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//------------------------------------------------------------------------------
// <copyright file="SqlDataSourceCache.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI {
using System.Collections;
using System.ComponentModel;
using System.Web.Caching;
internal sealed class SqlDataSourceCache : DataSourceCache {
internal const string Sql9CacheDependencyDirective = "CommandNotification";
/// <devdoc>
/// A semi-colon delimited string indicating which databases to use for the dependency in the format "database1:table1;database2:table2".
/// </devdoc>
public string SqlCacheDependency {
get {
object o = ViewState["SqlCacheDependency"];
if (o != null)
return (string)o;
return String.Empty;
}
set {
ViewState["SqlCacheDependency"] = value;
}
}
#if !FEATURE_PAL // FEATURE_PAL does not fully enable SQL dependencies
/// <devdoc>
/// Saves data to the ASP.NET cache using the specified key.
/// </devdoc>
protected override void SaveDataToCacheInternal(string key, object data, CacheDependency dependency) {
string sqlCacheDependency = SqlCacheDependency;
// Here we only create cache dependencies for SQL Server 2000 and
// earlier that use a polling based mechanism. For SQL Server 2005
// and after, the data source itself creates the SqlCacheDependency
// and passes it in as a parameter.
if (sqlCacheDependency.Length > 0 && !String.Equals(sqlCacheDependency, Sql9CacheDependencyDirective, StringComparison.OrdinalIgnoreCase)) {
// Call internal helper method to parse the dependency list
CacheDependency sqlDependency = System.Web.Caching.SqlCacheDependency.CreateOutputCacheDependency(sqlCacheDependency);
if (dependency != null) {
// There was another dependency passed in, aggregate them
AggregateCacheDependency aggregateDependency = new AggregateCacheDependency();
aggregateDependency.Add(sqlDependency, dependency);
dependency = aggregateDependency;
}
else {
// No other dependencies, just the SQL one
dependency = sqlDependency;
}
}
base.SaveDataToCacheInternal(key, data, dependency);
}
#endif // !FEATURE_PAL
}
}
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