我的WebAPI项目,表时间表“值不能为空 r n参数名:实体(的ASP.NET Web API)
这里是表
CREATE TABLE [dbo].[TimeTable] (
[Id] INT IDENTITY (1, 1) NOT NULL,
[Company] NVARCHAR (MAX) NULL,
[INN] NVARCHAR (MAX) NULL,
[StartDay] NVARCHAR (MAX) NULL,
[StartPause] NVARCHAR (MAX) NULL,
[EndDay] NVARCHAR (MAX) NULL,
[EndPause] NVARCHAR (MAX) NULL,
[Today] DATE NULL,
PRIMARY KEY CLUSTERED ([Id] ASC)
);
和类
public partial class TimeTable
{
public int Id { get; set; }
public string Company { get; set; }
public string INN { get; set; }
public string StartDay { get; set; }
public string StartPause { get; set; }
public string EndDay { get; set; }
public string EndPause { get; set; }
public Nullable<System.DateTime> Today { get; set; }
}
这里是控制器将数据添加到表
[ResponseType(typeof(TimeTable))]
public IHttpActionResult PostStartWorkingDay(TimeTable startWorkingDay)
{
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
db.TimeTables.Add(startWorkingDay);
db.SaveChanges();
//return Json(new { Result = "Success", Message = "Saved Successfully"}, startWorkingDay);
return CreatedAtRoute("DefaultApi", new { id = startWorkingDay.Id }, startWorkingDay);
}
当我把从邮递员post请求
这里是请求主体
{"Company":"123","INN":"123","StartDay":"15:8:2017T16:55:38"}
都很好,而且数据在写入
,我得到这个响应
{
"Id": 1013,
"Company": "123",
"INN": "123",
"StartDay": "15:8:2017T16:55:38",
"StartPause": null,
"EndDay": null,
"EndPause": null,
"Today": null
}
但我也尝试了使用xamarin应用程序的请求锐
这里是代码
var client = new RestClient("http://timetrackingbackend.azurewebsites.net/api");
var request = new RestRequest("/StartWorkingDays", Method.POST);
request.AddQueryParameter("Company", "12366");
request.AddQueryParameter("INN", "12366");
request.AddQueryParameter("StartDay", "8/14/2017T14.48");
var response = client.Execute(request);
string content = response.Content;
而且我有这个错误
{"Message":"An error has occurred.","ExceptionMessage":"Value cannot be null.\r\nParameter name: entity","ExceptionType":"System.ArgumentNullException","StackTrace":" at System.Data.Entity.Utilities.Check.NotNull[T](T value, String parameterName)\r\n at System.Data.Entity.DbSet`1.Add(TEntity entity)\r\n at trackingappbackend.Controllers.StartWorkingDaysController.PostStartWorkingDay(TimeTable startWorkingDay) in C:\\Users\\nemes\\Documents\\Visual Studio 2017\\Projects\\trackingappbackend\\trackingappbackend\\Controllers\\StartWorkingDaysController.cs:line 48\r\n at lambda_method(Closure , Object , Object[])\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"}
我怎样才能解决这个问题,因为它看起来像请求是一样的吗?
尝试发送数据作为JSON –
但它发出像JSON?不? @JosueMartinez –
我认为它是作为参数发送的 –