NetCore專案實戰篇02---全域性異常處理
阿新 • • 發佈:2020-05-03
在 .netcore中可以自定義自己的異常型別,步驟如下:
1、自定義自己的異常型別UserOperationException 並繼承自Exception
public class UserOperationException:Exception { public UserOperationException() { } public UserOperationException(string message) : base(message) { } public UserOperationException(string message, Exception innerException) : base(message, innerException) { } }
2、自定義自己的全域性異常過濾器GlobalExceptionFilter 實現介面 IExceptionFilter
public class GlobalExceptionFilter : IExceptionFilter { private readonly IHostingEnvironment _env; private readonly ILogger<GlobalExceptionFilter> _logger; public GlobalExceptionFilter(IHostingEnvironment env, ILogger<GlobalExceptionFilter> logger) { _env = env; _logger = logger; } public void OnException(ExceptionContext context) { var json = new JsonErrorResponse { Message = context.Exception.Message }; if (context.Exception.GetType() == typeof(UserOperationException)) { context.Result = new BadRequestObjectResult(json); }else { json.Message = "zhengweiProject中發生了未知的內部異常!"; if(_env.IsDevelopment()) { json.Message = context.Exception.StackTrace; } context.Result = new InternalServerErrorObjectResult(json); } _logger.LogError(context.Exception, context.Exception.Message); context.ExceptionHandled = true; } } public class InternalServerErrorObjectResult:ObjectResult { public InternalServerErrorObjectResult(object error):base(error) { StatusCode = StatusCodes.Status500InternalServerError; } }
3、在專案中使用,第一篇文章已說過,專案使用微服務webapi架構。新建控制器UserController.cs 在get方法中丟擲異常,
在獲取UserIdentity值時故意獲取了資料庫中沒有的值
[Route("api/users")] public class UserController : BaseController { public UserContext _userContext; public UserController(UserContext userContext) { _userContext = userContext; } // GET api/values [Route("")] [HttpGet] public async Task<IActionResult> Get() { var user =_userContext.Users.SingleOrDefault(u=>u.Id == UserIdentity.UserId); if(user == null) { throw new UserOperationException("獲取使用者資料出錯,使用者ID:"+UserIdentity.UserId); } return Json(user); } // GET api/values/5 [HttpGet("{id}")] public string Get(int id) { return "value"; } // POST api/values [Route("")] [HttpPost] public void Post([FromBody]string value) { } // PUT api/values/5 [Route("")] [HttpPut("{id}")] public void Put(int id, [FromBody]string value) { } // DELETE api/values/5 [HttpDelete("{id}")] public void Delete(int id) { } }
4、執行專案後,postman訪問API,結果如下:
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