C# 如何在ContextActions Xamarin MVVM中设置项
如何在ContextActions中设置项。在我的示例中,我想设置默认汽车C# 如何在ContextActions Xamarin MVVM中设置项,c#,xamarin,mvvm,C#,Xamarin,Mvvm,如何在ContextActions中设置项。在我的示例中,我想设置默认汽车 <ListView.ItemTemplate> <DataTemplate> <ViewCell> <ViewCell.ContextActions> <MenuItem Text="Usta
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.ContextActions>
<MenuItem Text="Ustaw domyslny" Command="{Binding DefultCarCommand}" CommandParameter="{Binding .}"/>
</ViewCell.ContextActions>
<StackLayout>
<Label Text="{Binding RegistrationNumber}" />
<Label Text="{Binding Brand}" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
现在它不起作用了,我也不知道为什么请注意,菜单项的BindingContext是您在ListView的ItemSource中绑定的单个模型,而不是整个ViewModel。您需要使用引用绑定绑定到ViewModel属性,如下所示:
<ListView x:Name="MyListView">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.ContextActions>
<MenuItem Text="Ustaw domyslny" Command="{Binding Path=BindingContext.DefultCarCommand, Source={x:Reference Name=MyListView}}" CommandParameter="{Binding .}"/>
</ViewCell.ContextActions>
<StackLayout>
<Label Text="{Binding RegistrationNumber}" />
<Label Text="{Binding Brand}" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
什么不起作用?你的命令没有被触发吗?你的应用程序崩溃了吗?还有别的吗?绑定不起作用。我不能运行defultcar命令
<ListView x:Name="MyListView">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.ContextActions>
<MenuItem Text="Ustaw domyslny" Command="{Binding Path=BindingContext.DefultCarCommand, Source={x:Reference Name=MyListView}}" CommandParameter="{Binding .}"/>
</ViewCell.ContextActions>
<StackLayout>
<Label Text="{Binding RegistrationNumber}" />
<Label Text="{Binding Brand}" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>