C#将隐私信息(银行账户，身份证号码)中间部分特殊字符替换成*

/// <summary>
/// 将传入的字符串中间部分字符替换成特殊字符
/// </summary>
/// <param name="value">需要替换的字符串</param>
/// <param name="startLen">前保留长度</param>
/// <param name="endLen">尾保留长度</param>
/// <param name="replaceChar">特殊字符</param>
/// <returns>被特殊字符替换的字符串</returns>
private static string ReplaceWithSpecialChar(string value, int startLen = 4, int endLen = 4, char specialChar = '*')
{
 try
 {
  int lenth = value.Length - startLen - endLen;
  string replaceStr = value.Substring(startLen, lenth);
  string specialStr = string.Empty;
  for (int i = 0; i < replaceStr.Length; i++)
  {
   specialStr += specialChar;
  }
  value = value.Replace(replaceStr, specialStr);
 }
 catch (Exception)
 {
  throw;
 }
 return value;
}

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Data.SqlClient;
using System.Configuration;
//导入自定义的类库
using _3Layer.DataLayer.DataCommon;
using _3Layer.DataLayer.DataCommon.DataAccess;
using Library.ClassLibrary.Crypt.DES;
namespace CHONGCHONG.XML
public class RenderingXML : System.Web.UI.Page
{
/// <summary>
/// 从数据库预生成XML数据源
/// </summary>
private void PreRenderXML()
{
string strSQL = "select语句略去........................;
myDataLayer.Open();
RenderingXml="<?xml version='1.0' 
encoding='gb2312'?>\r\n";
RenderingXml+="<xml>\r\n";
try
{ 
System.Data.SqlClient.SqlDataReader myDR 
= (SqlDataReader)myDataLayer.ExecuteReader( strSQL );
while(myDR.Read())
{
RenderingXml+="<TreeNode id='"+myDR["BoardID"]+"'>\r\n";
RenderingXml+="<NodeText>"+myDR["BoardName"]+"</NodeText>\r\n";
RenderingXml+="<title>"+myDR["Title"]+"</title>\r\n";
RenderingXml+="<NodeUrl>"+EncodeHTML
( EncodeParameter( myDR["Link"].ToString() ) )+"</NodeUrl>\r\n";
RenderingXml+="<child>"+myDR["children"]+"</child>\r\n";
RenderingXml+="<target>"+myDR["Target"]+"</target>\r\n";
RenderingXml+="</TreeNode>\r\n";
}
}
catch(System.Data.SqlClient.SqlException ee)
{
return ;
}
finally
{
myDataLayer.Close() ; 
}
RenderingXml+="</xml>";
byte[] bytResult = Encoding.Default.GetBytes( RenderingXml ) ;
Response.ContentType = "text/xml" ;
Response.BinaryWrite( bytResult ) ;
} 
/// <summary>
/// Description:加密路径参数
/// </summary>
/// <param name="sourParameter"></param>
/// <returns></returns>
private string EncodeParameter( string sourParameter )
{
string startString = String.Empty ;
string endString = String.Empty ; 
StringBuilder destParameter = new StringBuilder() ;
if( sourParameter == null || sourParameter.Equals("") )
{
destParameter.Append( String.Empty ).ToString() ;
}
else
{
//开始分析路径里的?字符
if( sourParameter.IndexOf("?")<0 )
{
destParameter.Append( sourParameter ).ToString() ;
}
else
{
//以?号分割路径
string[] paramPath = sourParameter.Split( new char[]{'?'} ) ;
startString = paramPath[0].ToString() ;
endString = paramPath[1].ToString() ;
//开始分析路径里的&字符
if(sourParameter.IndexOf("&")<0)
{
//只有一个参数,用=号分割,直接把NameValue进行Des加密
string[] paramNameValue = endString.Split( new char[]{'='} ) ;
string paramName = myDES.Encrypt
( paramNameValue[0].ToString() ,myDESKey ) ;
string paramValue = myDES.Encrypt
( paramNameValue[1].ToString() ,myDESKey ) ;
destParameter.Append( startString ).Append("?").
Append( paramName ).Append("=").Append( paramValue ) ;
}
else
{
//有多个参数,以&号分割?号后面的路径
string[] paramJoin = endString.Split( new char[]{'&'} ) ;
destParameter.Append( startString ).Append("?").
Append( EncoderNameValue( paramJoin ) ) .ToString() ;
}
}
}
return destParameter.ToString() ;
} 
/// <summary>
/// Description:加密路径里的NameValue参数
/// </summary>
/// <param name="sourNameValue"></param>
/// <returns></returns>
private string EncoderNameValue( string[] sourNameValue )
{
string[] paramNameValue ;
string paramName ;
string paramValue ;
StringBuilder sb = new StringBuilder() ;
for( int i = 0 ; i <= sourNameValue.Length-1 ; i++ )
{
//以＝号分割每个NameValue参数
paramNameValue = sourNameValue[i].Split( new char[]{'='} ) ;
//开始对NameValue加密
paramName = myDES.Encrypt( paramNameValue[0].ToString() ,myDESKey ) ;
paramValue = myDES.Encrypt( paramNameValue[1].ToString() ,myDESKey ) ;
//存储加密后的路径字符串
sb.Append( paramName ).Append("=").Append( paramValue ) ;
//是否最后一个NameValue参数，若不是在路基里添加&参数连接符
if( i<sourNameValue.Length )
{
sb.Append("&") ;
}
}
return sb.ToString() ;
}
}