Xamarin.Forms编译的绑定不适用于DataTemplate
问题描述：
我添加了 XamlComilation 在 App.xaml.cs
// https://docs.microsoft.com/en-us/xamarin/xamarin-forms/xaml/xamlc
[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
namespace Solution.Project
然后我将 DataTemplate 更改为
<DataTemplate x:Key="RectLayerDataTemplate" x:DataType="{x:Type viewmodels:RectLayerViewModel}">
<forms:RectLayerView forms:ValueX="{Binding ValueX}"
forms:ValueY="{Binding ValueY}"
forms:ValueWidth="{Binding ValueWidth}"
forms:ValueHeight="{Binding ValueHeight}"
forms:Color="{Binding Color}" />
</DataTemplate>
但是， DataTemplate 不适用于 BindableLayout.ItemSource 。
<AbsoluteLayout x:Name="CanvasLayout"
BindableLayout.ItemsSource="{Binding LayerViewModels}" />
答
您是否使用了 AbsoluteLayout 来使布局重叠，所以您认为它不起作用？
Did you use AbsoluteLayout to make the layout overlap, so you think it didn't work?
我使用 DataTemplate $创建了一个简单的示例c $ c>并将其设置为 StackLayout BindableLayout ，效果很好。
I create a simple sample,with the DataTemplate and set it to the StackLayout BindableLayout,it works well.
page.xaml：
the page.xaml:
<StackLayout x:Name="CanvasLayout" Orientation="Vertical"
BindableLayout.ItemsSource="{Binding LayerViewModels}" />
page.xam.cs：
page.xam.cs:
public MyPage()
{
InitializeComponent();
BindingContext = new MyData();
LayerDataTemplate s = new LayerDataTemplate();
BindableLayout.SetItemTemplate(CanvasLayout, s.template);
}
我的数据：
public class MyData
{
public ObservableCollection<RectLayerViewModel> LayerViewModels { set; get; } = new ObservableCollection<RectLayerViewModel>();
public MyData()
{
for (var x = 0; x < 6; x++)
{
LayerViewModels.Add(new RectLayerViewModel { Name = $"Added at {LayerViewModels.Count}", Type = 1 });
}
}
}
RectLayerViewModel ：
public class RectLayerViewModel
{
public string Name { get; set; }
public int Type { get; set; }
}
DataTemplate ：
<?xml version="1.0" encoding="UTF-8"?>
<ResourceDictionary xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local ="clr-namespace:EntryCa"
x:Class="EntryCa.LayerDataTemplate">
<DataTemplate x:Key="RectLayerDataTemplate" x:DataType="local:RectLayerViewModel">
<Label Text="{Binding Name}"
TextColor="Red"
FontAttributes="Bold" />
</DataTemplate>