Winform TextBox中只能输入数字的几种常用方法(C#)

原文出自 浆糊033，链接：https://www.cnblogs.com/maxin991025-/p/6219681.html

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 }

 

转载于:https://www.cnblogs.com/chenboyhd/p/11312428.html

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