C＃中一个关于时间的问题

Question

  private void 插入时间tToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DateTime now = new DateTime();
            string yy=now.Year.ToString();
            string mm=now.Month.ToString();
            string dd=now.Day.ToString();
            string hh=now.Hour.ToString();
            string m=now.Minute.ToString();
            string s=now.Second.ToString();
            richTextBox1.Text = yy + @"/" + mm + @"/" + dd + @"/" + hh + @"/" + m +@"/" + s;
        }
问题：以上代码是当点快捷键时把时间写入文本框。可当点击时出现在文本框的  1/1/1/0/0/0，这是怎么回事？

Answer 1

   DateTime now = new DateTime(); 
应改为:
    DateTime now = DateTime.Now;

Answer 2

        private void 插入时间tToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.Text = DateTime.Now.ToString("yyyy/MM/dd/HH/mm/ss");
        } 

Answer 3

 private void richTextBox1_Click(object sender, EventArgs e) 
        { 
            DateTime now = DateTime.Now;
            string yy=now.Year.ToString(); 
            string mm=now.Month.ToString(); 
            string dd=now.Day.ToString(); 
            string hh=now.Hour.ToString(); 
            string m=now.Minute.ToString(); 
            string s=now.Second.ToString(); 
            richTextBox1.Text = yy + @"/" + mm + @"/" + dd + @"/" + hh + @"/" + m +@"/" + s; 
        } 

Answer 4

        private void 插入时间tToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.Text += DateTime.Now.ToString("yyyy/MM/dd/HH/mm/ss") + "\n";
        } 

Answer 5

richTextBox1.Text +=  DateTime.Now.ToString()+"\r";

Answer 6

private void 插入时间tToolStripMenuItem_Click(object sender, EventArgs e) 
        { 
            richTextBox1.Text += DateTime.Now.ToString("yyyy/MM/dd/HH/mm/ss") + "\n"; 
        }