Question

我正在尝试使用实体框架返回.net webapi中具有三列的员工，但返回错误，提示无法将pf匿名类型转换为emp ..我所缺少的内容

public List<EMPLOYEE_DTLS> GetLoginInfo(string UserId)
{
    var result = (from emp in db.EMPLOYEE_DTLS
                  where emp.UserId == UserId
                  select new
                  {
                      emp.FullName,
                      emp.Role,
                      emp.Designation
                   }).ToList();

    return result;
}

Answer 1

您的方法返回List<EMPLOYEE_DTLS>，但是您正在尝试返回匿名类型的列表。

假设您的EMPLOYEE_DTLS类具有属性FullName，Role和Designation，请更改您选择的类型：

public List<EMPLOYEE_DTLS> GetLoginInfo(string UserId)
{
   var result = (from emp in db.EMPLOYEE_DTLS
                 where emp.UserId == UserId
                 select new EMPLOYEE_DTLS
                 {
                    FullName = emp.FullName,
                    Role = emp.Role,
                    Designation = emp.Designation
                 }).ToList();

   return result;
}

Answer 2

您应该使用DTO返回列表。

public class EmployeeDTO
{
       public string FullName {get; set;}
       public string Role {get; set;}
       public string Designation {get; set;}
}


public List<EmployeeDTO> GetLoginInfo(string UserId)
{
    var result = (from emp in db.EMPLOYEE_DTLS
                   where emp.UserId == UserId
                   select new EmployeeDTO
                   {
                      FullName = emp.FullName,
                      Role = emp.Role,
                      Designation = emp.Designation
                   }).ToList();

    return result;
 }

实体框架和webapi中的列表

2 个答案: