在操作系统重启后恢复应用程序的工作状态

 

Windows 10 创意者更新之后，默认开启了重启后恢复应用程序状态的功能。这是自 Vista 以来就提供的功能——Restart Manager。

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应用程序实现这一功能只需要调用 RegisterApplicationRestart 即可。传入两个参数：

1. 重启后使用的命令行参数（例如当前正在打开的文件，以及正在阅读或编辑的位置）
2. 决定是否进行重启的限制标记（任何时候都能重启还是在某些条件下关掉重启功能）

我封装了以下这个函数的调用并将其放到 GitHub 上：sharing-demo/ApplicationRestartManager.cs at master · walterlv/sharing-demo。

调用代码如下：

if (ApplicationRestartManager.IsRestartManagerSupported)
{ApplicationRestartManager.RegisterApplicationRestart(currentOpeningFile,ApplicationRestartFlags.None);
}

附：封装的 ApplicationRestartManager：

using System;
using System.Diagnostics.Contracts;
using System.Runtime.InteropServices;
using System.Windows;
using Jetbrains.Annotations;namespace Walterlv.Win32
{/// <summary>/// 为应用程序提供重启后恢复状态的功能。/// </summary>public class ApplicationRestartManager{/// <summary>/// 获取一个值，该值指示当前操作系统环境是否支持 Restart Manager 功能。/// Restart Manager 是 Windows Vista 新增的功能。在 Windows 10 秋季创意者更新之后，默认开启了 EWX_RESTARTAPPS。/// </summary>public static bool IsSupported => IsSupportedLazy.Value;/// <summary>/// 向操作系统的 Restart Manager 注册应用终止后的重启方式。/// </summary>/// <param name="pwsCommandLine">/// 应用程序的重启时应该使用的参数，允许为 null，表示不带参数。/// 请注意：如果命令行参数中的某一个参数包含空格，请加上引号。/// </param>/// <param name="dwFlags">为应用程序的重启行为添加限制，默认没有限制。</param>/// <returns></returns>public static bool RegisterApplicationRestart([CanBeNull] string pwsCommandLine,ApplicationRestartFlags dwFlags = ApplicationRestartFlags.None){return 0 == RegisterApplicationRestart(pwsCommandLine, (int) dwFlags);}/// <summary>/// Windows Vista 及以上才开启 Restart Manager。/// </summary>[ContractPublicPropertyName(nameof(IsSupported))]private static readonly Lazy<bool> IsSupportedLazy =new Lazy<bool>(() => Environment.OSVersion.Version >= new Version(6, 0));/// <summary>/// Registers the active instance of an application for restart./// See also: [RegisterApplicationRestart function (Windows)](https://msdn.microsoft.com/en-us/library/windows/desktop/aa373347)/// </summary>/// <param name="pwzCommandline">/// A pointer to a Unicode string that specifies the command-line arguments for the application when it is restarted. The maximum size of the command line that you can specify is RESTART_MAX_CMD_LINE characters. Do not include the name of the executable in the command line; this function adds it for you./// If this parameter is NULL or an empty string, the previously registered command line is removed. If the argument contains spaces, use quotes around the argument./// </param>/// <param name="dwFlags">/// This parameter can be 0 or one or more of the following values:/// - 1: Do not restart the process if it terminates due to an unhandled exception./// - 2: Do not restart the process if it terminates due to the application not responding./// - 4: Do not restart the process if it terminates due to the installation of an update./// - 8: Do not restart the process if the computer is restarted as the result of an update./// </param>/// <returns>/// This function returns S_OK on success or one of the following error codes./// - E_FAIL: Internal error./// - E_INVALIDARG: The specified command line is too long./// </returns>[DllImport("kernel32.dll", CharSet = CharSet.Auto)]private static extern uint RegisterApplicationRestart(string pwzCommandline, int dwFlags);}/// <summary>/// 表示重启时的限制标记。/// </summary>[Flags]public enum ApplicationRestartFlags{/// <summary>/// 没有重启限制。如果仅指定 <see cref="None"/>，那么操作系统在可以重启应用程序的时候都会重启应用。/// </summary>None = 0,/// <summary>/// 指定此时不重启：因未处理的异常而导致进程停止工作。/// </summary>RestartNoCrash = 1,/// <summary>/// 指定此时不重启：因应用程序无响应而导致进程停止工作。/// </summary>RestartNoHang = 2,/// <summary>/// 指定此时不重启：因应用安装更新导致进程关闭。/// </summary>RestartNoPatch = 4,/// <summary>/// 指定此时不重启：因操作系统安装更新后重启导致进程关闭。/// </summary>RestartNoReboot = 8}
}

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参考资料

• 为何win10 1709（秋季创意更新） 重启会自动恢复一些程序为重启以前的工作状态？ - 蒋晟的回答 - 知乎
• RegisterApplicationRestart function (Windows)
• pinvoke.net: RegisterApplicationRestart (kernel32)
• Restart Manager Support For Windows Application - CodeProject
• c# - Restart a crashed program with RegisterApplicationRestart without user prompt - Stack Overflow
• Vista Application Crash Recovery in C# - CodeProject
• c# - Restart a crashed program with RegisterApplicationRestart without user prompt - Stack Overflow