76 lines
2.8 KiB
C#
76 lines
2.8 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Text;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Collections.Specialized;
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using System.Diagnostics;
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using System.Web.Resources;
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using System.Globalization;
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using System.Web.Caching;
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using System.Web.Hosting;
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namespace System.Web.DynamicData {
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delegate void FileChangedCallback(string path);
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class FileChangeNotifier {
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private static VirtualPathProvider _vpp;
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internal static VirtualPathProvider VirtualPathProvider {
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private get {
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if (_vpp == null) {
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_vpp = HostingEnvironment.VirtualPathProvider;
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}
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return _vpp;
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}
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// For unit test purpose
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set {
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_vpp = value;
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}
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}
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1806:DoNotIgnoreMethodResults",
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MessageId = "System.Web.DynamicData.FileChangeNotifier",
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Justification="The object deals with file change notifications and we don't need to hold on to it")]
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internal static void Register(string virtualPath, FileChangedCallback onFileChanged) {
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new FileChangeNotifier(virtualPath, onFileChanged);
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}
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private FileChangedCallback _onFileChanged;
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private FileChangeNotifier(string virtualPath, FileChangedCallback onFileChanged) {
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_onFileChanged = onFileChanged;
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RegisterForNextNotification(virtualPath);
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}
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private void RegisterForNextNotification(string virtualPath) {
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// Get a CacheDependency from the BuildProvider, so that we know anytime something changes
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var virtualPathDependencies = new List<string>();
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virtualPathDependencies.Add(virtualPath);
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CacheDependency cacheDependency = VirtualPathProvider.GetCacheDependency(
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virtualPath, virtualPathDependencies, DateTime.UtcNow);
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// Rely on the ASP.NET cache for file change notifications, since FileSystemWatcher
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// doesn't work in medium trust
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HttpRuntime.Cache.Insert(virtualPath /*key*/, virtualPath /*value*/, cacheDependency,
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Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,
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CacheItemPriority.NotRemovable, new CacheItemRemovedCallback(OnCacheItemRemoved));
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}
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private void OnCacheItemRemoved(string key, object value, CacheItemRemovedReason reason) {
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// We only care about dependency changes
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if (reason != CacheItemRemovedReason.DependencyChanged)
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return;
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_onFileChanged(key);
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// We need to register again to get the next notification
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RegisterForNextNotification(key);
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}
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}
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}
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