c# - 如何为存储在 .config 文件中的数据执行计划？

Question

在我的应用程序中，数据存储在一个 .config 文件中（以 XML 格式）。用户可以设置他想要邮件的日期（例如通过邮件提醒）。所以应该有一个调度程序，它将每天执行以在目标日期向用户发送邮件。由于没有数据库交互，如何运行调度程序？

我对这项任务完全空白。谁能帮我？

提前致谢。

Answer 1

您可以让应用程序在后台运行，定期检查是否需要执行任务。Windows 服务是我经常用于此类任务的。或者您可以通过编程方式创建一个 Windows 计划任务来运行您的应用程序。

Answer 2

只需使用将运行任何 exe 的 Windows 调度程序服务，或者如果该过程非常复杂，您可以创建自己的服务。

Answer 3

you can use the window scheduler or service which suits you best but apart from that you have the option in web application also through which you can run the scheduled task. For that you have to use the goabal.asax file .It will run after every 60 minutes . global.asax code is as follows ::

<code>
<%@ Application Language="C#" %>

<script runat="server">

    private const string DeliveryPageUrl = "http://put any test url of your application";

    private const string DummyCacheItemKey = "Any hard coded value";  // you can put any name here DummyCacheItemKey = "gigigagagugu";

    void Application_Start(object sender, EventArgs e) 
    {
        // Code that runs on application startup
        RegisterCacheEntry();
    }

    protected void Application_BeginRequest(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() == DeliveryPageUrl)
        {
            // Add the item in cache and when succesful, do the work.
            RegisterCacheEntry();
        }
    }
    /// <summary>
    /// Register a cache entry which expires in 60 minute and gives us a callback.
    /// </summary>
    /// <returns></returns>
    private void RegisterCacheEntry()
    {
        // Prevent duplicate key addition
        if (null != HttpContext.Current.Cache[DummyCacheItemKey]) return;

        HttpContext.Current.Cache.Add(DummyCacheItemKey, "Test", null, DateTime.MaxValue,
                                        TimeSpan.FromMinutes(60), CacheItemPriority.NotRemovable,
                                        new CacheItemRemovedCallback(CacheItemRemovedCallback));
    }
    /// <summary>
    /// Callback method which gets invoked whenever the cache entry expires.
    /// We can do our "service" works here.
    /// </summary>
    /// <param name="key"></param>
    /// <param name="value"></param>
    /// <param name="reason"></param>
    public void CacheItemRemovedCallback(string key, object value, CacheItemRemovedReason reason)
    {
        // We need to register another cache item which will expire again in one
        // minute. However, as this callback occurs without any HttpContext, we do not
        // have access to HttpContext and thus cannot access the Cache object. The
        // only way we can access HttpContext is when a request is being processed which
        // means a webpage is hit. So, we need to simulate a web page hit and then 
        // add the cache item.
        HitPage();
    }

    /// <summary>
    /// Hits a local webpage in order to add another expiring item in cache
    /// </summary>
    private void HitPage()
    {
        System.Net.WebClient client = new System.Net.WebClient();
        client.DownloadData(DeliveryPageUrl);
    }
    void Application_End(object sender, EventArgs e) 
    {
        //  Code that runs on application shutdown

    }

    void Application_Error(object sender, EventArgs e) 
    { 
        // Code that runs when an unhandled error occurs

    }

    void Session_Start(object sender, EventArgs e) 
    {
        // Code that runs when a new session is started

    }

    void Session_End(object sender, EventArgs e) 
    {
        // Code that runs when a session ends. 
        // Note: The Session_End event is raised only when the sessionstate mode
        // is set to InProc in the Web.config file. If session mode is set to StateServer 
        // or SQLServer, the event is not raised.

    }

</script>

   </code>