Windows Application Package Project throws Could not load file or assembly for UWP project.

SmilingMoon 981

When running uwp app by itself, it runs perfect. When I add the uwp app to Windows Application Package Project (WAPP), it throws "Could not load file or assembly.." exception on the spot meeting the first "await".

Where can I specify the version of the library in WAPP? I cannot find any place for version specification.

UWP runs good by itself, but when run WAPP, the exception occurs. I think this is caused by mismatch of the referencing .NET library version between WAPP and UWP app itself. Where should I start from?

Nico 106 Reputation points

2021-10-20T04:03:40.373+00:00

Can you share more code about writelog method?

SmilingMoon 981

Here is the code:

        private static SemaphoreSlim log_Semaphore = new SemaphoreSlim(1, 1);
        public async static Task WriteLog(string msg)
        {
            if (SysFolders.LogFile == null)
            {
                return;
            }
            await log_Semaphore.WaitAsync();
            try
            {
                string log = $"Logged at {DateTime.Now.ToLocalTime().ToString()} -----------" + Environment.NewLine + msg + Environment.NewLine;
                await Windows.Storage.FileIO.AppendTextAsync(SysFolders.LogFile, log);
            }
            catch (Exception ex)
            {
                // If another option is available to the app to log error(i.e. Azure Mobile Service, etc...) then try that here
                string s = ex.Message;
            }
            finally
            {
                log_Semaphore.Release();
            }
        }

SmilingMoon 981 Reputation points

2021-10-20T05:40:45.257+00:00

I don't think it's related WriteLog code because it still happens when I change the code like below;

Code hits "Console.WriteLine(msg);" code in the method and it throws when it is out of the method.
Nico 106 Reputation points

2021-10-20T06:07:57.613+00:00

Yep, you code looks current, and the problem looks the project has not loaded System.Threading assembly. Unfortunately, we can't reproduce your problem with blank uwp. we suggest your edit your app's target version to restore the assemblies. or update the project's Microsoft.NETCore,UniversalWindowsPlatform nuget to latest version.
SmilingMoon 981 Reputation points

2021-10-22T04:48:30.933+00:00

Finally I was able to pinpoint the exact component that cause the issue.
I'm uploaded the Test projects and solution file in one zip file here in onedrive (6.86MB): https://1drv.ms/u/s!AqB-HjXxUE9ngeJIpq7KnBsnPqvdSA?e=r2G3vJ

You can run in Debug x64 and see the error below.

As soon as I add NuGet package "System.Linq.Dyamic.Core", the issue happens. All works OK before installing the package to TestUWP project. When I uninstall it, it works again.

However, it seems it's NOT only the issue. When I installed "BingMapsRESTToolkit.Standard", the same issue occurred.

I can rewrite code to avoid use System.Linq.Dyamic.Core, but BingMapsRESTToolkit.Standard is showstopper.

Could you take a look?
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,851 Reputation points

2021-10-22T06:22:14.243+00:00

I found you reference BingMapsRESTToolkit.Standard is forked project, you could use BingMapsRESTToolkit to replace, during the testing, it could work well in my side.

Accepted answer

SmilingMoon 981 Reputation points

2021-11-02T00:22:46.4+00:00

After long struggle, here is the solution: create branch new projects from scratch.

Nuget package issue is one thing.
Also, there must be a bug in Package project. When I use the existing UWP project which has been submitted to Store many times, package project cannot find the dependencies.

So, I created new UWP project and added to Package project and rebuild entire project little by little carefully: copying codes and adding the Nuget packages.
It worked.
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Windows Application Package Project throws Could not load file or assembly for UWP project.

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