C#判断一个字符串是否为整数
时间：2010-09-22 来源：violet_sky
- /// <summary>
- /// 判断一个字符串是否为合法整数(不限制长度)
- /// </summary>
- /// <param name="s">字符串</param>
- /// <returns></returns>
- 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);
- }
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