground="Red"
DataContext = "{Binding Source={StaticResource Locator}, Path=SettingsVM }">
這是我的定位器的代碼:
public class ViewModelLocator
{
public ViewModelLocator()
{
ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
SimpleIoc.Default.Register<StudentsViewModel>();
SimpleIoc.Default.Register<SettingsViewModel>();
}
public StudentsViewModel StudentsVM
{
get
{
return ServiceLocator.Current.GetInstance<StudentsViewModel>();
}
}
public SettingsViewModel SettingsVM
{
get
{
return ServiceLocator.Current.GetInstance<SettingsViewModel>();
}
}
public static void Cleanup() {}
}
所以,我顯然不能做這樣的事情:
DataContext = "{Binding Source={StaticResource Locator}, Path=SettingsVM, Path=StudentsVM}">
據我所知,您沒有使用2 DataContext
。 您使用一個DataContext
2個對象。 將DataContext
設置為Locator
(不帶任何Path
),然后Path=SettingsVM.PropertyC
每個綁定指定Path=StudentsVM.PropertyA
或Path=SettingsVM.PropertyC
<Page ... DataContext="{Binding Source={StaticResource Locator}}">
<!-- .... -->
<TextBlock Text="{Binding StudentsVM.PropertyA}"/>
<TextBlock Text="{Binding StudentsVM.PropertyB}"/>
<TextBlock Text="{Binding SettingsVM.PropertyC}"/>
<TextBlock Text="{Binding SettingsVM.PropertyD}"/>
<!-- .... -->
</Page>
或者如果您有更多要綁定的屬性,則可以在本地更改控件組的DataContext
<Page ... DataContext="{Binding Source={StaticResource Locator}}">
<!-- .... -->
<StackPanel DataContext="{Binding StudentsVM}">
<TextBlock Text="{Binding PropertyA}"/>
<TextBlock Text="{Binding PropertyB}"/>
</StackPanel>
<!-- .... -->
<StackPanel DataContext="{Binding SettingsVM}">
<TextBlock Text="{Binding PropertyC}"/>
<TextBlock Text="{Binding PropertyD}"/>
</StackPanel>
<!-- .... -->
</Page>
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