[C#][转载]Winform TextBox中只能输入数字的几种常用方法(C#)

方法一：  private void tBox_KeyPress(object sender, KeyPressEventArgs e)   {              if (e.KeyChar == 0x20) e.KeyChar = (char)0;  //禁止空格键              if ((e.KeyChar == 0x2D) && (((TextBox)sender).Text.Length == 0)) return;   //处理负数              if (e.KeyChar > 0x20)              {                  try                  {                      double.Parse(((TextBox)sender).Text + e.KeyChar.ToString());                  }                  catch                  {                      e.KeyChar = (char)0;   //处理非法字符                  }              }  }  方法二：  private void TextBox_KeyPress(object sender, KeyPressEventArgs e)   {      if(e.KeyChar!=8&&!Char.IsDigit(e.KeyChar))      {        e.Handled = true;      }  }  或者  private void TextBox_KeyPress(object sender, KeyPressEventArgs e)  {      if(e.KeyChar!='\b'&&!Char.IsDigit(e.KeyChar))      {        e.Handled = true;      }  }  方法三:  private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)  {  if(e.KeyChar!='\b')//这是允许输入退格键  {  if((e.KeyChar<'0')||(e.KeyChar>'9'))//这是允许输入0-9数字  {  e.Handled = true;  }  }  }  方法四:  private void textBox1_Validating(object sender, CancelEventArgs e)   {   const string pattern = @"^\d+\.?\d+{1}quot;;   string content = ((TextBox)sender).Text;   if (!(Regex.IsMatch(content, pattern)))   {   errorProvider1.SetError((Control)sender, "只能输入数字!");   e.Cancel = true;   }   else   errorProvider1.SetError((Control)sender, null);   }  方法五:  private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)  {  if(e.KeyChar=='.' && this.textBox1.Text.IndexOf(".")!=-1)  {  e.Handled=true;  }  if(!((e.KeyChar>=48 && e.KeyChar<=57) || e.KeyChar=='.' || e.KeyChar==8))  {  e.Handled=true;  }  }  方法六：  private void tbx_LsRegCapital_KeyPress(object sender, KeyPressEventArgs e)  {              if (!Char.IsNumber(e.KeyChar) && !Char.IsPunctuation(e.KeyChar) && !Char.IsControl(e.KeyChar))              {                  e.Handled = true;//消除不合适字符              }              else if (Char.IsPunctuation(e.KeyChar))              {                  if (e.KeyChar != '.' || this.textBox1.Text.Length == 0)//小数点                  {                      e.Handled = true;                  }                  if (textBox1.Text.LastIndexOf('.') != -1)                  {                      e.Handled = true;                  }              }          }    方法七:  利用ASCII码处理办法、  {              if ((e.KeyChar <= 48 || e.KeyChar >=57) && (e.KeyChar != 8) && (e.KeyChar != 46))                e.Handled = true;  ================48代表0，57代表9，8代表空格，46代表小数点