Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/FileDataSourceCache.cs

@@ -0,0 +1,55 @@
+//------------------------------------------------------------------------------
+// <copyright file="FileDataSourceCache.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+namespace System.Web.UI {
+
+    using System.Collections.Specialized;
+    using System.Web.Caching;
+
+
+    internal sealed class FileDataSourceCache : DataSourceCache {
+
+        private StringCollection _fileDependencies;
+
+
+        /// <devdoc>
+        /// Sets the list of files that the cache entry will be dependent on.
+        /// These values are not stored in view state.
+        /// </devdoc>
+        public StringCollection FileDependencies {
+            get {
+                if (_fileDependencies == null) {
+                    _fileDependencies = new StringCollection();
+                }
+                return _fileDependencies;
+            }
+        }
+
+
+        /// <devdoc>
+        /// Saves data to the ASP.NET cache using the specified key.
+        /// </devdoc>
+        protected override void SaveDataToCacheInternal(string key, object data, CacheDependency dependency) {
+            int fileCount = FileDependencies.Count;
+            string[] filenames = new string[fileCount];
+            FileDependencies.CopyTo(filenames, 0);
+            CacheDependency fileDependency = new CacheDependency(0, filenames);
+
+            if (dependency != null) {
+                // There was another dependency passed in, aggregate them
+                AggregateCacheDependency aggregateDependency = new AggregateCacheDependency();
+                aggregateDependency.Add(fileDependency, dependency);
+                dependency = aggregateDependency;
+            }
+            else {
+                // No other dependencies, just the file one
+                dependency = fileDependency;
+            }
+
+            base.SaveDataToCacheInternal(key, data, dependency);
+        }
+    }
+}
+