使用 C# 关闭打开的文件

我遇到过一种情况，人们连接到共享上的文件，并且它阻止我覆盖该文件。我正在尝试编写一个方法，该方法将查看我提供的文件路径当前是否以这种方式锁定并关闭该资源的网络会话。

我查看了 ADSI Winnt 提供程序，但 Resources.Remove 成员未实现。然后我查看了 Win32_ServerSession，虽然我能够使用删除成员，但它会杀死给定用户的所有资源。我需要弄清楚如何更具体。

我一直在走 GetRelationsShips 和 Properties 但我现在只是被难住了。

您可以使用提供完整文件路径的代码，它将返回List<Processes>锁定该文件的任何内容：

using System.Runtime.InteropServices;
using System.Diagnostics;

static public class FileUtil
{
    [StructLayout(LayoutKind.Sequential)]
    struct RM_UNIQUE_PROCESS
    {
        public int dwProcessId;
        public System.Runtime.InteropServices.ComTypes.FILETIME ProcessStartTime;
    }

    const int RmRebootReasonNone = 0;
    const int CCH_RM_MAX_APP_NAME = 255;
    const int CCH_RM_MAX_SVC_NAME = 63;

    enum RM_APP_TYPE
    {
        RmUnknownApp = 0,
        RmMainWindow = 1,
        RmOtherWindow = 2,
        RmService = 3,
        RmExplorer = 4,
        RmConsole = 5,
        RmCritical = 1000
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    struct RM_PROCESS_INFO
    {
        public RM_UNIQUE_PROCESS Process;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCH_RM_MAX_APP_NAME + 1)]
        public string strAppName;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCH_RM_MAX_SVC_NAME + 1)]
        public string strServiceShortName;

        public RM_APP_TYPE ApplicationType;
        public uint AppStatus;
        public uint TSSessionId;
        [MarshalAs(UnmanagedType.Bool)]
        public bool bRestartable;
    }

    [DllImport("rstrtmgr.dll", CharSet = CharSet.Unicode)]
    static extern int RmRegisterResources(uint pSessionHandle,
                                          UInt32 nFiles,
                                          string[] rgsFilenames,
                                          UInt32 nApplications,
                                          [In] RM_UNIQUE_PROCESS[] rgApplications,
                                          UInt32 nServices,
                                          string[] rgsServiceNames);

    [DllImport("rstrtmgr.dll", CharSet = CharSet.Auto)]
    static extern int RmStartSession(out uint pSessionHandle, int dwSessionFlags, string strSessionKey);

    [DllImport("rstrtmgr.dll")]
    static extern int RmEndSession(uint pSessionHandle);

    [DllImport("rstrtmgr.dll")]
    static extern int RmGetList(uint dwSessionHandle,
                                out uint pnProcInfoNeeded,
                                ref uint pnProcInfo,
                                [In, Out] RM_PROCESS_INFO[] rgAffectedApps,
                                ref uint lpdwRebootReasons);

    /// <summary>
    /// Find out what process(es) have a lock on the specified file.
    /// </summary>
    /// <param name="path">Path of the file.</param>
    /// <returns>Processes locking the file</returns>
    /// <remarks>See also:
    /// http://msdn.microsoft.com/en-us/library/windows/desktop/aa373661(v=vs.85).aspx
    /// http://wyupdate.googlecode.com/svn-history/r401/trunk/frmFilesInUse.cs (no copyright in code at time of viewing)
    /// 
    /// </remarks>
    static public List<Process> WhoIsLocking(string path)
    {
        uint handle;
        string key = Guid.NewGuid().ToString();
        List<Process> processes = new List<Process>();

        int res = RmStartSession(out handle, 0, key);
        if (res != 0) throw new Exception("Could not begin restart session.  Unable to determine file locker.");

        try
        {
            const int ERROR_MORE_DATA = 234;
            uint pnProcInfoNeeded = 0,
                 pnProcInfo = 0,
                 lpdwRebootReasons = RmRebootReasonNone;

            string[] resources = new string[] { path }; // Just checking on one resource.

            res = RmRegisterResources(handle, (uint)resources.Length, resources, 0, null, 0, null);

            if (res != 0) throw new Exception("Could not register resource.");                                    

            //Note: there's a race condition here -- the first call to RmGetList() returns
            //      the total number of process. However, when we call RmGetList() again to get
            //      the actual processes this number may have increased.
            res = RmGetList(handle, out pnProcInfoNeeded, ref pnProcInfo, null, ref lpdwRebootReasons);

            if (res == ERROR_MORE_DATA)
            {
                // Create an array to store the process results
                RM_PROCESS_INFO[] processInfo = new RM_PROCESS_INFO[pnProcInfoNeeded];
                pnProcInfo = pnProcInfoNeeded;

                // Get the list
                res = RmGetList(handle, out pnProcInfoNeeded, ref pnProcInfo, processInfo, ref lpdwRebootReasons);
                if (res == 0)
                {
                    processes = new List<Process>((int)pnProcInfo);

                    // Enumerate all of the results and add them to the 
                    // list to be returned
                    for (int i = 0; i < pnProcInfo; i++)
                    {
                        try
                        {
                            processes.Add(Process.GetProcessById(processInfo[i].Process.dwProcessId));
                        }
                        // catch the error -- in case the process is no longer running
                        catch (ArgumentException) { }
                    }
                }
                else throw new Exception("Could not list processes locking resource.");                    
            }
            else if (res != 0) throw new Exception("Could not list processes locking resource. Failed to get size of result.");                    
        }
        finally
        {
            RmEndSession(handle);
        }

        return processes;
    }
}

然后，迭代进程列表并关闭它们：

    string[] files = Directory.GetFiles(target_dir);
    List<Process> lstProcs = new List<Process>();

    foreach (string file in files)
    {
        lstProcs = ProcessHandler.WhoIsLocking(file);
        if (lstProcs.Count > 0) // deal with the file lock
        {
            foreach (Process p in lstProcs)
            {
                if (p.MachineName == ".")
                    ProcessHandler.localProcessKill(p.ProcessName);
                else
                    ProcessHandler.remoteProcessKill(p.MachineName, txtUserName.Text, txtPassword.Password, p.ProcessName);
            }
        }
    }

并取决于文件是否位于本地计算机上：

public static void localProcessKill(string processName)
{
    foreach (Process p in Process.GetProcessesByName(processName))
    {
        p.Kill();
    }
}

或网络计算机：

public static void remoteProcessKill(string computerName, string fullUserName, string pword, string processName)
{
    var connectoptions = new ConnectionOptions();
    connectoptions.Username = fullUserName;  // @"YourDomainName\UserName";
    connectoptions.Password = pword;

    ManagementScope scope = new ManagementScope(@"\\" + computerName + @"\root\cimv2", connectoptions);

    // WMI query
    var query = new SelectQuery("select * from Win32_process where name = '" + processName + "'");

    using (var searcher = new ManagementObjectSearcher(scope, query))
    {
        foreach (ManagementObject process in searcher.Get()) 
        {
            process.InvokeMethod("Terminate", null);
            process.Dispose();
        }
    }
}

参考：
如何使用 .NET 找出哪个进程正在锁定文件？

删除某人打开过文件的目录