Question

How do you implement exception handling and logging in .NET Core applications? Talk about tools and common practices that can be used.

Answer 1

In .NET Core applications, exception handling and logging are implemented using middleware components. Middleware is a chain of components that handle requests and responses in the application pipeline.

For exception handling, use the built-in “UseExceptionHandler” middleware to catch exceptions and provide custom error pages or responses. Configure it in the “Startup.cs” file within the “Configure” method:

app.UseExceptionHandler(options =>

{

options.Run(async context =>

{

// Custom error response logic here

});

});

For logging, utilize the ILogger interface provided by Microsoft.Extensions.Logging namespace. Inject ILogger into classes via dependency injection:

public class MyClass

{

private readonly ILogger<MyClass> _logger;

public MyClass(ILogger<MyClass> logger)

{

_logger = logger;

}

}

Log messages with different severity levels: Trace, Debug, Information, Warning, Error, Critical:

_logger.LogInformation("This is an information log message.");