1、函数的参数选择有问题，和自己的环境不相符。
比如
public static extern int LogonUser(String lpszUserName,
String lpszDomain,
String lpszPassword,
int dwLogonType,
int dwLogonProvider,
ref IntPtr phToken);
中的dwLogonType，要访问远程资源就要用LOGON32_LOGON_NEW_CREDENTIALS，
要模拟本机用户就要用LOGON32_LOGON_INTERACTIVE。
2、函数的参数格式有问题。
a、比如
public static extern int LogonUser(String lpszUserName,
String lpszDomain,
String lpszPassword,
int dwLogonType,
int dwLogonProvider,
ref IntPtr phToken);
中的lpszUserName、lpszDomain、lpszPassword就要写清楚。
我就在这遇到过问题，第一次测试时，远程服务器就是一台独立的文件服务器，这是我的调用方式：
LogonUser("myname", "192.168.1.48", "password", LOGON32_LOGON_NEW_CREDENTIALS,
LOGON32_PROVIDER_DEFAULT, ref token);
第二次测试时，远程服务器是域MyDomain中的一个成员服务器，提供文件服务。这时代码就应该是：
LogonUser("myname", "MyDomain", "password", LOGON32_LOGON_NEW_CREDENTIALS,
LOGON32_PROVIDER_DEFAULT, ref token);
注意，代码中是MyDomain而不是IP地址。
b、再如：
参考上面代码
string remote = @"\\192.168.1.48\generals";
string local = @"P:";
string username = @"Domain\UserName";
string password = @"Password";
如果@"\\192.168.1.48\generals"变成@"\\192.168.1.48\generals\”就会出错；
如果是域中的用户，那么把@"Domain\UserName"变成@"UserName"就会出错
--/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
public enum LogonType
{
/// <summary>
/// This logon type is intended for users who will be interactively using the computer, such as a user being logged on
/// by a terminal server, remote shell, or similar process.
/// This logon type has the additional expense of caching logon information for disconnected operations;
/// therefore, it is inappropriate for some client/server applications,
/// such as a mail server.
/// </summary>
LOGON32_LOGON_INTERACTIVE = 2,
/// <summary>
/// This logon type is intended for high performance servers to authenticate plaintext passwords.
/// The LogonUser function does not cache credentials for this logon type.
/// </summary>
LOGON32_LOGON_NETWORK = 3,
/// <summary>
/// This logon type is intended for batch servers, where processes may be executing on behalf of a user without
/// their direct intervention. This type is also for higher performance servers that process many plaintext
/// authentication attempts at a time, such as mail or Web servers.
/// The LogonUser function does not cache credentials for this logon type.
/// </summary>
LOGON32_LOGON_BATCH = 4,
/// <summary>
/// Indicates a service-type logon. The account provided must have the service privilege enabled.
/// </summary>
LOGON32_LOGON_SERVICE = 5,
/// <summary>
/// This logon type is for GINA DLLs that log on users who will be interactively using the computer.
/// This logon type can generate a unique audit record that shows when the workstation was unlocked.
/// </summary>
LOGON32_LOGON_UNLOCK = 7,
/// <summary>
/// This logon type preserves the name and password in the authentication package, which allows the server to make
/// connections to other network servers while impersonating the client. A server can accept plaintext credentials
/// from a client, call LogonUser, verify that the user can access the system across the network, and still
/// communicate with other servers.
/// NOTE: Windows NT: This value is not supported.
/// </summary>
LOGON32_LOGON_NETWORK_CLEARTEXT = 8,
/// <summary>
/// This logon type allows the caller to clone its current token and specify new credentials for outbound connections.
/// The new logon session has the same local identifier but uses different credentials for other network connections.
/// NOTE: This logon type is supported only by the LOGON32_PROVIDER_WINNT50 logon provider.
/// NOTE: Windows NT: This value is not supported.
/// </summary>
LOGON32_LOGON_NEW_CREDENTIALS = 9,
}
public enum LogonProvider
{
/// <summary>
/// Use the standard logon provider for the system.
/// The default security provider is negotiate, unless you pass NULL for the domain name and the user name
/// is not in UPN format. In this case, the default provider is NTLM.
/// NOTE: Windows 2000/NT: The default security provider is NTLM.
/// </summary>
LOGON32_PROVIDER_DEFAULT = 0,
}
--/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
const int LOGON32_LOGON_INTERACTIVE = 2;
const int LOGON32_LOGON_NETWORK = 3;
const int LOGON32_LOGON_BATCH = 4;
const int LOGON32_LOGON_SERVICE = 5;
const int LOGON32_LOGON_UNLOCK = 7;
const int LOGON32_LOGON_NETWORK_CLEARTEXT = 8;
const int LOGON32_LOGON_NEW_CREDENTIALS = 9;
const int LOGON32_PROVIDER_DEFAULT = 0;
