将用户输入的字符串转换为可换行、替换Html编码、无危害数据库特殊字符、去掉首尾空白、的安全方便代码

//正则表达式 命名空间引用
using System.Text.RegularExpressions;
/// <summary>
  /// 将用户输入的字符串转换为可换行、替换Html编码、无危害数据库特殊字符、去掉首尾空白、的安全方便代码。
  /// </summary>
  /// <param name="inputString">用户输入字符串</param>
  public static string ConvertStr(string inputString)
  {
   string retVal=inputString;
   retVal=retVal.Replace("&","&amp;");
   retVal=retVal.Replace("\"","&quot;");
   retVal=retVal.Replace("<","&lt;");
   retVal=retVal.Replace(">","&gt;");
   retVal=retVal.Replace(" ","&nbsp;");
   retVal=retVal.Replace("  ","&nbsp;&nbsp;");
   retVal=retVal.Replace("\t","&nbsp;&nbsp;");
   retVal=retVal.Replace("\r", "<br>");
   return retVal;
  }

  public static string ToUrl(string inputString)
  {
   string retVal=inputString;
   retVal= ConvertStr(retVal);
   retVal= Regex.Replace(retVal,@"\[url](?<x>[^\]]*)\[/url]",@"<a href=""$1"" target=""_blank"">$1</a>",RegexOptions.IgnoreCase);
   retVal= Regex.Replace(retVal,@"\[flash=(?<width>\d+),(?<height>\d+)](?<x>[^\]]*)\[/flash]",@"<embed src=""$3"" width=""${width}"" height=""${height}""></embed>",RegexOptions.IgnoreCase);
   retVal= Regex.Replace(retVal,@"\[flash](?<x>[^\]]*)\[/flash]",@"<embed src=""$1""></embed>",RegexOptions.IgnoreCase);
   return Regex.Replace(retVal,@"\[img](?<x>[^\]]*)\[/img]",@"<a href=""$1"" target=""_blank""><img src=""$1"" onload=""javascript:if(this.width>screen.width-220)this.width=screen.width-220"" border=1></a>",RegexOptions.IgnoreCase);
  }

 

this.lbDescription.Text = "&nbsp;&nbsp;&nbsp;"+ToUrl(currentDR["Description"].ToString());//调用方法