Tizen .NET: compiled binding

Question

Tizen .NET: compiled binding

smozhaykin opened this issue 4 years ago · comments

Does Tizen .NET supports compiled bingings?

By default all content pages created in visual studio contains [XamlCompilation(XamlCompilationOptions.Compile)] attributes. But when I add x:DataType="{x:Type vm:ViewModelType}" in page markup, I'm getting the following error during build:

1>View\MainMenuView.xaml : XamlC error : Value cannot be null.
1>View\MainMenuView.xaml : XamlC error : Parameter name: type

There are several similar issues reported before, but I think not for Tizen: xamarin/Xamarin.Forms#4678 (comment) xamarin/Xamarin.Forms#5416 (comment)

Some people reports the same on Xamarin forum: https://forums.xamarin.com/discussion/comment/400335/#Comment_400335

I've looked through the samples and haven't seen x:DataType usage: https://github.com/Samsung/Tizen-CSharp-Samples

If compiled bindings are not supported, are there any plans to support it?

Thanks

Seungkeun Lee · Answer 1 · Thu Oct 29 2020 20:17:18 GMT+0800 (China Standard Time)

I don't know means of compiled binding, anyways you can declare view model on XAML

Sergey Mozhaykin · Answer 2 · Thu Oct 29 2020 20:22:09 GMT+0800 (China Standard Time)

https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/data-binding/compiled-bindings

Seungkeun Lee · Answer 3 · Thu Oct 29 2020 20:24:10 GMT+0800 (China Standard Time)

Try like this, if does not works to you, please share your project files on here

<ContentPage.BindingContext> 
    <vm:ViewModelType/>
 </ContentPage.BindingContext>

Seungkeun Lee · Answer 4 · Thu Oct 29 2020 20:27:55 GMT+0800 (China Standard Time)

https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/data-binding/compiled-bindings

It is a things of core component, so tizen also support it

Seungkeun Lee · Answer 5 · Thu Oct 29 2020 20:46:30 GMT+0800 (China Standard Time)

Data bindings are working independently from platform
and xaml compile is not related with platform.

Sergey Mozhaykin · Answer 6 · Thu Oct 29 2020 21:16:33 GMT+0800 (China Standard Time)

Try like this, if does not works to you, please share your project files on here
<ContentPage.BindingContext> 
    <vm:ViewModelType/>
 </ContentPage.BindingContext>

It's not about setting data context.

@myroot could you please take a look:

https://github.com/smozhaykin/TizenCompiledBindingSample

There are two branches:

master - build completes successfully
issue - build fails:

c:\GitHub\TizenCompiledBindingSample>dotnet build -r tizen-armel -c Release TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample.csproj
Microsoft (R) Build Engine version 16.7.0+7fb82e5b2 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  Restored c:\GitHub\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample.csproj (in 295 ms).
MainPage.xaml : XamlC error : Value cannot be null. (Parameter 'type') [c:\GitHub\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample.csproj]

Build FAILED.

MainPage.xaml : XamlC error : Value cannot be null. (Parameter 'type') [c:\GitHub\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample.csproj]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:02.06

Failure diagnostic log attached:

failure.log

Seungkeun Lee · Answer 7 · Thu Oct 29 2020 21:27:06 GMT+0800 (China Standard Time)

Please update like this

x:DataType="vm:ViewModelType"

instead x:DataType="{x:Type vm:ViewModelType}"

Sergey Mozhaykin · Answer 8 · Thu Oct 29 2020 21:31:38 GMT+0800 (China Standard Time)

The same:

c:\GitHub\TizenCompiledBindingSample\TizenCompiledBindingSample>dotnet build -r tizen-armel -c Release TizenCompiledBindingSample\TizenCompiledBindingSample.csproj
Microsoft (R) Build Engine version 16.7.0+7fb82e5b2 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  All projects are up-to-date for restore.
MainPage.xaml : XamlC error : Value cannot be null. (Parameter 'type') [c:\GitHub\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample.csproj]

Build FAILED.

MainPage.xaml : XamlC error : Value cannot be null. (Parameter 'type') [c:\GitHub\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample\TizenCompiledBindingSample.csproj]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:01.75

branch issue_2

Seungkeun Lee · Answer 9 · Fri Oct 30 2020 09:41:23 GMT+0800 (China Standard Time)

@smozhaykin hi,
TargetFramework tizen40 has a trouble with this feature,
You can split a project into core(netstandard2.0) and tizen platfomr(tizen40) and it successfully compiled

smozhaykin/TizenCompiledBindingSample#1

Sergey Mozhaykin · Answer 10 · Fri Nov 06 2020 02:34:05 GMT+0800 (China Standard Time)

@myroot thanks a lot for your investigation! splitted projects work fine.