Question

我在这里读到这个问题：

Is there a way to override the empty constructor in a class generated by LINQtoSQL?

通常我的构造函数看起来像：

 public User(String username, String password, String email, DateTime birthday, Char gender)
    {
        this.Id = Guid.NewGuid();
        this.DateCreated = this.DateModified = DateTime.Now;
        this.Username = username;
        this.Password = password;
        this.Email = email;
        this.Birthday = birthday;
        this.Gender = gender;
    }

但是，正如在该问题中所读到的，您希望使用部分方法OnCreated（）来分配值而不是覆盖默认构造函数。好的，所以我明白了：

partial void OnCreated()
{       
        this.Id = Guid.NewGuid();
        this.DateCreated = this.DateModified = DateTime.Now;
        this.Username = username;
        this.Password = password;
        this.Email = email;
        this.Birthday = birthday;
        this.Gender = gender;
}

然而，这给了我两个错误：

Partial Methods must be declared private.
Partial Methods must have empty method bodies.

好吧我将其更改为Private Sub OnCreated()以删除这两个错误。但是我仍然坚持......我如何通过普通的自定义构造函数传递它的值？另外我在VB中这样做（因为我知道大多数人知道/更喜欢C＃），所以会对此产生影响吗？

Answer 1

您无法将值传递到OnCreated。您链接的问题涉及覆盖默认构造函数的行为。听起来你想要使用这样的参数化构造函数：

Public Sub New(username as String, password as String, email as String, birthday as DateTime, gender as Char)
  User.New()

  Me.Id = Guid.NewGuid()
  Me.DateCreated = this.DateModified = DateTime.Now
  Me.Username = username
  Me.Password = password
  Me.Email = email
  Me.Birthday = birthday
  Me.Gender = gender
End Sub

您想创建这样的新用户：

 Dim u as User = new User()

或者像这样：

 Dim u as User = new User("Name", "Password", "Email", etc)

Answer 2

使用VB时，不应将实现标记为Partial，而应将其标记为Private。请看以下示例：

Private Sub OnCreated()
    ' Your code here'
End Sub

部分类的LINQ to SQL自定义构造函数？

2 个答案: