57 lines
1.8 KiB
C#
57 lines
1.8 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="ConnectivityStatus.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.ClientServices
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{
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using System;
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using System.IO;
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using System.Security.Principal;
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using System.Security;
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using System.Security.Permissions;
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using System.Security.AccessControl;
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public static class ConnectivityStatus
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{
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public static bool IsOffline {
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get {
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if (!_IsOfflineFetched)
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FetchIsOffline();
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return _IsOffline;
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}
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set {
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if (IsOffline != value) {
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_IsOffline = value;
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StoreIsOffline();
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}
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}
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}
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private static bool _IsOffline;
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private static bool _IsOfflineFetched;
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//[PermissionSet(SecurityAction.Assert, Unrestricted = true)]
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private static void FetchIsOffline()
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{
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string path = Path.Combine(System.Windows.Forms.Application.UserAppDataPath, "AppIsOffline");
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_IsOffline = File.Exists(path);
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_IsOfflineFetched = true;
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}
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//[PermissionSet(SecurityAction.Assert, Unrestricted = true)]
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private static void StoreIsOffline()
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{
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string path = Path.Combine(System.Windows.Forms.Application.UserAppDataPath, "AppIsOffline");
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if (!_IsOffline) {
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File.Delete(path);
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} else {
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using (FileStream fs = File.Create(path)) {
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fs.Write(new byte[0], 0, 0);
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}
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}
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}
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}
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}
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