Winform TextBox中只能输入数字的几种常用方法(C#)
2021-03-29 08:30
标签:const .text his ror ESS end 方法 pat null
Winform TextBox中只能输入数字的几种常用方法(C#) 标签:const .text his ror ESS end 方法 pat null 原文地址:https://www.cnblogs.com/net-sky/p/9301853.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‘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 != 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
文章标题:Winform TextBox中只能输入数字的几种常用方法(C#)
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