效果一样就不演示了。如果是已知异常错误码应该为200，一个是500异常是系统无法处理，系统错误，但是已知错误是属于系统正常处理。另一个是监控系统，认为报500错误，是会持续放出系统警告。
还有一种局部异常，只在mvc中生效，而不是全局生效:
public class MyExceptionFilter : IExceptionFilter { public void OnException(ExceptionContext context) { IKnownException knownException = context.Exception as IKnownException; if (knownException == null) { var logger = context.HttpContext.RequestServices.GetService<ILogger<MyExceptionFilterAttribute>>(); logger.LogError(context.Exception, context.Exception.Message); knownException = KnownException.Unknown; context.HttpContext.Response.StatusCode = StatusCodes.Status500InternalServerError; } else { knownException = KnownException.FromKnownException(knownException); context.HttpContext.Response.StatusCode = StatusCodes.Status200OK; } context.Result = new JsonResult(knownException) { ContentType = "application/json; charset=utf-8" }; } }
在mvc 中注册:
services.AddMvc(mvcOptions => { mvcOptions.Filters.Add<MyExceptionFilter>(); }).AddJsonOptions(jsonOptions => { jsonOptions.JsonSerializerOptions.Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping; });
最后介绍一种，只作用于某个控制器，或者action:
public class MyExceptionFilterAttribute : ExceptionFilterAttribute { public override void OnException(ExceptionContext context) { IKnownException knownException = context.Exception as IKnownException; if (knownException == null) { var logger = context.HttpContext.RequestServices.GetService<ILogger<MyExceptionFilterAttribute>>(); logger.LogError(context.Exception, context.Exception.Message); knownException = KnownException.Unknown; context.HttpContext.Response.StatusCode = StatusCodes.Status500InternalServerError; } else { knownException = KnownException.FromKnownException(knownException); context.HttpContext.Response.StatusCode = StatusCodes.Status200OK; } context.Result = new JsonResult(knownException) { ContentType = "application/json; charset=utf-8" }; } }
查看一下ExceptionFilterAttribute头部:
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = true, Inherited = true)] public abstract class ExceptionFilterAttribute : Attribute, IAsyncExceptionFilter, IExceptionFilter, IOrderedFilter
上面标志了可以放于类上也可以放于方法上。所以可以放至在controller上，也可以action上，看需求了。