/// 判斷字符串是否是數(shù)字?

public static bool IsNumType(this string str, NumType nt) {?

string matchString = "";?

switch (nt)? {?

case NumType.NonNegativeInt:?

//非負(fù)整數(shù)（正整數(shù) + 0）?

matchString = @"^[1-9]+[0-9]*$|^0$";?

?break;?

?case NumType.PositiveInt:?

//正整數(shù)?

matchString = @"^[1-9]+[0-9]*$";?

break;?

case NumType.NonPositiveInt:?

//非正整數(shù)（負(fù)整數(shù) + 0）?

matchString = @"^-[1-9]+[0-9]*$|^0$";?

break;?

case NumType.NegativeInt:?

//負(fù)整數(shù)?

matchString = @"^^-[1-9]+[0-9]*$";?

break;?

case NumType.Int:?

//整數(shù)?

matchString = @"^-?[1-9]+[0-9]*$|^0$";?

break;?

case NumType.NonNegative:?

//非負(fù)數(shù)（正數(shù) + 0）?

matchString = @"(^(0\.0*[1-9]+[0-9]*$|[1-9]+[0-9]*\.[0-9]*[0-9]$|[1-9]+[0-9]*$)|^0$)";?

break;?

case NumType.Positive:?

//正數(shù)?

matchString = @"^(0\.0*[1-9]+[0-9]*$|[1-9]+[0-9]*\.[0-9]*[0-9]$|[1-9]+[0-9]*$)";?

break;?

case NumType.NonPositive:?

//非正數(shù)（負(fù)數(shù) + 0）?

matchString = @"(^-(0\.0*[1-9]+[0-9]*$|[1-9]+[0-9]*\.[0-9]*[0-9]$|[1-9]+[0-9]*$)|^0$)";?

break;?

case NumType.Negative:?

//負(fù)數(shù)?

matchString = @"^-(0\.0*[1-9]+[0-9]*$|[1-9]+[0-9]*\.[0-9]*[0-9]$|[1-9]+[0-9]*$)";?

break;?

default:?

break;?

}?

return Regex.IsMatch(str, matchString, RegexOptions.IgnoreCase);?

?}