Post Api Error - Value cannot be null

I am getting this error -

{ "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 ProjectManagement.Controllers.EmployeesController.PostEmployee(Employee employee) in C:\\Users\\jagji\\documents\\visual studio 2015\\Projects\\ProjectManagement\\ProjectManagement\\Controllers\\EmployeesController.cs:line 142" }

Below values i entered in PostMan -

[ { "Id": 10, "Name": "Mark 10", "DepartmentId": 1, "Email": "[email protected]", "Active": "Y", "Gender":"Male" }]

public partial class Employee {
public int ID {
get;
set;
}
public string Name {
get;
set;
}
public string Email {
get;
set;
}
public string Gender {
get;
set;
}
public Nullable < int > Salary {
get;
set;
}
public Nullable < int > DepartmentId {
get;
set;
}
public string Active {
get;
set;
}
public Nullable < System.DateTime > CreatedOn {
get;
set;
}
public Nullable < System.DateTime > UpdatedOn {
get;
set;
} //public Department Department { get; set; } public virtual Department Department { get; set; } }

Thanks

2 Replies

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Rijwan Ansari5y ago
It seems like you are passing array and your post method requires single value
[ { "Id": 10, "Name": "Mark 10", "DepartmentId": 1, "Email": "[email protected]", "Active": "Y", "Gender":"Male" }]
Above value is in array format.
Pass in this way:
var employee = { "Id": 10, "Name": "Mark 10", "DepartmentId": 1, "Email": "[email protected]", "Active": "Y", "Gender":"Male" };

data = json.stringify(employee);
0
Sachin Singh5y ago
put a debugger in your api post method and check whether the values being sent from postman are mapping to your method parameters or not.
also use if(modelState.IsValid) in api to ensure you have any model validation error.
0