Winform TextBox中只能输入数字的几种常用方法(C#)

来源：互联网发布：python软件哪里下载编辑：程序博客网时间：2024/06/01 07:44
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}
0 0