c# - 无法使用 Entity Framework 和 ASP.NET MVC 从 Models.Class 转换为 DbContext.Class

Question

我正在使用数据库优先方法，我想将一些数据插入数据库。我正在使用这段代码:

public ActionResult Create(StudentDetails studentDetails)
{
    using (StudentRecordManagementEntities1 obj = new StudentRecordManagementEntities1())
    {
         obj.StudentDetails.Add(studentDetails);  //throws error
    }
}

模型类:

public class StudentDetails
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public string Name { get; set; }
    public Nullable<long> ContactNumber { get; set; }
    public string Address { get; set; }
    public decimal Fees { get; set; }
    public bool isPaid { get; set; }
}

错误详情:

Error CS1503 Argument 1: cannot convert from 'StudentRecordManagement.Models.StudentDetails' to 'StudentRecordManagement.Models.StudentDetail' StudentRecordManagement*

如果您需要更多详细信息，请告诉我。

Answer 1

看起来您的模型类是 StudentRecordManagement.Models.StudentDetail，但是您插入的是 StudentRecordManagement.Models.StudentDetails。所以你可以做的是为你的数据库模型提供必要的类型:

public ActionResult Create(StudentDetails studentDetails)
{
    using (StudentRecordManagementEntities1 obj = new StudentRecordManagementEntities1())
    {
        var studentDetail = new StudentRecordManagement.Models.StudentDetail {
         Name = studentDetails.Name,
         // the other code is omitted for the brevity
     };
     obj.StudentDetails.Add(studentDetail);  //
}