ASP.NET中使用网络驱动器

搞了一个图片站点，图片放在机器A，后台管理网站放在机器B。既然是管理，少不了要对图片进行删除什么的。那象我们这种情况，该如何处理？

1、可以在机器A搞个WebService

2、也可以在机器A搞个远程调用

3、在机器A上将图片存放目录共享，然后机器B映射为网络驱动器

决定采用方法3。

步骤如下：

0、假设机器A（图片服务器）， 计算机名为jsj-01，IP为192.168.0.1；

      机器B（后台管理网站）

1、机器A和机器B都分别建立一个名字、密码相同的帐号，比如coder/123456。

2、机器A上将图片目录共享（img），将coder赋予读写权限。注意 共享和安全 两个地方都要赋。

3、新建两个类，代码如下（照抄可也，我也是抄的）

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Runtime.InteropServices;public class WNetHelper{    [DllImport("mpr.dll", EntryPoint = "WNetAddConnection2")]    private static extern uint WNetAddConnection2(NetResource lpNetResource, string lpPassword, string lpUsername, uint dwFlags);    [DllImport("Mpr.dll", EntryPoint = "WNetCancelConnection2")]    private static extern uint WNetCancelConnection2(string lpName, uint dwFlags, bool fForce);    [StructLayout(LayoutKind.Sequential)]    public class NetResource    {        public int dwScope;        public int dwType;        public int dwDisplayType;        public int dwUsage;        public string lpLocalName;        public string lpRemoteName;        public string lpComment;        public string lpProvider;    }    /// <summary>    /// 为网络共享做本地映射    /// </summary>    /// <param name="username">访问用户名（windows系统需要加计算机名，如：comp-1\user-1）</param>    /// <param name="password">访问用户密码</param>    /// <param name="remoteName">网络共享路径（如：\\192.168.0.9\share）</param>    /// <param name="localName">本地映射盘符</param>    /// <returns></returns>    public static uint WNetAddConnection(string username, string password, string remoteName, string localName)    {        NetResource netResource = new NetResource();        netResource.dwScope = 2;        netResource.dwType = 1;        netResource.dwDisplayType = 3;        netResource.dwUsage = 1;        netResource.lpLocalName = localName;        netResource.lpRemoteName = remoteName.TrimEnd('\\');        uint result = WNetAddConnection2(netResource, password, username, 0);        return result;    }    public static uint WNetCancelConnection(string name, uint flags, bool force)    {        uint nret = WNetCancelConnection2(name, flags, force);        return nret;    }}public class LogonImpersonate : IDisposable{    static public string DefaultDomain    {        get        {            return ".";        }    }    const int LOGON32_LOGON_INTERACTIVE = 2;    const int LOGON32_PROVIDER_DEFAULT = 0;    [System.Runtime.InteropServices.DllImport("Kernel32.dll")]    extern static int FormatMessage(int flag, ref   IntPtr source, int msgid, int langid, ref   string buf, int size, ref   IntPtr args);    [System.Runtime.InteropServices.DllImport("Kernel32.dll")]    extern static bool CloseHandle(IntPtr handle);    [System.Runtime.InteropServices.DllImport("Advapi32.dll", SetLastError = true)]    extern static bool LogonUser(    string lpszUsername,    string lpszDomain,    string lpszPassword,    int dwLogonType,    int dwLogonProvider,    ref   IntPtr phToken    );    IntPtr token;    System.Security.Principal.WindowsImpersonationContext context;    public LogonImpersonate(string username, string password)    {        if (username.IndexOf("\\") == -1)        {            Init(username, password, DefaultDomain);        }        else        {            string[] pair = username.Split(new char[] { '\\' }, 2);            Init(pair[1], password, pair[0]);        }    }    public LogonImpersonate(string username, string password, string domain)    {        Init(username, password, domain);    }    void Init(string username, string password, string domain)    {        if (LogonUser(username, domain, password, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, ref   token))        {            bool error = true;            try            {                context = System.Security.Principal.WindowsIdentity.Impersonate(token);                error = false;            }            finally            {                if (error)                    CloseHandle(token);            }        }        else        {            int err = System.Runtime.InteropServices.Marshal.GetLastWin32Error();            IntPtr tempptr = IntPtr.Zero;            string msg = null;            FormatMessage(0x1300, ref   tempptr, err, 0, ref   msg, 255, ref   tempptr);            throw (new Exception(msg));        }    }    ~LogonImpersonate()    {        Dispose();    }    public void Dispose()    {        if (context != null)        {            try            {                context.Undo();            }            finally            {                CloseHandle(token);                context = null;            }        }    }}

4、然后在后台管理网站中使用这个网路驱动器Z。使用的方法就是引用新写的这个类

    protected void btnDelete_Click(object sender, EventArgs e)    {        //删除图片        using (LogonImpersonate imper = new LogonImpersonate("code", "123456"))        {            uint state = 0;            if (!Directory.Exists("w:"))            {                state = WNetHelper.WNetAddConnection(@"jsj-01\coder", "123456", @"\\192.168.0.1\Img", "z:");            }            if (!state.Equals(0))            {                throw new Exception("添加网络驱动器错误，错误号：" + state.ToString());            }             File.Delete(图片路径);        }    }

将共享目录映射为Z。

首先是将IIS的账户替换，然后访问网络驱动器。注意用上了using，目的是只在访问该网络驱动器的时候使用，用完即弃，恢复默认身份，否则其他的操作就不行了。

参考文章

http://www.cnblogs.com/sqzhuyi/archive/2011/01/15/aspnet-remote.html