Simple and convenient error logging for sites on .NET Core

Perhaps, many are familiar with the ELMAH (Error Logging Modules and Handlers) library , which allows you to organize simple error logging for any site created with the .NET Framework.

This simple and time-tested tool has helped me out in many projects.

Several years ago, while creating my new project for .NET Core, I was annoyed to find that ELMAH does not work under .NET Core.

opensource ! , ELMAH .NET Core.

, , pet-. , , «» ElmahCore.

, ElmahCore – opensource , , .NET Core.

, , :

• ,
• HTTP : (header), , cookies,

, Microsoft.Extensions.Logging (ILogger) HTTP .

:

• XML
• , MSSQL, MySQL, PostgreSQL

:

1. nuget- elmahcore.
2. Startup.cs:

services.AddElmah(); //   ConfigureServices 
app.UseElmah(); //    Configure
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

.

, , ~/elmah.

UI, VUE.js

, . :

services.AddElmah(options =>
{
   options.SourcePaths = new []
   {
      @"D:\tmp\ElmahCore.DemoCore3",
      @"D:\tmp\ElmahCore.Mvc",
      @"D:\tmp\ElmahCore"
   };
});

      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

«Log» Microsoft.Extensions.Logging HTTP .

, !

, :

services.AddElmah(options =>
{
        options.OnPermissionCheck = context => context.User.Identity.IsAuthenticated;
});
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

UseElmah, UseAuthentication UseAuthorization

app.UseAuthentication();
app.UseAuthorization();
app.UseElmah();
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

You can filter logged errors using filters implemented in code (implementing the IErrorFilter interface) or in the xml configuration file ( https://elmah.github.io/a/error-filtering/examples/ ).

services.AddElmah<XmlFileErrorLog>(options =>
{
    options.FiltersConfig = "elmah.xml";
    options.Filters.Add(new MyFilter());
})
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

In addition to registering the error log, the library allows you to organize the distribution of notifications (via the IErrorNotifier implementation), for example, to e-mail.

services.AddElmah<XmlFileErrorLog>(options =>
{
    options.Notifiers.Add(new ErrorMailNotifier("Email",emailOptions));
});
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

Hope this free library is helpful in your projects.

More information about the library can be found here .