TextBox中只能输入数字的几种常用方法(C#)

Bertha 。 2022-06-14 04:23 122阅读 0赞

**本文原网址为:http://bbs.bccn.net/thread-205138-1-1.html**

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  
                \}  
            \}  
        \}  
  
   
  
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;  
    \}  
  
\}  
   
  
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;  
\}  
\}  
\}   
  
   
  
   
  
private void button1\_Click(object sender, EventArgs e)   
\{   
string text = this.textBox1.Text;   
if (text != null)   
MessageBox.Show(text);   
\}   
  
private void textBox1\_Validating(object sender, CancelEventArgs e)   
\{   
const string pattern = @"^\\d+\\.?\\d+$";   
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);   
\}  
  
   
  
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;  
\}  
  
\}  
  
   
  
  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;  
                \}  
            \}        
        \}