How to handle errors in middleware C# Asp.net Core?

In this article, you will learn, how to handle errors in middleware C# Asp.net Core?.

Our middleware will trigger the catch block and call the HandleExceptionAsync method.

public class ExceptionMiddleware
{
   private readonly RequestDelegate _next;
   private readonly ILoggerManager _logger;
   public ExceptionMiddleware(RequestDelegate next, ILoggerManager logger)
   {
      _logger = logger;
      _next = next;
   }
   public async Task InvokeAsync(HttpContext httpContext)
   {
      try{
            await _next(httpContext);
      }
      catch (Exception ex){
         _logger.LogError($"wrong: {ex}");
         await HandleExceptionAsync(httpContext, ex);
      }
   }

 

private Task HandleExceptionAsync(HttpContext context, Exception exception)
 {
      context.Response.ContentType = "application/json";
      context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
      return context.Response.WriteAsync(new ErrorDetails(){
         StatusCode = context.Response.StatusCode,
         Message = "Internal Server Error from custom middleware."
      }.ToString());
   }
}

Our ExceptionMiddlewareExtensions class with another static method.

public static void ConfigureCustomExceptionMiddleware(this IApplicationBuilder app)
{
   app.UseMiddleware<ExceptionMiddleware>();
}

use below method in the Configure method in the Startup class:-

app.ConfigureCustomExceptionMiddleware();

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How to handle errors in middleware C# Asp.net Core?
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