using System;
using System.Text.Encodings.Web;
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Diagnostics;
using Microsoft.AspNet.Hosting;
using Microsoft.AspNet.Http;
using Microsoft.AspNet.Http.Features;
namespace ExceptionHandlerSample
{
public class Startup
{
public void Configure(IApplicationBuilder app)
{
// Configure the error handler to show an error page.
app.UseExceptionHandler(errorApp =>
{
// Normally you'd use MVC or similar to render a nice page.
errorApp.Run(async context =>
{
context.Response.StatusCode = 500;
context.Response.ContentType = "text/html";
await context.Response.WriteAsync("\r\n");
await context.Response.WriteAsync("We're sorry, we encountered an un-expected issue with your application.
\r\n");
var error = context.Features.Get();
if (error != null)
{
// This error would not normally be exposed to the client
await context.Response.WriteAsync("
Error: " + HtmlEncoder.Default.Encode(error.Error.Message) + "
\r\n");
}
await context.Response.WriteAsync("
Home
\r\n");
await context.Response.WriteAsync("\r\n");
await context.Response.WriteAsync(new string(' ', 512)); // Padding for IE
});
});
// We could also configure it to re-execute the request on the normal pipeline with a different path.
// app.UseExceptionHandler("/error.html");
// The broken section of our application.
app.Map("/throw", throwApp =>
{
throwApp.Run(context => { throw new Exception("Application Exception"); });
});
app.UseStaticFiles();
// The home page.
app.Run(async context =>
{
context.Response.ContentType = "text/html";
await context.Response.WriteAsync("Welcome to the sample
\r\n");
await context.Response.WriteAsync("Click here to throw an exception: throw\r\n");
await context.Response.WriteAsync("\r\n");
});
}
public static void Main(string[] args)
{
var application = new WebApplicationBuilder()
.UseConfiguration(WebApplicationConfiguration.GetDefault(args))
.UseStartup()
.Build();
application.Run();
}
}
}