c# - 主窗体运行时隐藏窗体也在启动时隐藏

Question

我有一个关于管理计算机时间使用的小项目。表格1：

public partial class Form1 : Form
{
    private Timer t = new Timer();
    public static int counter = 60;
    public Form1()
    {
        InitializeComponent();
        t.Tick += new EventHandler(Timer_Tick);
        t.Interval = 1000;
        t.Enabled = true;                       
        t.Start();
        Form2 TheForm2 = new Form2();
        TheForm2.ShowDialog();
    }

    void Timer_Tick(object sender, EventArgs e)
    {
        counter -= 1;
        if (counter==20)
        {
            MessageBox.Show("Time remaining "+counter.ToString());
        }

    }
}

和表格2：

public partial class Form2 : Form
{
    public Form2()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        int userVal = int.Parse(textBox2.Text);
        Form1.counter += userVal;
    }

    private void textBox2_TextChanged(object sender, EventArgs e)
    {

    }

    private void button2_Click(object sender, EventArgs e)
    {
        textBox1.Text = Form1.counter.ToString();
    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {

    }
}

最终程序：

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

我试图让这个应用程序在 Windows 启动时运行并且 Form1 是隐藏的。但我也想让 form2 不可见。它只在用户执行应用程序时显示。我该如何解决？我只是把这个 exe 放到文件夹 start up 中，让它在启动时运行。（我会尝试用 Registry 来制作）

标签： c#windowsforms

Answer 1

如果我理解正确，您想控制一个表单从另一个表单的可见性。为此，请使用.Visible表单的属性。例如：

 public Form1()
    {
        InitializeComponent();
        t.Tick += new EventHandler(Timer_Tick);
        t.Interval = 1000;
        t.Enabled = true;                       
        t.Start();
        Form2 TheForm2 = new Form2();
        TheForm2.ShowDialog();
        TheForm2.Visible = false;
    }

你这样做的方式还有其他问题，但我想你会随着时间的推移解决这些问题，或者发布其他问题:)

编辑： 好的，我已经修改了您的代码以演示如何使其工作。该代码为我编译并运行，并展示了如何使 form2 最初不可见，然后在 10 秒后使其可见。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TwoForms
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            // If you do it this way you'll have to stop the application yourself
            // Form1 TheForm = new Form1();  
            // Application.Run();

            Application.Run(new Form1());   // When Form1 is closed, the application will exit.
        }
    }
}

表格1：

using System;
using System.Windows.Forms;

namespace TwoForms
{
    public partial class Form1 : Form
    {
            private Timer t = new Timer();
            public static int counter = 60;
            public Form TheForm2;
            public Form1()
            {
                InitializeComponent();
                t.Tick += new EventHandler(Timer_Tick);
                t.Interval = 1000;
                t.Enabled = true;
                t.Start();
                this.Show(); // show Form1 just so we know it's really there
                TheForm2 = new Form2();
                // TheForm2.ShowDialog(); // Don't do this unless you really want a modal dialog
                TheForm2.Show();
                TheForm2.Visible = false; // A timer tick will later set visible true
            }
        void Timer_Tick(object sender, EventArgs e)
        {
            counter -= 1;
            if (counter == 50)
                TheForm2.Visible = true;
            if (counter == 40)
                MessageBox.Show("Time remaining " + counter.ToString());
        }
    }
}

表格2：

using System;
using System.Windows.Forms;

namespace TwoForms
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int userVal = int.Parse(textBox2.Text);
            Form1.counter += userVal;
        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = Form1.counter.ToString();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }
    }
}