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Xamarin.Forms - XamlCompilation MissingMethodException

I want to improve the performance of my Xamarin.Forms UWP application because it is very slow in release mode (verified by. NET native). Therefore, I use assembly-level XAMLC in the PCL project:

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

but with this attribute I get a runtime error:

"Method not found: 'Void Xamarin.Forms.Xaml.Internals.SimpleValueTargetProvider..ctor (System.Object [])'."

According to this:

https://github.com/xamarin/Xamarin.Forms/blob/master/docs/Xamarin.Forms.Xaml/Xamarin.Forms.Xaml.Internals/SimpleValueTargetProvider.xml

The SimpleValueTargetProvider class has 2 versions:

  • 1.5.0.0 - constructor with one parameter System.Object []
  • 2.0.0.0 - constructor with 2 parameters System.Object [] and System.Object

I use Xamarin.Forms 2.3.3.163-pre3, so I use the second version in my project (when I go to SimpleValueTargetProvider in Xamarin.Forms.Xaml.Internals, I see a constructor with 2 parameters). As far as I understand, “something” still calls SimpleValueTargetProvider 1.5.0.0, but I have no idea what it is.

I removed all third-party components, but this did not help. I used Fusion Magazine to find out what happens, but that’s all I get (to be honest, I don’t know if this is due to the problem I am facing):

 > *** Assembly Binder Log Entry (10/26/2016 @ 9:09:42 PM) *** > > The operation failed. Bind result: hr = 0x80070002. The system cannot > find the file specified. > > Assembly manager loaded from: > C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll Running under > executable C:\Program Files (x86)\Microsoft Visual > Studio\VS15Preview\Common7\IDE\devenv.exe > --- A detailed error log follows. > > === Pre-bind state information === LOG: DisplayName = XamlDesignerFaultInjection (Partial) WRN: Partial binding information > was supplied for an assembly: WRN: Assembly Name: > XamlDesignerFaultInjection | Domain ID: 1 WRN: A partial bind occurs > when only part of the assembly display name is provided. WRN: This > might result in the binder loading an incorrect assembly. WRN: It is > recommended to provide a fully specified textual identity for the > assembly, WRN: that consists of the simple name, version, culture, and > public key token. WRN: See whitepaper > http://go.microsoft.com/fwlink/?LinkId=109270 for more information and > common solutions to this issue. LOG: Appbase = file:///C:/Program > Files (x86)/Microsoft Visual Studio/VS15Preview/Common7/IDE/ LOG: > Initial PrivatePath = NULL LOG: Dynamic Base = NULL LOG: Cache Base = > NULL LOG: AppName = devenv.exe Calling assembly : (Unknown). > === LOG: This bind starts in default load context. LOG: Using application configuration file: > C:\Users\blaze\AppData\Local\Microsoft\VisualStudio\15.0_2f751565\devenv.exe.config > LOG: Using host configuration file: LOG: Using machine configuration > file from > C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config. > LOG: Policy not being applied to reference at this time (private, > custom, partial, or location-based assembly bind). LOG: Attempting > download of new URL file:///C:/Program Files (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/XamlDesignerFaultInjection.DLL. LOG: > Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/XamlDesignerFaultInjection/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PublicAssemblies/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PublicAssemblies/XamlDesignerFaultInjection/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/XamlDesignerFaultInjection/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Microsoft/TemplateProviders/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Microsoft/TemplateProviders/XamlDesignerFaultInjection/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Platform/Debugger/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Platform/Debugger/XamlDesignerFaultInjection/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Platform/DiagnosticsHub/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Platform/DiagnosticsHub/XamlDesignerFaultInjection/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/DataCollectors/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/DataCollectors/XamlDesignerFaultInjection/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/DataCollectors/x86/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/DataCollectors/x86/XamlDesignerFaultInjection/XamlDesignerFaultInjection.DLL. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/XamlDesignerFaultInjection.EXE. LOG: > Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/XamlDesignerFaultInjection/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PublicAssemblies/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PublicAssemblies/XamlDesignerFaultInjection/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/XamlDesignerFaultInjection/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Microsoft/TemplateProviders/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Microsoft/TemplateProviders/XamlDesignerFaultInjection/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Platform/Debugger/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Platform/Debugger/XamlDesignerFaultInjection/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Platform/DiagnosticsHub/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/CommonExtensions/Platform/DiagnosticsHub/XamlDesignerFaultInjection/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/DataCollectors/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/DataCollectors/XamlDesignerFaultInjection/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/DataCollectors/x86/XamlDesignerFaultInjection.EXE. > LOG: Attempting download of new URL file:///C:/Program Files > (x86)/Microsoft Visual > Studio/VS15Preview/Common7/IDE/PrivateAssemblies/DataCollectors/x86/XamlDesignerFaultInjection/XamlDesignerFaultInjection.EXE. > LOG: All probing URLs attempted and failed.

Is this a bug in Xamarin.Forms or XamlCTask? Has anyone encountered this problem or knows how to fix it?

  • Windows 10 64-bit
  • Visual Studion 15 Preview 5
  • Xamarin 4.2.1.14
  • Xamarin.Forms 2.3.3.163-pre3

thank you in advance

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3 answers

This is most likely a caching issue at the IDE or project level.

If it is at the IDE level: do clean - restart VS or XS - rebuild

but you probably already tried it.

I assume that one of the nuget updates has not been cleaned correctly, and you have a different version of XF that is referenced by another project of your solution, or one .csproj file .csproj referencing the old .targets file.

Some house cleaning guide will solve the problem, hopefully.

+12
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If your project depends on a third-party build that uses XamlC, and if that build was built on XF and 2.3.3, you can still get this problem.

A fix exists and will be released as part of the first release of the service for XF 2.3.3

+4
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For my part, I had a different version of Xamarin.Forms in my version for Core and Android. Set equally on all projects, solve it

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Source: https://habr.com/ru/post/1258874/

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