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+$"; 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 }
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