Asp.net 字串操作基類(安全,替換,分解等)

/**********************************************************************************
*
* 功能說明:常用函數基類
* 作者: 劉功勳;
* 版本:V0.1(C#2.0);時間:2006-8-13
*
* *******************************************************************************/
/***************************************************************
* 更新記錄
* 2007-1-5 更新:
* 1,取字串右側的幾個字元
* 2,替換右側的字串
****************************************************************/
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
namespace EC
{
/// <summary>
/// 常用函數基類
/// </summary>
public class FunObject
{
#region 替換字串
/// <summary>
/// 功能:替換字元
/// </summary>
/// <param name="strVAlue">字串</param>
/// <returns>替換掉'的字串</returns>
public static string FilterSQL(string strVAlue)
{
string str = "";
str = strVAlue.Replace("''", "");
return str;
}
#endregion
#region 對錶 表單內容進行轉換HTML操作,
/// <summary>
/// 功能:對錶 表單內容進行轉換HTML操作,
/// </summary>
/// <param name="fString">html字串</param>
/// <returns></returns>
public static string HtmlCode(string fString)
{
string str = "";
str = fString.Replace(">", ">");
str = fString.Replace("<", "<");
str = fString.Replace(" ", " ");
str = fString.Replace("\n", "<br />");
str = fString.Replace("\r", "<br />");
str = fString.Replace("\r\n", "<br />");
return str;
}
#endregion
#region 判斷是否:傳回值：√ or ×
/// <summary>
/// 判斷是否:傳回值：√ or ×
/// </summary>
/// <param name="b">true 或false</param>
/// <returns>√ or ×</returns>
public static string Judgement(bool b)
{
string s = "";
if (b == true)
s = "<b><font color=#009900>√</font></b>";
else
s = "<b><font color=#FF0000>×</font></b>";
return s;
}
#endregion
#region 截取字串
/// <summary>
/// 功能:截取字串長度
/// </summary>
/// <param name="str">要截取的字串</param>
/// <param name="length">字串長度</param>
/// <param name="flg">true:加...,flase:不加</param>
/// <returns></returns>
public static string GetString(string str, int length, bool flg)
{
int i = 0, j = 0;
foreach (char chr in str)
{
if ((int)chr > 127)
{
i += 2;
}
else
{
i++;
}
if (i > length)
{
str = str.Substring(0, j);
if (flg)
str += "......";
break;
}
j++;
}
return str;
}
#endregion
#region 截取字串+…
/// <summary>
/// 截取字串+…
/// </summary>
/// <param name="strInput"></param>
/// <param name="intlen"></param>
/// <returns></returns>
public static string CutString(string strInput, int intlen)//截取字串
{
ASCIIEncoding ascii = new ASCIIEncoding();
int intLength = 0;
string strString = "";
byte[] s = ascii.GetBytes(strInput);
for (int i = 0; i < s.Length; i++)
{
if ((int)s[i] == 63)
{
intLength += 2;
}
else
{
intLength += 1;
}
try
{
strString += strInput.Substring(i, 1);
}
catch
{
break;
}
if (intLength > intlen)
{
break;
}
}
//如果截過則加上半個省略符號
byte[] mybyte = System.Text.Encoding.Default.GetBytes(strInput);
if (mybyte.Length > intlen)
{
strString += "…";
}
return strString;
}
#endregion
#region 字串分函數
/// <summary>
/// 字串分函數
/// </summary>
/// <param name="strID"></param>
/// <param name="index"></param>
/// <param name="Separ"></param>
/// <returns></returns>
public string StringSplit(string strings, int index, string Separ)
{
string[] s = strings.Split(char.Parse(Separ));
return s[index];
}
#endregion
#region 分解字串為數組
/// <summary>
/// 字串分函數
/// </summary>
/// <param name="str">要分解的字串</param>
/// <param name="splitstr">分割符,可以為string類型</param>
/// <returns>字元數組</returns>
public static string[] splitstr(string str, string splitstr)
{
if (splitstr != "")
{
System.Collections.ArrayList c = new System.Collections.ArrayList();
while (true)
{
int thissplitindex = str.IndexOf(splitstr);
if (thissplitindex >= 0)
{
c.Add(str.Substring(0, thissplitindex));
