Getting the following error using Serilog.Settings.Configuration

[jwebber974]

Hello,

We are using the configuration library with a asp.net core 2.1 app and we are getting the following error when we try to build the logging configuration:

This is how we are building the configuration:

var configuration = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json")
.Build();

        var assemblyInfo = Assembly.GetEntryAssembly().GetName();
        Log.Logger = new LoggerConfiguration()
            .ReadFrom.Configuration(configuration)
            .MinimumLevel.Verbose()
            .Enrich.WithProcessId()
            .Enrich.WithEnvironmentUserName()
            .Enrich.WithMachineName()
            .Enrich.WithThreadId()
            .Enrich.WithProperty("ApplicationName", assemblyInfo.Name)
            .Enrich.WithProperty("Version", assemblyInfo.Version.ToString())
            .Enrich.FromLogContext()
            .CreateLogger();

This is the error:

Application: Integration.WebApi.exe
CoreCLR Version: 4.6.26606.2
Description: The process was terminated due to an unhandled exception.
Exception Info: System.TypeLoadException: Could not load type 'System.Web.IHttpModule' from assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
at System.Reflection.RuntimeAssembly.GetExportedTypes()
at Serilog.Settings.Configuration.ConfigurationReader.<>c.b__23_0(Assembly a)
at System.Linq.Enumerable.SelectManySingleSelectorIterator2.MoveNext() at System.Linq.Enumerable.SelectManySingleSelectorIterator2.MoveNext()
at System.Linq.Enumerable.WhereEnumerableIterator1.ToList() at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source)
at Serilog.Settings.Configuration.ConfigurationReader.FindEventEnricherConfigurationMethods(IReadOnlyCollection1 configurationAssemblies) at Serilog.Settings.Configuration.ConfigurationReader.ApplyEnrichment(LoggerConfiguration loggerConfiguration, IReadOnlyDictionary2 declaredLevelSwitches)
at Serilog.Settings.Configuration.ConfigurationReader.Configure(LoggerConfiguration loggerConfiguration)
at Serilog.Configuration.LoggerSettingsConfiguration.Settings(ILoggerSettings settings)
at Integration.WebApi.Program.Main(String[] args) in C:\src\igsolutions_repo\Code\Integration.WebApi\Program.cs:line 21

[tsimbalar]

Hi Jeff,

could you also post the contents of your appsettings.json file please ?

[jwebber974]

Sure thing. Here it is.

[tsimbalar]

Are you by any chance referencing any System.Web dependent libraries in your project ? I am not sure this can work in a ASP.NET Core app.

The error message Could not load type 'System.Web.IHttpModule' from assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes) is suspicious :P .

[jwebber974]

I think you are correct. There were a couple project references to .NET FX projects and when I removed them, the error went away. Seems like a .NET framework to Core compatibility issue. I'll close it out.

[tsimbalar]

Thanks for the feedback, Jeff 👍