窗口创建句柄时错误

Question

下面是我的代码，我在一个窗体中创建了两个system.timer.timer，但是当关闭窗体时，如果任意一个timer.Enabled=true，则会报错，“用户代码未处理Win32Exception：窗口创建句柄时错误”，报错位置是两个timer的Elapsed事件（两个事件都有可能）中的this.textBox3.Text = hour1.ToString()这句话（就是为textbox.text赋值这句话），以下是代码：
private void button9_Click(object sender, EventArgs e)
        {
            
                timer2.Interval = 1;//表示每1ms刷新一次时钟，每次刷新50个毫秒
                timer2.Elapsed += new ElapsedEventHandler(timer2_Elapsed);
                timer2.AutoReset = true;
                timer2.Enabled = true;                timer4.Interval = 1;//表示每1ms刷新一次时钟，正常是次刷新1个毫秒
                timer4.Elapsed += new ElapsedEventHandler(timer4_Elapsed);
                timer4.AutoReset = true;
                timer4.Enabled = true;
          
        }        void timer2_Elapsed(object sender, ElapsedEventArgs e)
        {
            if (second_mile < 1000)
            {
                second_mile += 50;
                this.textBox_Sec.Text = second.ToString();
                this.textBox_Min.Text = minute.ToString();
                this.textBox_Hour.Text = hour.ToString();
                this.textBox_milesecond.Text = second_mile.ToString();
            }
            else
            {
                second_mile = 0;
                if (second < 59)
                {
                    second += 1;
                    this.textBox_Sec.Text = second.ToString();
                    this.textBox_Min.Text = minute.ToString();
                    this.textBox_Hour.Text = hour.ToString();
                    this.textBox_milesecond.Text = second_mile.ToString();
                }
                else
                {
                    second = 0;
                    if (minute < 59)
                    {
                        minute += 1;
                        this.textBox_Sec.Text = second.ToString();
                        this.textBox_Min.Text = minute.ToString();
                        this.textBox_Hour.Text = hour.ToString();
                        this.textBox_milesecond.Text = second_mile.ToString();
                    }
                    else
                    {
                        minute = 0;
                        hour += 1;
                        this.textBox_Sec.Text = second.ToString();
                        this.textBox_Min.Text = minute.ToString();
                        this.textBox_Hour.Text = hour.ToString();
                        this.textBox_milesecond.Text = second_mile.ToString();
                    }
                }
            }
        }
        void timer4_Elapsed(object sender, ElapsedEventArgs e)
        {
            if (second_mile1 < 1000)
            {
                second_mile1 += 1;
                this.textBox3.Text = hour1.ToString();
                this.textBox4.Text = minute1.ToString();
                this.textBox5.Text = second1.ToString();
                this.textBox6.Text = second_mile1.ToString();
            }
            else
            {
                second_mile1 = 0;
                if (second1 < 59)
                {
                    second1 += 1;
                    this.textBox3.Text = hour1.ToString();
                    this.textBox4.Text = minute1.ToString();
                    this.textBox5.Text = second1.ToString();
                    this.textBox6.Text = second_mile1.ToString();
                }
                else
                {
                    second1 = 0;
                    if (minute1 < 59)
                    {
                        minute += 1;
                        this.textBox3.Text = hour1.ToString();
                        this.textBox4.Text = minute1.ToString();
                        this.textBox5.Text = second1.ToString();
                        this.textBox6.Text = second_mile1.ToString();
                    }
                    else
                    {
                        minute1 = 0;
                        hour1 += 1;
                        this.textBox3.Text = hour1.ToString();
                        this.textBox4.Text = minute1.ToString();
                        this.textBox5.Text = second1.ToString();
                        this.textBox6.Text = second_mile1.ToString();
                    }
                }
            }
            
        }

Answer 1

关闭窗体前，先将timer设置为false，因为关闭窗体时会销毁对象，你timer再访问的话就报错

Answer 2

我在 Form1_FormClosed 和 Form1_Closing中都将timer设置为false了，可还是不行代码如下：为什么啊？有没有窗体关闭前的事件啊？？？
 private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            this.Dispose();
            timer2.Enabled = false;
            timer4.Enabled = false;
            
        }
 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            this.Dispose();
            timer2.Enabled = false;
            timer4.Enabled = false;
        }

Answer 3

即便是先设置timer的Enabled值，再dispose也没用的，不是这的问题。