MessageBox 在 C Sharp 中不显示任何文本

Question

我的消息框应该会弹出并询问用户是否要下载应用程序的新版本，如果他们说不，它会退出并告诉他们需要下载新副本才能继续。如果他们说是，它会打开浏览器访问上述网址。现在，弹出消息框，什么也没有出现。但是，每当我将代码提供给我的朋友并且他尝试过时，它就起作用了。这里有什么问题？我使用 Microsoft Framework 4.0 编译。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ProjectTest
{
   public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        Form1_FormClosing();
    }

    private void Form1_FormClosing()
   {
   const string message =
    "There's an updated version of this program available. Would you like to download now?";
const string caption = "Please update";
var result = MessageBox.Show(message, caption,
                             MessageBoxButtons.YesNo,
                             MessageBoxIcon.Question);

// If the no button was pressed ...
if (result == DialogResult.No)
{
    MessageBox.Show("Program will close now. If you want to use this program please update to the newest version.", "Please update");
    this.Close();
}
else if (result == DialogResult.Yes)
{
    System.Diagnostics.Process.Start("http://www.google.com");
    this.Close();
}
}

    }
}

Answer 1

试试这个：

 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ProjectTest
{
   public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        this.Close();
    }

    private void Form1_FormClosing()
   {
   const string message =
    "There's an updated version of this program available. Would you like to download now?";
const string caption = "Please update";
var result = MessageBox.Show(message, caption,
                             MessageBoxButtons.YesNo,
                             MessageBoxIcon.Question);

// If the no button was pressed ...
if (result == DialogResult.No)
{
    MessageBox.Show("Program will close now. If you want to use this program please update to the newest version.", "Please update");
                e.Cancel = false;
}
else if (result == DialogResult.Yes)
{
    System.Diagnostics.Process.Start("http://www.google.com");
                e.Cancel = false;
}
}

    }
}