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