1.继承ExceptionFilterAttribute类,重写OnException方法
public class WebApiExceptionFilterAttribute : ExceptionFilterAttribute { //重写基类的异常处理方法 public override void OnException(HttpActionExecutedContext actionExecutedContext) { //业务异常处理 if (actionExecutedContext.Exception is BusinessException) { var businessException = (BusinessException)actionExecutedContext.Exception; //自定义业务异常编码 int businessExceptionCode = businessException.ErrorMessage.Code; //业务异常消息 string businessExceptionMsg = businessException.Message; //异常消息Json串 var err = new { errcode = businessExceptionCode, errmsg = businessExceptionMsg }; string errMsg = JsonConvert.SerializeObject(err); //系统异常码 var oResponse = new HttpResponseMessage(HttpStatusCode.InternalServerError); oResponse.Content = new StringContent(" "); oResponse.Headers.Add("errMsg", errMsg); actionExecutedContext.Response = oResponse; } else { actionExecutedContext.Response = new HttpResponseMessage(HttpStatusCode.InternalServerError); //异常消息Json串 var err = new { errcode = CommonErrorCode.ServiceError, errmsg = actionExecutedContext.Exception.Message }; string errMsg = JsonConvert.SerializeObject(err); //系统异常码 var oResponse = new HttpResponseMessage(HttpStatusCode.InternalServerError); oResponse.Content = new StringContent(" "); oResponse.Headers.Add("errMsg", errMsg); actionExecutedContext.Response = oResponse; } base.OnException(actionExecutedContext); } }
2. Global.asax中,Application_Start方法中添加过滤器
protected void Application_Start() { GlobalConfiguration.Configure(WebApiConfig.Register); GlobalConfiguration.Configuration.Filters.Add(new WebApiExceptionFilterAttribute()); }
3.例子:
控制器:
public class TestController : ApiController { [HttpGet] public string GetTest1() { return "value1"; } [HttpGet] public string GetTest2() { throw new BusinessException(123456,"业务异常"); } [HttpGet] public string GetTest3() { throw new Exception("系统异常"); } }
结果:
提升:
为了满足每个webapi项目都应用自定义异常,把异常类封装到程序集中使用
1.结构:
问题:YesWay.WebAPI异常抛出类库添加引用需与webapI项目用的引用需相同,
之前的这些我都是在引用管理器,程序集中一个个找的,添加的,出现进不了OnException方法的问题,用nuget添加的就好了,可能是版本不一样吧
具体有这些东东:(他们之间有依赖,不需要一个个加,加一个可能会出来好几个...)
webapi需要引用的包:
Microsoft.AspNet.WebApi
Microsoft.AspNet.WebApi.Client
Microsoft.AspNet.WebApi.Client.zh-Hans
Microsoft.AspNet.WebApi.Core
Microsoft.AspNet.WebApi.Core.zh-Hans
Microsoft.AspNet.WebApi.WebHost
Microsoft.AspNet.WebApi.WebHost.zh-Hans
Microsoft.CodeDom.Providers.DotNetCompilerPlat
Microsoft.Net.Compilers
Newtonsoft.Json
2.webapi项目引用程序集
3.可以在控制器,控制器方法加特性使用
global中加这句,所有的控制器就都加上了
![](https://images2018.cnblogs.com/blog/937151/201806/937151-20180608134054355-671843170.png)