[英]ASP.NET Core Razor Page create new for list always give System.NullReferenceException
[英]Api in .Net Core System.NullReferenceException
我刚开始学习 Api 并开始构建一个简单的。 我构建了这个 EmployeeController:
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
namespace ApiHandsOn1.Controllers
{
[Route("api/Employee")]
[ApiController]
public class EmployeeController : Controller
{
List<Employee> _employeeList = new List<Employee>()
{
new Employee()
{
Id=1,
Name= "abc def",
Salary=20000,
Permanent= true,
//Department= { Id = 1, Name = "Payroll"},
Skills ={new Skill{ Id= 1 , Value= "HTML"},new Skill{ Id= 2 , Value="CSS"},new Skill{ Id= 1 , Value= "JS"} },
DateOfBirth = new DateTime(01/03/2002)
},
new Employee()
{
Id=2,
Name= "ghi jkl",
Salary=25000,
Permanent= false,
//Department= { Id = 2, Name = "HR"},
Skills ={new Skill{ Id= 1 , Value= "HTML"},new Skill{ Id= 2 , Value="CSS"},new Skill{ Id= 1 , Value= "JS"} },
DateOfBirth = new DateTime(15/08/2005)
}
};
public EmployeeController()
{
}
private List<Employee> GetStandardEmployeeList()
{
return _employeeList;
}
// GET: EmployeeController
[HttpGet]
[Route("GetEmployees")]
[ProducesResponseType(StatusCodes.Status200OK)]
public List<Employee> GetStandard()
{
List<Employee> empList=GetStandardEmployeeList();
return empList;
}
}
}
我已经为各个班级建立了模型。 但是当我在 Swagger 上执行时,它会引发异常(在 _employeeList 处):
System.NullReferenceException:“对象引用未设置为 object 的实例。”
我错过了什么?
您需要像这样初始化Skills
属性:
Skills = new List<Skill>(){new Skill{}, new Skill{}}
正如@smoksnes 提到的,你应该把你的值放在DateTime
时间初始化中的文字之间
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