C#/.NET 分布式专题（SOA【面向服务】WebApi异常的三种处理方式)

异常处理特性

public class CustomExceptionFilterAttribute : ExceptionFilterAttribute
{
    /// <summary>
    /// 异常发生后(没有被catch)，会进到这里
    /// </summary>
    /// <param name="actionExecutedContext"></param>
    public override void OnException(HttpActionExecutedContext actionExecutedContext)
    {
        //actionExecutedContext.Response. 可以获取很多信息,日志一下
        Console.WriteLine(actionExecutedContext.Exception.Message);//日志一下
        actionExecutedContext.Response = actionExecutedContext.Request.CreateResponse(
            System.Net.HttpStatusCode.OK, new
            {
                Result = false,
                Msg = "出现异常，请联系管理员",
                //Value=
            });//创造一个返回
        //base.OnException(actionExecutedContext);
        //ExceptionHandler
    }
}

/// <summary>
/// WEBApi的全局异常处理
/// </summary>
public class CustomExceptionHandler : ExceptionHandler
{
    /// <summary>
    /// 判断是否要进行异常处理，规则自己定
    /// </summary>
    /// <param name="context"></param>
    /// <returns></returns>
    public override bool ShouldHandle(ExceptionHandlerContext context)
    {
        string url = context.Request.RequestUri.AbsoluteUri;
        return url.Contains("/api/");

        //return base.ShouldHandle(context);
    }
    /// <summary>
    /// 完成异常处理
    /// </summary>
    /// <param name="context"></param>
    public override void Handle(ExceptionHandlerContext context)
    {
        //Console.WriteLine(context);//log
        context.Result = new ResponseMessageResult(context.Request.CreateResponse(
            System.Net.HttpStatusCode.OK, new
            {
                Result = false,
                Msg = "出现异常，请联系管理员",
                Debug = context.Exception.Message
            }));

        //if(context.Exception is HttpException)
    }
}

对于异常的控制器和方法注册就不说了，全局注册说下

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API 配置和服务
        config.DependencyResolver = new UnityDependencyResolver(ContainerFactory.BuildContainer());

        //config.Filters.Add(new CustomBasicAuthorizeAttribute());//全局注册
        config.Filters.Add(new CustomExceptionFilterAttribute());

        config.Services.Replace(typeof(IExceptionHandler), new CustomExceptionHandler());//替换全局异常处理类

        //config.EnableCors(new EnableCorsAttribute("*", "*", "*"));//全部都允许，

        // Web API 路由
        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
         name: "CustomApi",//默认的api路由
         routeTemplate: "api/{controller}/{action}/{id}",//正则规则，以api开头，第二个是控制器  第三个是参数
         defaults: new { id = RouteParameter.Optional }
     	);
     	
        config.Routes.MapHttpRoute(
            name: "DefaultApi",//默认的api路由
            routeTemplate: "api/{controller}/{id}",//正则规则，以api开头，第二个是控制器  第三个是参数
            defaults: new { id = RouteParameter.Optional }
        );
    }
}