在呈现页面之前,如何在ASP .NET Core 2.0中捕获未处理的异常? [英] How do I catch unhandled exceptions in ASP .NET Core 2.0 before the page is rendered?
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问题描述
我正在尝试将 sentry 集成到我的asp .net核心应用中。在服务器将500个ASP Net Core 2.0中的异常抛出之前,我似乎找不到直接的答案。
I am trying to integrate sentry into my asp .net core app. I can't seem to find a straight answer how to catch the exception before the server throws 500 in asp net core 2.0.
我已经搜索了官方文档。非开发模式。
I've searched official docs. Non-development mode.
推荐答案
这里是异常处理中间件的一个示例。
Here is an example of exception handling middleware. It returns custom verbiage with the 500 status code.
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Serilog;
using System;
using System.Diagnostics;
using System.Net;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace Foo
{
public class ExceptionHandlingMiddleware
{
private readonly RequestDelegate next;
public ExceptionHandlingMiddleware(RequestDelegate next)
{
this.next = next;
}
public async Task Invoke(HttpContext context)
{
try
{
await next(context);
}
catch (Exception ex)
{
await handleExceptionAsync(context, ex);
}
}
private static async Task handleExceptionAsync(HttpContext context, Exception exception)
{
string errorCode = calculateErrorCode(context.TraceIdentifier);
string message = string.Format("An unhandled exception occurred; please contact the help desk with the following error code: '{0}' [{1}]", errorCode, context.TraceIdentifier);
Log.Error(exception, message);
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
await context.Response.WriteAsync(message);
}
private static string calculateErrorCode(string traceIdentifier)
{
const int ErrorCodeLength = 6;
const string CodeValues = "BCDFGHJKLMNPQRSTVWXYZ";
MD5 hasher = MD5.Create();
StringBuilder sb = new StringBuilder(10);
byte[] traceBytes = hasher.ComputeHash(Encoding.UTF8.GetBytes(traceIdentifier));
int codeValuesLength = CodeValues.Length;
for (int i = 0; i < ErrorCodeLength; i++)
{
sb.Append(CodeValues[traceBytes[i] % codeValuesLength]);
}
return sb.ToString();
}
}
public static class ExceptionHandlingMiddlewareExtensions
{
public static IApplicationBuilder UseApiExceptionHandler(this IApplicationBuilder builder)
{
return builder.UseMiddleware<ExceptionHandlingMiddleware>();
}
}
}
在Startup.cs中配置
Configure in Startup.cs
app.UseApiExceptionHandler();
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