What does it mean to use a compiled binding?

Question

Use compiled bindings
Compiled bindings improve data binding performance in Xamarin.Forms applications by resolving binding expressions at compile time, rather than at runtime with reflection. Compiling a binding expression generates compiled code that typically resolves a binding 8-20 times quicker than using a classic binding. For more information, see Compiled Bindings.

I said, but I don't know how to do it.

Please tell me how to write in xaml and cs

Answer 1

Hi @TS44

You have to set this in your App.xaml.cs

using Xamarin.Forms.Xaml;

...  
[assembly: XamlCompilation (XamlCompilationOptions.Compile)]  
namespace mynamespace  
{  
  ...  
}  

then you have to Use the x:DataType attribute to provide the data type of the binding context of a VisualElement.

for example:

<ContentPage  
    xmlns="http://xamarin.com/schemas/2014/forms"  
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"  
    xmlns:viewmodels="clr-namespace:mynamespace"  
    x:Class="mynamespace.MainPage"  
    x:DataType="{x:Type viewmodels:MyPageViewModel}">  
  
    <ContentPage.BindingContext>  
        <viewmodels:MyPageViewModel />  
    </ContentPage.BindingContext>  
      
    <Label Text="{Binding MyValue}" />  
      
</ContentPage>  

Answer 2

Just add

[assembly:XamlCompilation(XamlCompilationOptions.Compile)]
namespace xxxx{

}

will open the compiled binding.

and in xaml you should tell the xaml which to check.

for details please check:
https://www.youtube.com/watch?v=q4EYysAgA9E