c#去html标志,对字符串保留数字小数点，有中文的日期转化等特殊数据处理

命名空间

using System.Text.RegularExpressions;

1.我们采集到的数据 比如有些日期很不规则 带有中文 比如2013年5月8日     2013年5月  这里提供把这类不规则的日期转化成datatime类型

public DateTime  ConvertTime(string a)
        {
           

             DateTime dt;
             try
             {
                 try
                 {
                     dt = Convert.ToDateTime(a);
                 }
                 catch 
                 {
                     dt = ClearDate(a);
                 
                 }

             }
             catch
             {
                 string newStr = "";

                 Regex re = new Regex(@"(\d{2,4})年(\d{1,2})月(\d{1,2})日*|(\d{2,4})年(\d{1,2})月*|(\d{1,2})月(\d{1,2})日*|(\d

{2,4})年*", RegexOptions.None);
                     string[] lines = re.Split(a);
                     List<string> dates = new List<string>();
                   


                     int n;
                     if (lines.Length >= 4)
                     {
                         for (int i = 0; i < 4; i++)
                         {
                             if (int.TryParse(lines[i], out n))
                             {
                                 dates.Add(lines[i].ToString()); //为数字
                             }


                         }
                     }
                     else 
                     {
                         for (int i = 0; i < lines.Length; i++)
                         {
                             if (int.TryParse(lines[i], out n))
                             {
                                 dates.Add(lines[i].ToString()); //为数字
                             }


                         }
                     }

                     if (dates.Count() == 1)
                     {
                        
                         newStr = dates[0].ToString()+"-1-1";
                     }
                     else 
                     {
                         for (int s = 0; s < dates.Count(); s++)
                         {
                             if (s == dates.Count() - 1)
                             {
                                 if (dates[s] == "" | dates[s] == "0" | dates[s] == "00")
                                 {
                                     dates[s] = "1";
                                 }
                                 newStr += dates[s].ToString();
                             }
                             else
                             {
                                 if (dates[s] == "" | dates[s] == "0" | dates[s] == "00")
                                 {
                                     dates[s] = "1";
                                 }
                                 newStr += dates[s].ToString() + "-";
                             }

                         }

                     }
                   
                


                 dt = Convert.ToDateTime(newStr);
             }
          return dt;
        
        }


   public DateTime ClearDate(string a)
        {

            Regex r = new Regex(@"([1-9]\d*\-{1}\d*\-{1}\d*)");

            //开始匹配
            Match m = r.Match(a);
            string newStr = "";
            while (m.Success)
            {
                //匹配成功
                newStr += m.Groups[0].Value;

                //从上一个匹配结束的位置开始下一个匹配
                m = m.NextMatch();
            }

          return  Convert.ToDateTime(newStr);
        }

直接调用ConvertTime就可完成转换  

2.带中文的字符串只保留数字和小数点

public double ConvertNumber(string a)
        {

            Regex r = new Regex(@"([1-9]\d*\.?\d*)|(0\.\d*[1-9])");

            //开始匹配
            Match m = r.Match(a);
            string newStr = "";
            while (m.Success)
            {
                //匹配成功
                newStr += m.Groups[0].Value;

                //从上一个匹配结束的位置开始下一个匹配
                m = m.NextMatch();
            }
            if (newStr == "")
            {
                newStr = "0.0";
            }
            return Convert.ToDouble(newStr);
        }

3.去html标志

public static string NoHTML(string Htmlstring)
        {
            //删除脚本
            Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "",
              RegexOptions.IgnoreCase);
            //删除HTML
            Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"([\r\n])[\s]+", "",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "\"",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", "   ",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9",
              RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&#(\d+);", "",
              RegexOptions.IgnoreCase);

            Htmlstring.Replace("<", "");
            Htmlstring.Replace(">", "");
            Htmlstring.Replace("\r\n", "");
           // Htmlstring = System.Web.HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();
            Htmlstring = Htmlstring.Trim();
            return Htmlstring;
        }