私はSQLCacheDependency
自分のASP.NET
アプリケーションでQuery Notifications
. この記事に従って、データベースを正常にセットアップしました。ただし、オブジェクトにデータを保存しようとすると、cache
常に値が保持されませんnull
。エラーや例外は発生しません。これが私のコードです
Global.asax
void Application_Start(object sender, EventArgs e)
{
// Code that runs on application startup
System.Data.SqlClient.SqlDependency.
Start(ConfigurationManager.ConnectionStrings["McdConn"].ToString());
}
void Application_End(object sender, EventArgs e)
{
// Code that runs on application shutdown
System.Data.SqlClient.SqlDependency.
Stop(ConfigurationManager.ConnectionStrings["McdConn"].ToString());
}
public static class CacheManagement
{
public static DataTable CreateCache(string cacheName, string tableName, string query)
{
DataTable dtResult = new DataTable();
try
{
string connectionString = ConfigurationManager.ConnectionStrings["McdConn"].ToString();
dtResult = HttpContext.Current.Cache[cacheName] as DataTable;
if (dtResult == null)
{
dtResult = new DataTable();
using (var cn = new SqlConnection(connectionString))
{
cn.Open();
var cmd = new SqlCommand(query, cn);
cmd.Notification = null;
cmd.NotificationAutoEnlist = true;
SqlCacheDependencyAdmin.EnableNotifications(connectionString);
if (!SqlCacheDependencyAdmin.GetTablesEnabledForNotifications(connectionString).Contains(tableName))
{
SqlCacheDependencyAdmin.EnableTableForNotifications(connectionString,tableName);
}
var dependency = new SqlCacheDependency(cmd);
//SqlDataAdapter ad = new SqlDataAdapter(cmd);
//ad.Fill(dsResult);
SqlDataReader reader = cmd.ExecuteReader();
dtResult.Load(reader);
HttpContext.Current.Cache.Insert(cacheName, dtResult, dependency);
}
}
}
catch (Exception ex)
{
Exception_Log.ExceptionMethod("Web", "CacheManagement.cs", "CacheManagement", ex);
}
return dtResult = HttpContext.Current.Cache[cacheName] as DataTable;
}
}
コードビハインド
var dtCachedCategories = HttpContext.Current.Cache["tbl_CategoryMaster_Cached"] as DataTable;
if (dtCachedCategories == null)
{
dtCachedCategories = CacheManagement.CreateCache("tbl_CategoryMaster_Cached","dbo.tbl_CategoryMaster_Languages", "Select * from dbo.tbl_CategoryMaster_Languages");
}
上記は常に を返しますnull
。
何が欠けている可能性があるかを指摘するのを手伝ってくれる人はいますか?