#region 指定错误处理动作
app.UseStatusCodePagesWithReExecute("/Error/{0}");//只要不是200 都能进来
app.UseExceptionHandler(errorApp =>
{
errorApp.Run(async context =>
{
context.Response.StatusCode = 200;
context.Response.ContentType = "text/html";
await context.Response.WriteAsync("<html lang=\"en\"><body>\r\n");
await context.Response.WriteAsync("ERROR!<br><br>\r\n");
var exceptionHandlerPathFeature =
context.Features.Get<IExceptionHandlerPathFeature>();
Console.WriteLine("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&");
Console.WriteLine($"{exceptionHandlerPathFeature?.Error.Message}");
Console.WriteLine("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&");
// Use exceptionHandlerPathFeature to process the exception (for example,
// logging), but do NOT expose sensitive error information directly to
// the client.
if (exceptionHandlerPathFeature?.Error is FileNotFoundException)
{
await context.Response.WriteAsync("File error thrown!<br><br>\r\n");
}
await context.Response.WriteAsync("<a href=\"/\">Home</a><br>\r\n");
await context.Response.WriteAsync("</body></html>\r\n");
await context.Response.WriteAsync(new string(‘ ‘, 512)); // IE padding
});
});
app.UseHsts();
#endregion
原文：https://www.cnblogs.com/Robert-huge/p/12870304.html