Winform TextBox中只能输入数字的几种常用方法(C#)

privatevoid 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
}
}
}

privatevoid 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;
}

}


privatevoid 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;
}
}
} 





privatevoid button1_Click(object sender, EventArgs e) 
{ 
string text =this.textBox1.Text; 
if (text !=null) 
MessageBox.Show(text); 
} 

privatevoid textBox1_Validating(object sender, CancelEventArgs e) 
{ 
conststring 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); 
}



privatevoid 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;
}

}



privatevoid 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
}
elseif (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;
}
} 
}







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
}