C# Xamarin MVVM Light ViewModelLocator在xaml中设置BindingContext
我想通过xaml而不是后端代码来设置BindingContext。目前我的任务如下:C# Xamarin MVVM Light ViewModelLocator在xaml中设置BindingContext,c#,xaml,mvvm,xamarin,C#,Xaml,Mvvm,Xamarin,我想通过xaml而不是后端代码来设置BindingContext。目前我的任务如下: public partial class MainPage : ContentPage { public MainPage() { InitializeComponent(); BindingContext = App.Locator.Main; } } 如何通过Xaml分配BindingContext?我试着这样做: public partial cl
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
BindingContext = App.Locator.Main;
}
}
如何通过Xaml分配BindingContext?我试着这样做:
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
BindingContext = App.Locator.Main;
}
}
LoginPage.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Codesign.DtpMobilePortable.Views.LoginPage" BindingContext="{Binding LoginPage, Source={StaticResource ViewModelLocator}}">
<StackLayout Spacing="20" Padding="50" VerticalOptions="Center">
<Entry x:Name = "EntryUsername" Text="{Binding EntryUsernameText}" Placeholder = "Username"/>
<Entry x:Name = "EntryPassword" Text="{Binding EntryPasswordText}" Placeholder = "Password" IsPassword = "true" />
<Button x:Name = "ButtonLogin"
Text = "{Binding LoginButtonText}"
TextColor = "White"
BackgroundColor = "{Binding LoginButtonColor}" Command="{Binding LoginCommand}"/>
</StackLayout>
</ContentPage>
<?xml version="1.0" encoding="utf-8" ?>
<Application xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:viewModels="clr-namespace:Codesign.DtpMobilePortable.ViewModels;assembly=Codesign.DtpMobilePortable"
x:Class="Codesign.DtpMobilePortable.Views.App">
<Application.Resources>
<viewModels:ViewModelLocator
x:Key="ViewModelLocator" />
</Application.Resources>
</Application>
App.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Codesign.DtpMobilePortable.Views.LoginPage" BindingContext="{Binding LoginPage, Source={StaticResource ViewModelLocator}}">
<StackLayout Spacing="20" Padding="50" VerticalOptions="Center">
<Entry x:Name = "EntryUsername" Text="{Binding EntryUsernameText}" Placeholder = "Username"/>
<Entry x:Name = "EntryPassword" Text="{Binding EntryPasswordText}" Placeholder = "Password" IsPassword = "true" />
<Button x:Name = "ButtonLogin"
Text = "{Binding LoginButtonText}"
TextColor = "White"
BackgroundColor = "{Binding LoginButtonColor}" Command="{Binding LoginCommand}"/>
</StackLayout>
</ContentPage>
<?xml version="1.0" encoding="utf-8" ?>
<Application xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:viewModels="clr-namespace:Codesign.DtpMobilePortable.ViewModels;assembly=Codesign.DtpMobilePortable"
x:Class="Codesign.DtpMobilePortable.Views.App">
<Application.Resources>
<viewModels:ViewModelLocator
x:Key="ViewModelLocator" />
</Application.Resources>
</Application>
但是我发现关于StaticResource的错误不存在。您应该在页眉上定义
StaticResources
名称空间
诸如此类的事:
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Codesign.DtpMobilePortable;assembly=Codesign.DtpMobilePortable"
xmlns:Vm="clr-namespace:Codesign.DtpMobilePortable.ViewModel;assembly=Codesign.DtpMobilePortable"
x:Class="Codesign.DtpMobilePortable.Views.LoginPage"
BindingContext="{Binding LoginPage, Source={StaticResource ViewModelLocator}}"
您应在页眉上定义静态资源
名称空间
诸如此类的事:
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Codesign.DtpMobilePortable;assembly=Codesign.DtpMobilePortable"
xmlns:Vm="clr-namespace:Codesign.DtpMobilePortable.ViewModel;assembly=Codesign.DtpMobilePortable"
x:Class="Codesign.DtpMobilePortable.Views.LoginPage"
BindingContext="{Binding LoginPage, Source={StaticResource ViewModelLocator}}"