str = str.Substring(thissplitindex + splitstr.Length);
}
else
{
c.Add(str);
break;
}
}
string[] d = new string[c.Count];
for (int i = 0; i < c.Count; i++)
{
d[i] = c[i].ToString();
}
return d;
}
else
{
return new string[] { str };
}
}
#endregion
#region URL編碼
/// <summary>
/// URL編碼
/// </summary>
/// <param name="str">字串</param>
/// <returns></returns>
public static string UrlEncoding(string str)
{
byte[] bytes = System.Text.Encoding.UTF8.GetBytes(str);
return System.Text.Encoding.UTF8.GetString(bytes).ToString();
}
#endregion
#region 擷取Web.config中的配置欄位值
/// <summary>
/// 擷取全域配置參數
/// </summary>
/// <param name="key">鍵名</param>
/// <returns>參數</returns>
public static string GetApp(string key)
{
System.Configuration.AppSettingsReader appr = new System.Configuration.AppSettingsReader();
try
{
string str = (string)appr.GetValue(key, typeof(string));
if (str == null || str == "") return null;
return str;
}
catch (Exception E) { }
return null;
}
#endregion
#region 根據傳入的字串是否為yes/no返回Bit
/// <summary>
/// 根據傳入的字串是否為yes/no返回Bit
/// </summary>
/// <param name="flg"></param>
/// <returns></returns>
public static int GetBitBool(string flg)
{
int str = 0;
switch (flg.ToLower())
{
case "yes":
str = 1;
break;
case"no":
str = 0;
break;
default:
break;
}
return str;
}
#endregion
#region Html編碼
/// <summary>
/// HTML編碼
/// </summary>
/// <param name="strInput"></param>
/// <returns></returns>
public static string HtmlEncode(string strInput)
{
string str;
try
{
str = HttpContext.Current.Server.HtmlEncode(strInput);
}
catch
{
str = "error";
}
return str;
}
/// <summary>
/// HTML解碼
/// </summary>
/// <param name="strInput"></param>
/// <returns></returns>
public static string HtmlDecode(string strInput)
{
string str;
try
{
str = HttpContext.Current.Server.HtmlDecode(strInput);
}
catch
{
str = "error";
}
return str;
}
#endregion
#region 檢測一個字元符,是否在另一個字元中,存在,存在返回true,否則返回false
/// <summary>
/// 檢測一個字元符,是否在另一個字元中,存在,存在返回true,否則返回false
/// </summary>
/// <param name="srcString">原始字串</param>
/// <param name="aimString">目標字串</param>
/// <returns></returns>
public static bool IsEnglish(string srcString, string aimString)
{
bool Rev = true;
string chr;
if (aimString == "" || aimString == null) return false;
for (int i = 0; i < aimString.Length; i++)
{
chr = aimString.Substring(i, 1);
if (srcString.IndexOf(chr) < 0)
{
return false;
break;
}
}
return Rev;
}
#endregion
#region 檢測字串中是否含有中文及中文長度
/// <summary>
/// 檢測字串中是否含有中文及中文長度
/// </summary>
/// <param name="str">要檢測的字串</param>
/// <returns>中文字串長度</returns>
public static int CnStringLength(string str)
{
ASCIIEncoding n = new ASCIIEncoding();
byte[] b = n.GetBytes(str);
int l = 0; // l 為字串之實際長度
for (int i = 0; i <= b.Length - 1; i++)
{
if (b[i] == 63) //判斷是否為漢字或全腳符號
{
l++;
}
}
return l;
}
#endregion
#region 取字串右側的幾個字元
/// <summary>
/// 取字串右側的幾個字元
/// </summary>
/// <param name="str">字串</param>
/// <param name="length">右側的幾個字元</param>
/// <returns></returns>
public static string GetStrRight(string str, int length)
{
string Rev = "";
if (str.Length < length)
{
Rev = str;
}
else
{
Rev = str.Substring(str.Length - length, length);
}
return Rev;
}
#endregion
#region 替換右側的字串
/// <summary>
/// 替換右側的字串
/// </summary>
/// <param name="str">字串</param>
/// <param name="strsrc">右側的字串</param>
/// <param name="straim">要替換為的字串</param>
/// <returns></returns>
public static string RepStrRight(string str, string strsrc, string straim)
{
string Rev = "";
if (GetStrRight(str, strsrc.Length) != strsrc)
{
Rev = str;
}
else
{
Rev = str.Substring(0, str.Length - strsrc.Length).ToString() + straim.ToString();
}
return Rev;
}
#endregion
}
}