Parameter Binding in ASP.NET Web API

https://docs.microsoft.com/en-us/aspnet/web-api/overview/formats-and-model-binding/parameter-binding-in-aspnet-web-api

Mike Stall wrote a good series of blog posts about Web API parameter binding:

• How Web API does Parameter Binding
• MVC Style parameter binding for Web API
• How to bind to custom objects in action signatures in MVC/Web API
• How to create a custom value provider in Web API
• Web API Parameter binding under the hood

Can't bind multiple parameters ('header' and 'parameters') to the request's content.

2019-01-22 16:43:53.812+08:00 ERROR [12]:
System.InvalidOperationException: Can't bind multiple parameters ('header' and 'parameters') to the request's content.
at System.Web.Http.Controllers.HttpActionBinding.ExecuteBindingAsync(HttpActionContext actionContext, CancellationToken cancellationToken)
at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__15.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__15.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at LISA.WebApi.Chile.Helper.CustomMessageHandler.<SendAsync>d__3.MoveNext() in C:\Users\clu\source\repos\Edenred\LISA_6.0.0.0\LISA.CMS.Chile\LISA.WebApi.Chile\Helper\CustomMessageHandler.cs:line 48
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.Http.HttpServer.<SendAsync>d__24.MoveNext()

https://stackoverflow.com/questions/51365048/exceptionmessage-cant-bind-multiple-parameters-tenant-and-certificatefile

https://stackoverflow.com/questions/44690905/cant-bind-multiple-parameter-to-the-requests-content-in-web-api-and-angular?rq=1

public string Save(JObject EmpData)
{
dynamic json = EmpData;
A1 Emp=json.Emp.ToObject<A1>();
List<A2> EmpMarks=json.ToObject<List<A2>>();
}