C#判断整数、小数位数的判定

C#判断整数、小数位数的判定

public static bool IsInteger(string s)
{
    string pattern = @"^\d*$";
    return Regex.IsMatch(s,pattern);
}
/// <summary>
/// 判断一个字符串是否为合法数字(0-32整数)
/// </summary>
/// <param name="s">字符串</param>
/// <returns></returns>
public static bool IsNumber(string s)
{
    return IsNumber(s,32,0);
}
/// <summary>
/// 判断一个字符串是否为合法数字(指定整数位数和小数位数)
/// </summary>
/// <param name="s">字符串</param>
/// <param name="precision">整数位数</param>
/// <param name="scale">小数位数</param>
/// <returns></returns>
public static bool IsNumber(string s,int precision,int scale)
{
    if((precision == 0)&&(scale == 0))
    {
        return false;
    }
    string pattern = @"(^\d{1,"+precision+"}";
    if(scale>0)
    {
        pattern += @"\.\d{0,"+scale+"}$)|"+pattern;
    }
    pattern += "$)";
    return Regex.IsMatch(s,pattern);
}