我正在尝试从viewmodel绑定我的masterdetailpage细节.但它不起作用.
这是我的代码:
<?xml version="1.0" encoding="utf-8" ?>
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:MasterDetailsSamp1"
x:Class="MasterDetailsSamp1.MainPage"
xmlns:vm="clr-namespace:MasterDetailsSamp1.ViewModels">
<MasterDetailPage.BindingContext>
<vm:MasterDetailsViewModel/>
</MasterDetailPage.BindingContext>
<MasterDetailPage.Master>
<ContentPage Title="Menu">
<StackLayout>
</StackLayout>
</ContentPage>
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
<NavigationPage>
</NavigationPage>
</MasterDetailPage.Detail>
这是我的viewmodel中的代码
public MasterDetailsViewModel()
{
MasterDetailPage masterDetailPage = new MasterDetailPage
{
Detail = new NavigationPage((Page)Activator.CreateInstance(typeof(HomePage)))
};
}
当我放这行代码时,它正在工作
Detail = new NavigationPage((Page)Activator.CreateInstance(typeof(HomePage)))
代码背后,但我想从视图模型中实现它.
请帮忙.先感谢您
最佳答案 您需要在Master和详细信息上添加绑定上下文:
<?xml version="1.0" encoding="UTF-8" ?>
<MasterDetailPage
xmlns="http://xamarin.com/schemas/2014/forms"
x:Class="MasterDetailExample.Main"
Title="Master Detail Example">
<MasterDetailPage.Master>
<ContentPage Padding="5, 25" BindingContext="{Binding Menu}" Title="Master">
<StackLayout Orientation="Vertical">
<Label Text="Master" HorizontalOptions="Center" />
<Label Text="{Binding Subtitle}" HorizontalOptions="Center" />
</StackLayout>
</ContentPage>
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
<ContentPage>
</ContentPage>
</MasterDetailPage.Detail>
</MasterDetailPage>
要在ViewModel中更改您的详细信息页面,我使用:
(Application.Current.MainPage as MasterDetailPage).Detail = new NavigationPage((Page)Activator.CreateInstance(typeof(YOURDETAILPAGE)));
我不确定这是否是这项工作的最佳方式,MVVM和MasterDetail文档需要澄清.
不要忘记绑定上下文项需要实现INotifyPropertyChanged才能工作.
希望这有帮助.