C#多个Windows表格无法引用

Question

我有2个Windows form1（monitor 1 - 1920x1080）和form2（monitor 2 - 1920x1080），form 1（monitor 1）有3个函数需要调用函数来自 form2（显示器 2）。

我必须在 Form1 中创建 form2 (screen2) 3 次，但它们不会是同一个 form2，对吗？有解决此问题的建议吗？

public partial class Form2 : Form
{
    // Variables
    private Form1 _ParentForm;    // Add this here

    // Constructor
    public Form2(Form1 parentForm)
    {
        InitializeComponent();
        _ParentForm = parentForm;   // Add this here
    }

    public void Rec_image()
    {
        // Form 2 Image
        PictureBox1.Show();
        PictureBox2.Hide();
    }

    public void Charging()
    {
        // Form 2 Image
        PictureBox6.Hide();
        PictureBox1.Hide();
        PictureBox2.Hide();
        PictureBox3.Hide();
        PictureBox4.Hide();
        PictureBox5.Hide();
        PictureBox7.Show();
    }
}

public partial class Form1 : Form
{
    private void Form1_Load(object sender, EventArgs e)
    {
        Form2 form2 = new Form2(this);
        form2.Show();
    }
    
    private async void Button2_Click(object sender, EventArgs e)
    {
        Form2 form2 = new Form2(this);
        form2.Rec_image();
    }
    
    private void Button1_Click(object sender, EventArgs e)
    {
        Form2 form2 = new Form2(this);
        form2.Charging();
    }
}

Answer 1

将对 Form2 实例的引用存储在 Form1 class 的字段中，您可以一次又一次地访问同一个实例。

public partial class Form1 : Form
{
    private Form2 _form2; // field

    private void Form1_Load(object sender, EventArgs e)
    {
        _form2 = new Form2(this);
        _form2.Show();
    }
    
    private async void Button2_Click(object sender, EventArgs e)
    {
        _form2.Rec_image();
    }
    
    private void Button1_Click(object sender, EventArgs e)
    {
        _form2.Charging();
    }

}

C#多个Windows表格无法引用

C# multiple Windows Forms cannot reference

c#

class

winforms