我已经使用MySQL
数据库在visual studio 2015中创建了一个API。我有两种GET方法。一个获取所有记录,另一个通过ID获取记录。第一种方法是完美的,但第二种方法引发了一个例外。值' r n'的格式无效。“,”ExceptionType“:”System.FormatException
{"Message":"An error has occurred.","ExceptionMessage":"The format of value '\r\n' is invalid.","ExceptionType":"System.FormatException","StackTrace":" at System.Net.Http.Headers.MediaTypeHeaderValue.CheckMediaTypeFormat(String mediaType, String parameterName)\r\n at System.Net.Http.Headers.MediaTypeHeaderValue..ctor(String mediaType)\r\n at System.Net.Http.HttpRequestMessageExtensions.CreateResponse[T](HttpRequestMessage request, HttpStatusCode statusCode, T value, String mediaType)\r\n at WebServiceMySQL.Controllers.MetersInfoController.Get(Int32 id) in E:\\Work\\NEW API\\WebServiceMySQL\\WebServiceMySQL\\Controllers\\MetersInfoController.cs:line 33"}
下面是我的代码
类
public partial class meters_info_dev
{
public int id { get; set; }
public string meter_msn { get; set; }
public string meter_kwh { get; set; }
}
控制器
public MeterEntities mEntities = new MeterEntities();
// GET all
public HttpResponseMessage Get()
{
try
{
return Request.CreateResponse(HttpStatusCode.Found, mEntities.meters_info_dev.ToList());
}
catch (Exception ex)
{
return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
}
}
// GET by ID
public HttpResponseMessage Get(int id)
{
try
{
return Request.CreateResponse(HttpStatusCode.Found, mEntities.meters_info_dev.SingleOrDefault(m => m.id == id), Environment.NewLine);
}
catch (Exception ex)
{
return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
}
}
WebApiConfig
// Web API configuration and services
// Configure Web API to use only bearer token authentication.
config.SuppressDefaultHostAuthentication();
config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));
config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));
config.Formatters.Remove(config.Formatters.XmlFormatter);
// Web API routes
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
在调试Get(int id)
部分,我发现了一个查询是
SELECT Extent1.id, Extent1.meter_msn, Extent1.meter_kwh FROM meters_info_dev AS Extent1
并运行此查询,我发现了以下结果
我不知道有什么真正的问题,我坚持它。
任何帮助将不胜感激。
@EpicKip实际上在代码中有一个'Environment.NewLine',它也是错误发生的地方。 – Dirk