类库——对一些字符串进行操作的类1.判断输入是否数字2.截取字符串函数3.过滤输入信息4.生成随机数5.生成验证码图片6.获取汉字第一个拼音7.半角转全角8.全角转半角
2013年11月20日
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using System;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;
using System.IO;
using System.Drawing.Imaging;
using System.Text;
using System.Web.Security;
namespace WeYyzyq.Comp
...{
/**//// <summary>
/// 对一些字符串进行操作的类
/// 创建时间：2006-8-3
/// 创建者：马先光
/// </summary>
public class StringUtil
...{
private static string passWord; //加密字符串
/**//// <summary>
/// 判断输入是否数字
/// </summary>
/// <param name="num">要判断的字符串</param>
/// <returns></returns>
static public bool VldInt(string num)
...{
...#region
try
...{
Convert.ToInt32(num);
return true;
}
catch ...{ return false; }
#endregion
}
/**//// <summary>
/// 返回文本编辑器替换后的字符串
/// </summary>
/// <param name="str">要替换的字符串</param>
/// <returns></returns>
static public string GetHtmlEditReplace(string str)
...{
...#region
return str.Replace("'", "''").Replace(" ", " ").Replace(",", "，").Replace("%", "％").Replace("script","").Replace(".js","");
#endregion
}
/**//// <summary>
/// 截取字符串函数
/// </summary>
/// <param name="str">所要截取的字符串</param>
/// <param name="num">截取字符串的长度</param>
/// <returns></returns>
static public string GetSubString(string str, int num)
...{
...#region
return (str.Length > num) ? str.Substring(0, num) + "..." : str;
#endregion
}
/**//// <summary>
/// 过滤输入信息
/// </summary>
/// <param name="text">内容</param>
/// <param name="maxLength">最大长度</param>
/// <returns></returns>
public static string InputText(string text, int maxLength)
...{
...#region
text = text.Trim();
if (string.IsNullOrEmpty(text))
return string.Empty;
if (text.Length > maxLength)
text = text.Substring(0, maxLength);
text = Regex.Replace(text, "[/s]{2,}", " "); //two or more spaces
text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|/n)*?>)", " "); //<br><p>
text = Regex.Replace(text, "(/s*&[n|N][b|B][s|S][p|P];/s*)+", " "); //
text = Regex.Replace(text, "<(.|/n)*?>", string.Empty); //any other tags
text = text.Replace("'", "''");
return text;
#endregion
}
/**//// <summary>
/// 生成随机数
/// </summary>
/// <returns></returns>
private string GenerateCheckCode()
...{
...#region
int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random();
for (int i = 0; i < 5; i++)
...{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
HttpContext.Current.Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
return checkCode;
#endregion
}
/**//// <summary>
/// 生成验证码图片
/// </summary>
public void CreateCheckCodeImage()
...{
...#region
string checkCode = GenerateCheckCode();
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Graphics g = Graphics.FromImage(image);
try
