如何在Form 1中從Form2調用方法

Question

我在表格2中有一個方法

public void set_location(int lx, int ly)
    {
        this.Location = new Point(lx, ly);
    }

發生此事件時需要從Form1調用哪個

 private void Form1_LocationChanged(object sender, EventArgs e)
    {
        loc_x = this.Location.X;
        loc_y = this.Location.Y;

    }

我將Form2初始化為新線程

   private void Form1_Load(object sender, EventArgs e)
    {

        Thread newThread = new Thread((ThreadStart)delegate { Application.Run(new Form2()); });
        newThread.Start(); 
    }

我如何調用方法set_location（x，y）; 來自Form1嗎？

Answer 1

首先，第二個線程沒有任何好處。

最簡單的方法是在form2的構造函數中傳遞對form1的引用

private void Form1_Load(object sender, EventArgs e)
{    
    Form2 form2 =new Form2();
    form2.Show(this);
}


private Form1 Parent {get;set;}
public Form2(Form1 form)
{
    this.Parent = form;
}

然后您可以正常引用其屬性

this.Parent.Form1_LocationChanged(this, null);

---

為了回應您的評論，請在您的form1中也保留對Form2的引用，然后調用

private void Form1_LocationChanged(object sender, EventArgs e)
{
    ...
    this.form2.set_location(loc_x, loc_y);
}

Answer 2

public static void set_location(int lx, int ly)
{
    this.Location = new Point(lx, ly);
}

請告訴我這項工作

Answer 3

Program.cs中

static class Program
    {
        public static Form GlobalMainForm;

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            GlobalMainForm = new Form1();
            Application.Run(GlobalMainForm);
        }
    }

Form1.cs的

public partial class Form1 : Form
    {
        public Form2 Form2GlobalInstance { get; set; }
        public Form1()
        {
            InitializeComponent();
            Form2GlobalInstance = new Form2();
            Thread newThread = new Thread((ThreadStart)delegate { Application.Run(Form2GlobalInstance); });
            newThread.Start();
            Load += delegate
            {
                var frm2Location = Form2GlobalInstance.GetLocation();
                MessageBox.Show("location.x=" + frm2Location.X + " location.y=" + frm2Location.Y);
            };
        }

    }

Form2.cs

public partial class Form2 : Form
{

    public Form2()
    {
        InitializeComponent();
    }

    public Point GetLocation()
    {
        return new Point(Location.X, Location.Y);
    }

    private void Form2_Load(object sender, EventArgs e)
    {
        MessageBox.Show("location.x=" + Program.GlobalMainForm.Location.X + " location.y=" + Program.GlobalMainForm.Location.Y);
    }
}

更新1：

static class Program
{
    public static Form MainForm;

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        MainForm = new Form1();
        Application.Run(MainForm);
    }
}

From2：

public void Form1_LocationChanged(object sender, EventArgs e)
{
        loc_x =Program.MainForm.Location.X;
        loc_y = Program.MainForm.Location.Y;    
}

或在新的Thread LINK中運行方法的方法