ASP.NET Core全局异常处理

1.使用中间件做全局异常处理，具体代码如下：

 public class CustomExceptionMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly ILogger<CustomExceptionMiddleware> _logger;

        public CustomExceptionMiddleware(RequestDelegate next, ILogger<CustomExceptionMiddleware> logger)
        {
            _next = next;
            _logger = logger;
        }

        public async Task Invoke(HttpContext httpContext)
        {
            try
            {
                await _next(httpContext);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Unhandled exception...");
                await HandleExceptionAsync(httpContext, ex);
            }
        }

        private Task HandleExceptionAsync(HttpContext httpContext, Exception ex)
        {
            var result = JsonConvert.SerializeObject(new { isSuccess = false, message = ex.Message });
            httpContext.Response.ContentType = "application/json;charset=utf-8";
            return httpContext.Response.WriteAsync(result);
        }
    }

    // Extension method used to add the middleware to the HTTP request pipeline.
    public static class CustomExceptionMiddlewareExtensions
    {
        public static IApplicationBuilder UseCustomExceptionMiddleware(this IApplicationBuilder builder)
        {
            return builder.UseMiddleware<CustomExceptionMiddleware>();
        }
    }

然后在Startup类的Configure方法里添加上述扩展的中间件

 public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            app.UseCustomExceptionMiddleware();
            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }

2.使用过滤器做全局异常处理，具体代码如下：

 public class CustomerExceptionFilter : ExceptionFilterAttribute
    {
        private readonly ILogger<CustomerExceptionFilter> _logger;

        public CustomerExceptionFilter(ILogger<CustomerExceptionFilter> logger)
        {
            _logger = logger;
        }

        public override void OnException(ExceptionContext context)
        {
            Exception ex = context.Exception;
            HttpRequest request = context.HttpContext.Request;
            string requestUrl = $"{request.Scheme}://{request.Host.Value}{request.Path}";
            string errorMsg = $"error:{ex.GetBaseException().Message};requesturl:{requestUrl}"; 
            _logger.LogError(errorMsg);
            var result = new { code = 0, msg = errorMsg, data = "" };
            string json = JsonConvert.SerializeObject(result);
            context.HttpContext.Response.StatusCode = StatusCodes.Status200OK;
            context.HttpContext.Response.ContentType = "application/json;charset=utf-8";
            context.HttpContext.Response.WriteAsync(json);
            context.ExceptionHandled = true;
        }
    }