随机数生成-检测非法字符-判断数字格式-是否为空代码,Asp.Net代码库,德仔网

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【Asp.Net】随机数生成-检测非法字符-判断数字格式-是否为空
作者:Dezai.CN / 发布于2012/3/20/ 578
随机数生成、检测非法字符、判断数字格式、是否为空、
<div></div>
using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Text;

namespace InsApp.word
{
/**//// <summary>
/// string CreateRandomCode(int codeCount) 根据长度生成随机的数字和字母
/// bool toFilter(string thePara) 检测非法字符，如果参数是空/包含非法字符，返回false/否则返回 true
/// bool CheckNumber(string GetNum) 判断是否是数字格式
/// bool CheckNumberRegx(string GetNum) 判断是否是正负数字含小数
/// bool CheckNullstr(string Getstr) 判断是否是空值null 返回true || false
/// </summary>
public class CreateCode
{
生成随机的数字和字母 codeCount是希望生成的长度#region生成随机的数字和字母 codeCount是希望生成的长度
/**//// <summary>
///生成随机的数字和字母
/// </summary>
/// <param name="codeCount">codeCount是希望生成的长度</param>
/// <returns></returns>
public string CreateRandomCode(int codeCount) //codeCount是希望生成的长度
{
string allChar = "0,1,2,3,4,5,6,7,8,9";
string[] allCharArray = allChar.Split(',');
string randomCode = "";
Random rand = new Random();
int temp = -1;
for (int i = 0; i < codeCount; i++)
{
if (temp != -1)
{
rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
}
int t = rand.Next(0,10);
temp = t;
randomCode += allCharArray[t];
}
return randomCode;
}
#endregion
判断是否是数字格式#region判断是否是数字格式
/**//// <summary>
/// 判断是否是数字格式
/// </summary>
/// <param name="GetNum"></param>
public bool CheckNumber(string GetNum)
{
Regex r = new Regex(@"^[0-9]+$");
if (r.IsMatch(GetNum))
{
return true;
}
else
{
return false;
}
}
#endregion
检测非法字符，防止sql注入#region检测非法字符，防止sql注入
/**//// <summary>
/// 检测非法字符，防止sql注入
/// 如果参数是空，返回false
/// 如果参数中包含非法字符，返回false
///// 否则返回 true
/// </summary>
/// <param name="thePara"></param>
/// <returns></returns>
public bool toFilter(string thePara)
{
string[] BadCode = new string[] { "'", "\"", "exec", "cmd", ">", "<", "and", "=", "\\", ";" };
try
{
if (CheckNullstr(thePara) == false) //如果参数是空值，返回false
{
throw new Exception("参数为空");
}
else
{
for (int i = 0; i < BadCode.Length; i++)
{
if (thePara.IndexOf(BadCode[i]) > 0)
{
throw new Exception("包含非法字符");
}
}
}
return true;
}
catch
return false;
}

}
#endregion
bool CheckNullstr(string Getstr)判断是否是空值#region bool CheckNullstr(string Getstr)判断是否是空值
/**//// <summary>
/// Getstr得到参数判断是否是空值
/// </summary>
/// <param name="Getstr">需要检查的值</param>
/// <param name="GetShow">这个字段的功能说明：姓名,sex</param>
public bool CheckNullstr(string Getstr)
{
try
{
if (Getstr == null || Getstr == "" || Getstr.Length < 1)
{
return false;
}
else
{
return true;
}
}
catch 
{
return false;
}
}
#endregion
bool CheckNumberRegx(string GetNum)正则表达式 判断是否是正负数字含小数#region bool CheckNumberRegx(string GetNum)正则表达式 判断是否是正负数字含小数
/**//// <summary>
/// 判断是否是数字格式
/// </summary>
/// <param name="GetNum"></param>
public bool CheckNumberRegx(string GetNum)
{
//^[+-]?\d+(\.\d+)?$正负数字含小数 数字含小数^\d+(\.\d+)?$
Regex r = new Regex(@"^\d+(\.\d+)?$");
if (r.IsMatch(GetNum))
{
return true;
}
else
{
return false;
}
}
#endregion
用C#截取指定长度的中英文混合字符串#region用C#截取指定长度的中英文混合字符串
/**//// <summary>
/// s接受的字符
/// l长度
/// </summary>
/// <param name="s"></param>
/// <param name="l"></param>
/// <returns></returns>
public static string CutStr(string s, int l)
{
string temp = s;
if (Regex.Replace(temp, "[\u4e00-\u9fa5]", "zz", RegexOptions.IgnoreCase).Length <= l)
{
return temp;
}
for (int i = temp.Length; i >= 0; i--)
{
temp = temp.Substring(0, i);
if (Regex.Replace(temp, "[\u4e00-\u9fa5]", "zz", RegexOptions.IgnoreCase).Length <= l - 3)
{
return temp + "";
}
}
return "";
}
#endregion
数字和字母随机数#region 数字和字母随机数
/**//// <summary>
/// 数字和字母随机数
/// </summary>
/// <param name="n">生成长度</param>
/// <returns></returns>
public static string Rand_Number_AZ_Code(int n)
{
char[] arrChar = new char[]{
'a','b','d','c','e','f','g','h','i','j','k','l','m','n','p','r','q','s','t','u','v','w','z','y','x',
'0','1','2','3','4','5','6','7','8','9',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','Q','P','R','T','S','V','U','W','X','Y','Z'
};
StringBuilder num = new StringBuilder();
Random rnd = new Random(DateTime.Now.Millisecond);
for (int i = 0; i < n; i++)
{
num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString());
}
return num.ToString();
}
#endregion
字母随机数#region 字母随机数
/**//// <summary>
/// 字母随机数
/// </summary>
/// <param name="n">生成长度</param>
/// <returns></returns>
public static string RandLetter(int n)
{
char[] arrChar = new char[]{
'a','b','d','c','e','f','g','h','i','j','k','l','m','n','p','r','q','s','t','u','v','w','z','y','x',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','Q','P','R','T','S','V','U','W','X','Y','Z'
};
StringBuilder num = new StringBuilder();
Random rnd = new Random(DateTime.Now.Millisecond);
for (int i = 0; i < n; i++)
{
num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString());
}
return num.ToString();
}
#endregion
日期随机函数#region 日期随机函数
/**//// <summary>
/// 日期随机函数
/// </summary>
/// <param name="ra">长度</param>
/// <returns></returns>
public static string DateRndName(Random ra)
{
DateTime d = DateTime.Now;
string s = null, y, m, dd, h, mm, ss;
y = d.Year.ToString();
m = d.Month.ToString();
if (m.Length < 2) m = "0" + m;
dd = d.Day.ToString();
if (dd.Length < 2) dd = "0" + dd;
h = d.Hour.ToString();
if (h.Length < 2) h = "0" + h;
mm = d.Minute.ToString();
if (mm.Length < 2) mm = "0" + mm;
ss = d.Second.ToString();
if (ss.Length < 2) ss = "0" + ss;
s += y + m + dd + h + mm + ss;
s += ra.Next(100, 999).ToString();
return s;
}
#endregion
生成GUID#region 生成GUID
/**//// <summary>
/// 生成GUID
/// </summary>
/// <returns></returns>
public static string GetGuid()
{
System.Guid g = System.Guid.NewGuid();
return g.ToString();
}
#endregion
}
}
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