winfrom 判断textbox

Question

我想在textbox重判断只允许输入数字和冒号，且第一个不允许为冒号该怎么实现

Answer 1

private   void   textBox1_TextChanged(object   sender,   EventArgs   e) 
                { 
                        Regex   r   =   new   Regex(@ "^\d*$|\:"); 
                        if   (!r.IsMatch(this.textBox1.Text)) 
                        { 
                                textBox1.Text=s;//恢复 
                                textBox1.SelectionStart   =   s.Length; 
                        } 
                        else 
                                s=textBox1.Text; 
                        
                }

Answer 2

 Regex r = new Regex(@ "^\d*$|\:");  
  if (!r.IsMatch(this.textBox1.Text))  
  {  
  textBox1.Text=s;//恢复  
  textBox1.SelectionStart = s.Length;  
  }  
  else  
  s=textBox1.Text;

Answer 3

 private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if ((e.KeyChar >= '0' && e.KeyChar <= '9') || e.KeyChar == 8)
            {                e.Handled = false;
            }
            else if (e.KeyChar == 58)
            {
                if (textBox1.Text.Length > 0)
                {
                    e.Handled = false;
                }
                else
                {
                    e.Handled = true;
                }
            }
            else
            {
                e.Handled = true;
            }
        }

Answer 4

 string s=string.Empty;
            if (textBox1.Text != ":")
            {
                Regex r = new Regex(@"^\d*$|\:");
                if (!r.IsMatch(this.textBox1.Text))
                {
                    textBox1.Text = s;//恢复  
                    textBox1.SelectionStart = s.Length;
                }
                else
                    s = textBox1.Text;
            }
            else
            {
               textBox1.Text=s;
            }

Answer 5

        private void textBox4_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar==':')
            {
                e.Handled = true;
            }
        }数字字母同样实现的方式很多

Answer 6

哪不对了，写在KeyPress事件中

Answer 7

先事件，keypress事件，在里面用正则判断。。