[英]Returning JSON error message for Task<IHttpActionResult> method
我创建了一个ASP.NET Web API,它将调用Java Web服务并以JSON显示一些结果。 当Java Web服务未运行时,我收到以下错误消息:
{,“ Message”:“发生错误。”,“ ExceptionMessage”:“未实现该方法或操作。”,“ ExceptionType”:“ System.NotImplementedException”,“ StackTrace”:“位于ApiClientJavaWebService.Models.RestfulClient。 C:\\ Users \\ attsuap1 \\ Desktop \\ Server Project \\ ApiClientJavaWebService \\ ApiClientJavaWebService \\ Models \\ RestfulClient.cs:line 43 \\ r \\ n在C:\\ Users \\ attsuap1 \\ Desktop \\ ServerProject \\ ApiClientJavaWebService.Models.RestfulClient.d__3.MoveNext() Users \\ attsuap1 \\ Desktop \\ Server Project \\ ApiClientJavaWebService \\ ApiClientJavaWebService \\ Models \\ RestfulClient.cs:line 36 \\ r \\ n ---从上一个引发异常的位置开始的堆栈结束跟踪--- \\ r \\ n在System.Runtime .CompilerServices.TaskAwaiter.ThrowForNonSuccess(任务任务)\\ r \\ n在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(任务任务)\\ r \\ n在System.Runtime.CompilerServices.TaskAwaiter 1.GetResult()\\ r \\ n在C:\\ Users \\ attsuap1 \\ Des中的ApiClientJavaWebService.Controllers.AdditionController.d__1.MoveNext() ktop \\ Server Project \\ ApiClientJavaWebService \\ ApiClientJavaWebService \\ Controllers \\ AdditionController.cs:line 20 \\ r \\ n ---从上一个引发异常的位置开始的堆栈结束跟踪--- \\ r \\ n位于System.Runtime.CompilerServices.TaskAwaiter .ThrowForNonSuccess(任务任务)\\ r \\ n在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(任务任务)\\ r \\ n在System.Threading.Tasks.TaskHelpersExtensions.d__3`1.MoveNext()\\ r \\ n-- -从上一个引发异常的位置开始的堆栈结束跟踪--- \\ r \\ n在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(任务任务)\\ r \\ n在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(任务任务) )\\ r \\ n在System.Web.Http.Controllers.ApiControllerActionInvoker.d__0.MoveNext()\\ r \\ n ---从上一个引发异常的位置开始的堆栈跟踪--- \\ r \\ n在System.Runtime .CompilerServices.TaskAwaiter.ThrowForNonSuccess(任务任务)\\ r \\ n位于System.Runtime.CompilerServices.TaskAwaiter.Hand leNonSuccessAndDebuggerNotification(任务任务)\\ r \\ n位于System.Web.Http.Controllers.ActionFilterResult.d__2.MoveNext()\\ r \\ n ---从上一个引发异常的位置开始的堆栈跟踪--- \\ r \\ n在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(任务任务)\\ r \\ n在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(任务任务)\\ r \\ n在System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext ()“}
我如何更改此设置以使错误消息显示为{"The server is not running."}
?
这是我的代码:
AdditionClient.cs
public class RestfulClient
{
private static HttpClient client;
private static string BASE_URL = "http://localhost:8080/";
static RestfulClient()
{
client = new HttpClient();
client.BaseAddress = new Uri(BASE_URL);
client.DefaultRequestHeaders.Accept.Add(
new MediaTypeWithQualityHeaderValue("application/json"));
}
public async Task<string> addition(int firstNumber, int secondNumber)
{
try
{
var endpoint = string.Format("addition/{0}/{1}", firstNumber, secondNumber);
var response = await client.GetAsync(endpoint);
return await response.Content.ReadAsStringAsync();
}
catch (Exception e)
{
}
return null;
}
}
AdditionController.cs
public class AdditionController : ApiController
{
private RestfulClient restfulClient = new RestfulClient();
public async Task<IHttpActionResult> Get(int firstNumber, int secondNumber)
{
var result = await restfulClient.addition(firstNumber, secondNumber);
var resultDTO = JsonConvert.DeserializeObject<Temp>(result);
return Json(resultDTO);
}
}
有人请帮我。 提前非常感谢您。
我认为,您无法在要提取数据的服务器中管理抛出异常消息。 所以,为什么不过滤异常呢?
try
{
var endpoint = string.Format("addition/{0}/{1}", firstNumber, secondNumber);
var response = await client.GetAsync(endpoint);
return await response.Content.ReadAsStringAsync();
}
catch (Exception e)
{
if (e.InnerException.Message == "The method or operation is not implemented")
{
//Do something
}
}
我已经实现了我想要的。 我意识到try catch方法应该在控制器类而不是AdditionClient.cs类中。
这是我编辑的课程:
AdditionClient.cs
public class RestfulClient
{
private static HttpClient client;
private static string BASE_URL = "http://localhost:8080/";
static RestfulClient()
{
client = new HttpClient();
client.BaseAddress = new Uri(BASE_URL);
client.DefaultRequestHeaders.Accept.Add(
new MediaTypeWithQualityHeaderValue("application/json"));
}
public async Task<string> addition(int firstNumber, int secondNumber)
{
var endpoint = string.Format("addition/{0}/{1}", firstNumber, secondNumber);
var response = await client.GetAsync(endpoint);
return await response.Content.ReadAsStringAsync();
}
}
AdditionController.cs(关注try catch部分)
try
{
var result = await restfulClient.addition(firstNumber, secondNumber);
var resultDTO = JsonConvert.DeserializeObject<Temp>(result);
return Json(resultDTO);
}
catch (Exception e)
{
var result = @"Server is down";
return Ok(new { ErrorMessage = result });
}
当服务器未运行时,将在浏览器上显示的结果为{"ErrorMessage":"Server is down"}
。
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