Question

Winform TextBox中只能输入数字的几种常用方法(C#)

Answer 1

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;}elseerrorProvider1.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))
================48代表0，57代表9，8代表空格，46代表小数点}