C# 共享文件读取（转）

using System;
using System.Runtime.InteropServices;
using BOOL = System.Boolean;
using DWORD = System.UInt32;
using LPWSTR = System.String;
using NET_API_STATUS = System.UInt32;

namespace ConnectUNCWithCredentials
{
public class UNCAccessWithCredentials : IDisposable
{
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
internal struct USE_INFO_2
{
internal LPWSTR ui2_local;
internal LPWSTR ui2_remote;
internal LPWSTR ui2_password;
internal DWORD ui2_status;
internal DWORD ui2_asg_type;
internal DWORD ui2_refcount;
internal DWORD ui2_usecount;
internal LPWSTR ui2_username;
internal LPWSTR ui2_domainname;
}

[DllImport("NetApi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
internal static extern NET_API_STATUS NetUseAdd(
LPWSTR UncServerName,
DWORD Level,
ref USE_INFO_2 Buf,
out DWORD ParmError);

[DllImport("NetApi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
internal static extern NET_API_STATUS NetUseDel(
LPWSTR UncServerName,
LPWSTR UseName,
DWORD ForceCond);

private bool disposed = false;

private string sUNCPath;
private string sUser;
private string sPassword;
private string sDomain;
private int iLastError;

/// <summary>
/// A disposeable class that allows access to a UNC resource with credentials.
/// </summary>
public UNCAccessWithCredentials()
{
}

/// <summary>
/// The last system error code returned from NetUseAdd or NetUseDel. Success = 0
/// </summary>
public int LastError
{
get { return iLastError; }
}

public void Dispose()
{
if (!this.disposed)
{
NetUseDelete();
}
disposed = true;
GC.SuppressFinalize(this);
}

/// <summary>
/// Connects to a UNC path using the credentials supplied.
/// </summary>
/// <param name="UNCPath">Fully qualified domain name UNC path</param>
/// <param name="User">A user with sufficient rights to access the path.</param>
/// <param name="Domain">Domain of User.</param>
/// <param name="Password">Password of User</param>
/// <returns>True if mapping succeeds. Use LastError to get the system error code.</returns>
public bool NetUseWithCredentials(string UNCPath, string User, string Domain, string Password)
{
sUNCPath = UNCPath;
sUser = User;
sPassword = Password;
sDomain = Domain;
return NetUseWithCredentials();
}

private bool NetUseWithCredentials()
{
uint returncode;
try
{
USE_INFO_2 useinfo = new USE_INFO_2();

useinfo.ui2_remote = sUNCPath;
useinfo.ui2_username = sUser;
useinfo.ui2_domainname = sDomain;
useinfo.ui2_password = sPassword;
useinfo.ui2_asg_type = 0;
useinfo.ui2_usecount = 1;
uint paramErrorIndex;
returncode = NetUseAdd(null, 2, ref useinfo, out paramErrorIndex);
iLastError = (int)returncode;
return returncode == 0;
}
catch
{
iLastError = Marshal.GetLastWin32Error();
return false;
}
}

/// <summary>
/// Ends the connection to the remote resource
/// </summary>
/// <returns>True if it succeeds. Use LastError to get the system error code</returns>
public bool NetUseDelete()
{
uint returncode;
try
{
returncode = NetUseDel(null, sUNCPath, 2);
iLastError = (int)returncode;
return (returncode == 0);
}
catch
{
iLastError = Marshal.GetLastWin32Error();
return false;
}
}

~UNCAccessWithCredentials()
{
Dispose();
}

}
}