如何在不创建新实例（表单）的情况下切换实例（表单）？

Question

我知道如何将表单切换为表单，但问题是从Form B切换到Form A时。它始终创建Form A的新实例。

我该如何避免这种行为？

Answer 1

您要找的是Singleton。

对于一个非常基本的方法，你可以采取这个：

public partial class Form1 : Form
{
    public static Form1 Instance { get; set; } //Create an Instance Object of your Window

    public Form1()
    {
        InitializeComponent();
    }

    //Your call to open the Window
    private void OpenForm2()
    {
        if (Form2.Instance == null)//Check if Form2 has already been created
        {
            //if not: go create a new one !
            Form2.Instance = new Form2();
        }
        //Instance of Form2 is already created => open that one            
        Form2.Instance.Show();            
    }
}

public partial class Form2 : Form
{
    public static Form2 Instance { get; set; }

    public Form2()
    {
        InitializeComponent();
    }
}