.Net常用技巧_字符串检查与判断

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace MyUtility
{
    /// <summary>
    ///
    /// </summary>
    public class IsNumber
    {
        /// <summary>
        /// 判断字符串是否为整数字符串
        /// </summary>
        /// <param name="message"></param>
        /// <returns></returns>
        public bool isNumber(String message)
        {
            Regex rex = new Regex(@"^\d+$");
            if (rex.IsMatch(message))
                return true;
            else
                return false;
        }

        /// <summary>
        /// 判断字符串是否为指定长度的整数字符串
        /// </summary>
        /// <param name="message"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        public bool isNumber(String message, int length)
        {
            String arg = @"^\d{"+length+"}$";
            Regex rex = new Regex(arg);
            if(message != "" && length > 0 && rex.IsMatch(message))
                return true;
            else
                return false;
        }

        /// <summary>
        /// 判断字符串是否为指定长度的小数字符串
        /// </summary>
        /// <param name="value"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        public static bool isDecimal(String value, int precision, int scale) {
            if (precision == 0) return false;
            string pattern = @"(^\d{1,"+precision+"}";
            if(scale>0)
                pattern += @"\.\d{0," + scale + "}$)|" + pattern ;
            pattern += "$)";

            return Regex.IsMatch(value,pattern);
        }

    }
}

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