Question

我是C＃的新手

我遇到了一些问题，我在Form1中通过Form.cs [Design]

创建了一些图片框

我想从Form1

访问图片框

所以我必须在其他类上创建一个对象来访问Form1.picturebox1

但我可以做对，有人可以帮助我

namespace RaceGame{
class Greyhound
{

    Form1 runner;

    public int StartingPosition = 13;
    public int RacetrackLength = 420;
    public PictureBox MyPictureBox = null;
    public int Location = 0;
    public Random Randomizer;

    public void Run()
    {

        runner.pictureDog1.Location = new Point(13, 100);
    }     
}

这是Form1

namespace RaceGame{public partial class Form1 : Form
{
    Greyhound racing = new Greyhound();
    public Form1()
    {
        InitializeComponent();
    }

    private void raceButton_Click(object sender, EventArgs e)
    {
        racing.Run();
    }



}

}

Answer 1

根据您提供的代码，您的Form1或“runner”未被分配。你有两个选择 - 1）让你的跑步者像这样公开

public Form1 runner;

这将允许您（在您的表单中，而不是您的班级）将表单分配给此属性

public class Form1
{
        protected void Form1_Load(object sender, EventArgs e)
        {
              Greyhound gh = new Greyhound();
              gh.runner = this;//this line here
              //then you can call gh.Run()
        }
}

另一种选择是使用构造函数，如此 -

class Greyhound
{

    Form1 runner;

    public int StartingPosition = 13;
    public int RacetrackLength = 420;
    public PictureBox MyPictureBox = null;
    public int Location = 0;
    public Random Randomizer;

    //here
    public Greyhound(Form1 form)
    {
        this.runner = form;
    }
    public void Run()
    {

        runner.pictureDog1.Location = new Point(13, 100);
    }     
}

这会将表单传递给greyhound类供您访问，然后在表单代码中 -

public class Form1
{
        protected void Form1_Load(object sender, EventArgs e)
        {
              Greyhound gh = new Greyhound(this);//pass the form as 'this'
              //then you can call gh.Run()
        }
}

编辑：根据您提供的表单代码 -

namespace RaceGame
{
    public partial class Form1 : Form
    {
         Greyhound racing = new Greyhound();
         public Form1()
         {
            InitializeComponent();
         }

         private void raceButton_Click(object sender, EventArgs e)
         {
              racing.runner = this;//assign property here
              racing.Run();
         }
    }
}

和Greyhound类

namespace RaceGame
{
    class Greyhound 
    {

        public Form1 runner;//make property public

        public int StartingPosition = 13;
        public int RacetrackLength = 420;
        public PictureBox MyPictureBox = null;
        public int Location = 0;
        public Random Randomizer;

        public void Run()
        {

            runner.pictureDog1.Location = new Point(13, 100);
        }      
    }
}

从另一个类VS2010访问Form1.picturebox1

1 个答案: