Question

我是Windows窗体的新手。我正在尝试实例化公共类的对象，并在按下button1时调用方法drawBoard()。方法drawBoard()我想通过它设置pictureBox2的属性。但是代码没有用。

  public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();                                                                   
        }

        public class gameBoard :Form1
        {
            public void drawBoard()
            {
                pictureBox2.ImageLocation = @"E:\My Data\DoCx\CS\3rd Sem\OOP\proj\images\a.png";
                pictureBox2.SizeMode = PictureBoxSizeMode.Zoom;                      
            }            
        }

        private void button1_Click(object sender, EventArgs e)
        {             
            gameBoard a = new gameBoard();
            a.drawBoard();               
        }      
}

还尝试以其他两种方式实现这一点：

 public partial class Form1 : Form
    {
 public Form1()
        {
            InitializeComponent();

            pictureBox2.ImageLocation = @"E:\My Data\DoCx\CS\3rd Sem\OOP\proj\images\a.png";
            pictureBox2.SizeMode = PictureBoxSizeMode.Zoom;
            pictureBox2.BackColor = Color.Transparent;                               
        }    
 }

和

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();         
        }

        private void button1_Click(object sender, EventArgs e)
        {            
            pictureBox2.ImageLocation = @"E:\My Data\DoCx\CS\3rd Sem\OOP\proj\images\a.png";
            pictureBox2.SizeMode = PictureBoxSizeMode.Zoom;   
        }
    }

两者都有效。代码运行时直接加载图像。并且当按钮1以第二方式按下时。我想知道如何在用户定义的类的方法中定义时调用pictureBox属性。

Answer 1

如果仔细观察，那么gameBoard被定义为Form1内的嵌套类，它也继承自Form控件，这没有意义。您可能希望将类定义在外部（可能在单独的文件中）

    public class gameBoard
    {
        private PictureBox _box;
        public gameBoard(PictureBox box)
        {
            _box = box;
        }
        public void drawBoard()
        {
            _box.ImageLocation = @"E:\My Data\DoCx\CS\3rd Sem\OOP\proj\images\a.png";
            _box.SizeMode = PictureBoxSizeMode.Zoom;                      
        }            
    }

在表单类下实例化类的对象

1 个答案: