将查询结果存储在缓存中

Question

我有一个查询要发送到AD并获取所有电子邮件。我的问题是，查询是否需要相当长的时间才能执行（通过AJAX 15-20秒）以拉动大约3000个电子邮件地址。我正在考虑将结果集（位于列表中）存储在memory cache中。我将这个列表放入一个下拉列表中，用电子邮件填充它。这里是我的查询：

public class EmailDetails 
    { 
     public string EmailAddress { get; set; } 
     public string EmailDisplayName { get; set; } 
    } 

    public List<EmailDetails> EmailInformation { get; set; } 

    [WebMethod] 
    public static List<EmailDetails> GetEmails() 
    { 
     List<EmailDetails> emailAddresses = new List<EmailDetails>(); 

     //queries AD to pull all users 
     var search = new DirectorySearcher(); 
     search.Filter = "(&(objectClass=user)(mail=*)(displayName=*))"; 
     search.PageSize = 1000; 

     using (var results = search.FindAll()) 
     { 
      foreach (SearchResult result in results) 
      { 
       emailAddresses.Add(new EmailDetails 
       { 
        EmailAddress = result.Properties["mail"][0].ToString(), 
        EmailDisplayName = result.Properties["displayName"][0].ToString() 
       }); 
      } 
     } 

     //sort email address list alphabetically and return sorted list 
     List<EmailDetails> sortedEmailAddresses = emailAddresses.OrderBy(o => o.EmailDisplayName).ToList(); 
     return sortedEmailAddresses; 

所以我的困境是，我试图找到一种方法来加快下拉的过程中被加载了返回的列表。什么是实现这一目标的最佳方式？内存缓存？我愿意接受任何您认为合理的选择...

Answer 1

https://msdn.microsoft.com/en-us/library/94xkskdf.aspx将其存储在应用程序中。每次您回收应用程序池时都会清理它，并保持其余时间。没有什么奇特的，这个工作。

[WebMethod] 
public static List<EmailDetails> GetEmails() 
{ 
    if(HttpContext.Current.Application["sortedEmailAddresses"]==null) { 

     List<EmailDetails> emailAddresses = new List<EmailDetails>(); 

     //queries AD to pull all users 
     var search = new DirectorySearcher(); 
     search.Filter = "(&(objectClass=user)(mail=*)(displayName=*))"; 
     search.PageSize = 1000; 

     using (var results = search.FindAll()) 
     { 
      foreach (SearchResult result in results) 
      { 
       emailAddresses.Add(new EmailDetails 
       { 
        EmailAddress = result.Properties["mail"][0].ToString(), 
        EmailDisplayName = result.Properties["displayName"][0].ToString() 
       }); 
      } 
     } 

     //sort email address list alphabetically and return sorted list 
     List<EmailDetails> sortedEmailAddresses = emailAddresses.OrderBy(o => o.EmailDisplayName).ToList(); 
     HttpContext.Current.Application["sortedEmailAddresses"] = sortedEmailAddresses; 
    } 
    return HttpContext.Current.Application["sortedEmailAddresses"] as List<EmailDetails>; 
}