using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Text.RegularExpressions; namespace shop { public class IsNum { /// <summary> /// 判断是否是数字 /// </summary> /// <param name="strNumber">要判断的字符串</param> /// <returns></returns> public bool IsNumber(String strNumber) { Regex objNotNumberPattern = new Regex("[^0-9.-]"); Regex objTwoDotPattern = new Regex("[0-9]*[.][0-9]*[.][0-9]*"); Regex objTwoMinusPattern = new Regex("[0-9]*[-][0-9]*[-][0-9]*"); String strValidRealPattern = "^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$"; String strValidIntegerPattern = "^([-]|[0-9])[0-9]*$"; Regex objNumberPattern = new Regex("(" + strValidRealPattern + ")|(" + strValidIntegerPattern + ")"); return !objNotNumberPattern.IsMatch(strNumber) && !objTwoDotPattern.IsMatch(strNumber) && !objTwoMinusPattern.IsMatch(strNumber) && objNumberPattern.IsMatch(strNumber); } } }
![](https://img2024.cnblogs.com/blog/35695/202408/35695-20240813180353098-2140851696.jpg)