c# 单例窗口及其关闭处理

Form2.cs

public partial class Form2 : Form
{
    //唯一实例
    private static Form2 obj = null;
    
    private Form2()
    {
        //初始化控件（自动生成）
        InitializeComponent();
    }

    //设置标签文字内容
    public void setHelpInfo(String str)
    {
        helpInfo.Text = str;
    }

    //返回唯一实例
    public static Form2 GetForm2()
    {
        return obj;
    }

    //静态方法
    static Form2()
    {
        if(obj == null)
        {
            obj = new Form2();
        }
    }
}

关闭窗口不释放资源.cs

protected override void Dispose(bool disposing)
{
    Hide();
}

调用.cs

private void 查看帮助ToolStripMenuItem_Click(object sender, EventArgs e)
{
    Form2 form2 = Form2.GetForm2();
    form2.setHelpInfo("This Help Info.");
    form2.Show();
}