Web API POST请求添加新记录，但是所有属性都设置为NULL

Question

我有一个Web API POST请求，它应该使用在主体中找到的JSON属性将新记录添加到特定的表中。然而，当输入所有属性(我认为这是正确的(时，请求最终会添加一个新记录，但无论出于什么原因，所有属性都会设置为NULL？

以下是我的API帖子请求：

/*Define URL endpoint for adding a single role*/
[System.Web.Http.Route("api/Roles/addRole")]
/*HttpPost header, ensures only the usage of POST requests*/
[System.Web.Mvc.HttpPost]
/*Main return new list with added role*/
public List<dynamic> addRole([FromBody] Roles roles)
{
if (roles != null)
{
/*Create an instance of the UltimateDB*/
UltimateDBEntities db = new UltimateDBEntities();
/*Optimize memory usage by disabling proxy creation*/
db.Configuration.ProxyCreationEnabled = false;
db.Roles.Add(roles);
db.SaveChanges();
return getAllRoles();
}
else
{
return null;
}

}

以上应该将单个记录添加到"；角色"表，使用用户输入的正文数据(JSON(。我已经使用Postman对此进行了测试，返回的只是一个新记录，它的所有属性都设置为NULL。

例如，我将输入以下内容：

{
"Name": "Lab Employee",
"Description": "User only has read rights",
"Tenant_rental": 1,
"Property_Module": 0,
"Employee_Management": 0,
"Reports": 1,
"administration": 1,
"user_Password_access": 0,
"Building_Management": 0,
"Credit_Bureau": 1
}

把它作为我的新唱片：

{
"ID": 23,
"Name": null,
"Description": null,
"Tenant_rental": null,
"Property_Module": null,
"Employee_Management": null,
"Reports": null,
"administration": null,
"user_Password_access": null,
"Building_Management": null,
"Credit_Bureau": null
}

我的角色类别：

namespace U18043039_HW1.Models
{
using System;
using System.Collections.Generic;

public partial class Roles
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public Roles()
{
this.User_Table = new HashSet<User_Table>();
}

public int Role_ID { get; set; }
public string Role_Name { get; set; }
public string Role_Description { get; set; }
public Nullable<bool> Role_Tenant_rental { get; set; }
public Nullable<bool> Role_Property_Module { get; set; }
public Nullable<bool> Role_Employee_Management { get; set; }
public Nullable<bool> Role_Reports { get; set; }
public Nullable<bool> Role_administration { get; set; }
public Nullable<bool> Role_user_Password_access { get; set; }
public Nullable<bool> Role_Building_Management { get; set; }
public Nullable<bool> Role_Credit_Bureau { get; set; }

[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<User_Table> User_Table { get; set; }
}
}

Answer 1

使用此数据进行测试：

{
"Role_Name": "Lab Employee",
"Role_Description": "User only has read rights",
"Role_Tenant_rental": True,
"Role_Property_Module":False,
... and so on
}