c# - 从派生表单访问基本表单的控件时有什么更好的主意

Question

我不知道应该如何访问 ase 表单的控件。

1. 将控件的访问修饰符设置为“ protected ”。

   public class BaseForm
   {
       protected System.Windows.Forms.Button button1;
       protected System.Windows.Forms.Label label1;
   }
   
   public class Form2 : BaseForm
   {
       public Form2()
       {
           button1.Text = "J. Doe";
           label1.Text = "Kim";
       }
   }
   

2. 保持私有(private)控制权并创建属性(property)

   public class BaseForm
   {
       private System.Windows.Forms.Button button1;
       private System.Windows.Forms.Label label1;
   
       public Button Button1
       {
           get { return button1; }
       }
       public Label Lable1
       {
           get { return label1; }
       }
   
   }
   
   public class Form2 : BaseForm
   {
       public Form2()
       {
           Button1.Text = "J. Doe";
           Lable1.Text = "Kim";
       }
   }
   

哪个更好？

Answer 1

Protected 告诉 VS 这些元素只能被声明它们的类的子类访问

public class BaseForm
{

    //All BaseForm child classes will have access to the protected elements
    protected System.Windows.Forms.Button button1;
    protected System.Windows.Forms.Label label1;
}

public class Form2 : BaseForm
{
    public Form2()
    {
        button1.Text = "J. Doe";
        label1.Text = "Kim";
    }
}

在你的代码中，BaseForm是一个父类，所以继承父类的方法是最好的选择。

public class BaseForm
{
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.Label label1;

    public Button Button1
    {
        get { return button1; }
    }
    public Label Lable1
    {
        get { return label1; }
    }

}

public class Form2 : BaseForm
{
    public Form2()
    {
        Button1.Text = "J. Doe";
        Lable1.Text = "Kim";
    }
}

这里用到访问器，一般用来给全局变量传递参数，重赋局部变量的值，用来在两个独立的类之间传递参数

如果你总是要将一个类扩展到 BaseForm，请使用 proted，如果你想从任何地方调用变量，请使用访问描述符 (get; set;)