c# - 发生错误：：“EmployeeDataAccess.EmployeeDBEntities”：在 using 语句中使用的类型必须隐式转换为“System.IDisposable”

Question

public class EmployeesController : ApiController
{
    public IEnumerable<Employee> Get()
    {
        using (EmployeeDBEntities entities = new EmployeeDBEntities())
        {
            return entities.Employees.ToList();
        }
    }
    public IEnumerable<Employee> Get(int id)
    {
        using (EmployeeDBEntities entities = new EmployeeDBEntities())
        {
            return entities.Employees.FirstOrDefault(e => e.ID == id);
        }
    }
} 

标签： c#asp.netasp.net-web-api

Answer 1

您的 EmployeeDBEntities 类必须实现 IDisposible 才能使用using。

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/using-statement

或者，不要使用using

EmployeeDBEntities entities = new EmployeeDBEntities();
return entities.Employees.ToList();