Following the publish of the API controller project, the following error occurs.

BiHu.AspNetCore.Demo.API.Controllers.ValuesController|ERROR| System.Private.CoreLib at System.Threading.Tasks.Task1.GetResultCore(Boolean waitCompletionNotification) at BiHu.AspNetCore.Demo.API.Controllers.ValuesController.Get() in D:\CompanyProject\BiHu.AspNetCore.Demo\src\BiHu.AspNetCore.Demo.API\Controllers\ValuesController.cs:line 53 One or more errors occurred. (Cannot find compilation library location for package 'System.Data.SqlClient') System.InvalidOperationException: Cannot find compilation library location for package 'System.Data.SqlClient' at Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths(ICompilationAssemblyResolver resolver, List1 assemblies) at Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths() at System.Linq.Enumerable.SelectManySingleSelectorIterator`2.MoveNext() at RazorLight.Compilation.DefaultMetadataReferenceManager.Resolve(DependencyContext dependencyContext) at RazorLight.Compilation.RoslynCompilationService.EnsureOptions() at RazorLight.Compilation.RoslynCompilationService.get_ParseOptions() at RazorLight.Compilation.RoslynCompilationService.CreateSyntaxTree(SourceText sourceText) at RazorLight.Compilation.RoslynCompilationService.CreateCompilation(String compilationContent, String assemblyName) at RazorLight.Compilation.RoslynCompilationService.CompileAndEmit(IGeneratedRazorTemplate razorTemplate) at RazorLight.Compilation.RoslynCompilationService.CompileAsync(IGeneratedRazorTemplate razorTemplate) — End of stack trace from previous location where exception was thrown — at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at RazorLight.Compilation.TemplateFactoryProvider.<CompileAsync>d__10.MoveNext() — End of stack trace from previous location where exception was thrown — at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at RazorLight.Compilation.TemplateFactoryProvider.<CreateFactoryAsync>d__8.MoveNext() — End of stack trace from previous location where exception was thrown — at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at RazorLight.RazorLightEngine.<CompileTemplateAsync>d__14.MoveNext() — End of stack trace from previous location where exception was thrown — at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at RazorLight.RazorLightEngine.<CompileRenderAsync>d__11.MoveNext()

[ragnarek81997]

I have the same problem, but only when building on a linux (.net core 2.1) in code

var _engine = new RazorLightEngineBuilder()
.UseFilesystemProject(Path.Combine(Directory.GetCurrentDirectory(), "Templates"))
.UseMemoryCachingProvider()
.Build();

var result = string.Empty;
var cacheResult = _engine.TemplateCache.RetrieveTemplate(viewPath);
if (cacheResult.Success)
{
	result = await _engine.RenderTemplateAsync(cacheResult.Template.TemplatePageFactory(), model);
}
else
{
	result = await _engine.CompileRenderAsync(viewPath, model);
}

exception

System.InvalidOperationException: Cannot find compilation library location for package 'Microsoft.NETCore.App'
at Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths(ICompilationAssemblyResolver resolver, List`1 assemblies)
at Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths()
at System.Linq.Enumerable.SelectManySingleSelectorIterator`2.MoveNext()
at RazorLight.Compilation.DefaultMetadataReferenceManager.Resolve(DependencyContext dependencyContext)
at RazorLight.Compilation.RoslynCompilationService.EnsureOptions()

[huanbd]

I’ve resolved this error, this is my work. In project file *.csproj, change to like this:

<PropertyGroup>
    ...
    <PreserveCompilationContext>true</PreserveCompilationContext>
    <MvcRazorCompileOnPublish>false</MvcRazorCompileOnPublish>
  </PropertyGroup>

and when deploy your project, copy all file/folder in bin folder