验证输入内容为数值型

Question

有个textbox 想用验证控件验证输入内容为数值型

Answer 1

private bool IsNumeric(string str) 
{ 
if (str==null || str.Length==0) 
return false; 
foreach(char c in str) 
{ 
if (!Char.IsNumber(c)) 
{ 
return false; 
} 
} 
return true; 
}

Answer 2

   <asp:RegularExpressionValidator id="RegularExpressionValidator1" 
                     ControlToValidate="TextBox1"
                     ValidationExpression="\d"
                     Display="Static"
                     EnableClientScript="false"
                     ErrorMessage="必须为数字"
                     runat="server"/>

Answer 3

<asp:RegularExpressionValidator id="RegularExpressionValidator1" 
                    ControlToValidate="TextBox1" 
                    ValidationExpression="\d" 
                    Display="Static" 
                    EnableClientScript="false" 
                    ErrorMessage="必须为数字" 
                    runat="server"/> 

Answer 4

        呵呵。。大家的都不错。。我来一个高效的。
             public bool IsNumber(string txt)
{
bool returnVal = false;
try
{
int.Parse(txt);//不是整数是报异常
returnVal = true;
}
catch
{}
return returnVal;
}

Answer 5

<asp:RegularExpressionValidator id="RegularExpressionValidator1" 
                    ControlToValidate="TextBox1" 
                    ValidationExpression="\d" 
                    Display="Static" 
                    EnableClientScript="false" 
                    ErrorMessage="必须为数字" 
                    runat="server"/> 

Answer 6

public bool IsNumber(string txt)
{
bool returnVal = false;
try
{
int.Parse(txt);//不是整数是报异常
returnVal = true;
}
catch
{}
return returnVal;
}

Answer 7

只能输数字的,我有个好用的代码:
onpaste="this.value=this.value.replace(/[^0-9]/g,'')"