Question

我在Global.asax上有以下代码。它通常会生成电子邮件警报。我的问题是我已经设置每24小时发送一封电子邮件，但代码每10分钟发送一次电子邮件。我已经设定了：

HttpContext.Current.Cache.Add(CacheItemKey, "Test", null,
               DateTime.MaxValue, TimeSpan.FromHours(24)

但应用程序每10分钟发送一次电子邮件。我也尝试了几分钟。

我的代码：

private const string CacheItemKey = "CacheFromMe";

        public void CacheIRemovedCallback(string key,
            object value, CacheItemRemoved reason)
        {


           HitmyPage();

            // Do the service works

           DosomeWork();
        }
        private const string myPageUrl = "myurl.aspx";

        private void HitmyPage()
        {

            WebClient myclient = new WebClient();
            myclient.DownloadData(myPageUrl);
        }
        protected void Application_BegintheRequests(Object sender, EventArgs e)
        {
            // If the dummy page is hit, then it means we want to add another item

           // in cache

           if (HttpContext.Current.Request.Url.ToString() == myPageUrl)
           {
              // Add the item in cache and when succesful, do the work.

                RegistermyCacheEntries();
           }
        }
        private void DosomeWork()
        {

            DoEmailStuff();
           AnotherEmailStuff();

        }
        private void DoEmailStuff()
        {

        //    Statment For Sending The Email under conditions



        }
        private void AnotherEmailStuff()
        {
        //    Another Statment for Sending Email

        }
 void Application_Start(object sender, EventArgs e)
        {
            RegistermyCacheEntries();

        }
        private bool RegistermyCacheEntries()
        {
           if (null != HttpContext.Current.Cache[CacheItemKey]) return false;

           HttpContext.Current.Cache.Add(CacheItemKey, "Test", null,
               DateTime.MaxValue, TimeSpan.FromHours(24),
               CacheItemPriority.Normal,
                new CacheIRemovedCallback(CacheIRemovedCallback));

           return true;
        }

Answer 1

试试这个：

HttpContext.Current.Cache.Add(CacheItemKey, "Test", null,
              DateTime.Now.AddHours(24), System.Web.Caching.Cache.NoSlidingExpiration,
              CacheItemPriority.Normal,
              new CacheIRemovedCallback(CacheIRemovedCallback));

Syntax as in MSDN:

public Object Add(
    string key,
    Object value,
    CacheDependency dependencies,
    DateTime absoluteExpiration,
    TimeSpan slidingExpiration,
    CacheItemPriority priority,
    CacheItemRemovedCallback onRemoveCallback
)

保证项目在缓存中保留至少10分钟，这是默认设置。因此，每10分钟发送一次电子邮件意味着设置到期时间不成功。您可以使用absoluteExpiration和slidingExpiration参数更改它。但我怀疑这个问题还存在于其他地方。尝试插入而不是添加方法，如here

所示

自动电子邮件机制

1 个答案: