ASP.NET C#截断

从我头上掉下来,像这样?

public static string EncodeAndTrimText(this HtmlHelper helper, string text)
{
   string result = string.Empty;
   result = HttpUtility.HtmlEncode(result);
   if (result.length > 40)
      return result.Substring(0, 40) + "...";
   return result;
}

HttpUtility.HtmlEncode将只对 <p> result = result.Replace("<p>", string.Empty);

用法:

<% Html.EncodeAndTrimText(Model.SomeProperty) %>

<%= String.Format("{0:40}...", m.article.Replace("<p>", string.Empty).Replace("</p>", string.Empty) %>

我有一些功能可以满足你的要求。它使用正则表达式来去除html。下面是一个示例程序:

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {    
            string s = @"<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>";    

            Console.WriteLine(Truncate(StripHTML(s), 40) + "...");
            Console.ReadLine();
        }    

        public static string StripHTML(string html)
        {
            return RegularExpressions.Regex.Replace(html, @"<.*?>", string.Empty, RegularExpressions.RegexOptions.IgnoreCase);    
        }

        public static string Truncate(string input, int length)
        {
            bool isTruncated = true;

            if (input.Length > length)
            {
                char[] TextEnds = { ' ', '\n', '\r', '\0', '\f', '\t', '\v' };
                string temp = input.Substring(0, length + 1);
                string temp2 = temp.TrimEnd(TextEnds);

                if (temp2 == temp)
                {
                    //we truncated in the middle of a word
                    temp2 = temp.Substring(0, temp.LastIndexOfAny(TextEnds));    
                }
                else
                {
                    //we did not truncate in the middle of a word
                    //now we just need to return temp2 

                    //we do need to determine if the actual text of the word 
                    //changed before we decide if we have really truncated the
                    if (temp2 == input.TrimEnd(TextEnds))
                        isTruncated = false;    
                }                    
                return temp2;
            }
            else
            {    
                return input;
            }    
        }    
    }
}

我通过在Models类中添加一个函数来实现这一点,例如:

namespace InventorySystem.Models
{
    public class InventoryItem
    {
       public Int Id { get; set; }
       public string Notes { get; set; }
       ...
       public string NotesTruncated
       {
           get
           {
               //you could add some additional code here to remove the <p>
               return (Notes.Length > 50) ? Notes.Substring(0, 50) + "..." : Notes;
           }
       }
    }
}