Is there a method in C# to retrieve the user name from a given session id?
(any session running on the system)
The Win API function WTSQuerySessionInformation does this, but I'm searching for this functionality in C#.
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stackoverflow.com/questions/6061143/…C Sharper– C Sharper2013-10-21 06:29:14 +00:00Commented Oct 21, 2013 at 6:29
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@ThirdBattleOfPanipat: This is more complicated than WTSQuerySessionInformation is - and it's also Win API, not plain C#. So there's no method in the .NET framework?joe– joe2013-10-21 06:33:33 +00:00Commented Oct 21, 2013 at 6:33
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There is no concept of "user name" associated with ASP.Net sessions... What exactly "user name" you want to get?Alexei Levenkov– Alexei Levenkov2013-10-21 07:06:09 +00:00Commented Oct 21, 2013 at 7:06
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@AlexeiLevenkov: This is used by a desktop allication, no ASP here.joe– joe2013-10-21 07:11:27 +00:00Commented Oct 21, 2013 at 7:11
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.NET is focused on end-user and web applications, so as a general rule it excludes the more hard-core system management functions. I'd be surprised if it contained a terminal services API.Harry Johnston– Harry Johnston2013-10-22 01:02:01 +00:00Commented Oct 22, 2013 at 1:02
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1 Answer
There seems to be no .NET integrated method for this.
So this is the current solution, using Windows Terminal services API:
[DllImport("Wtsapi32.dll")]
private static extern bool WTSQuerySessionInformation(IntPtr hServer, int sessionId, WtsInfoClass wtsInfoClass, out System.IntPtr ppBuffer, out int pBytesReturned);
[DllImport("Wtsapi32.dll")]
private static extern void WTSFreeMemory(IntPtr pointer);
public enum WtsInfoClass
{
WTSInitialProgram,
WTSApplicationName,
WTSWorkingDirectory,
WTSOEMId,
WTSSessionId,
WTSUserName,
WTSWinStationName,
WTSDomainName,
WTSConnectState,
WTSClientBuildNumber,
WTSClientName,
WTSClientDirectory,
WTSClientProductId,
WTSClientHardwareId,
WTSClientAddress,
WTSClientDisplay,
WTSClientProtocolType,
WTSIdleTime,
WTSLogonTime,
WTSIncomingBytes,
WTSOutgoingBytes,
WTSIncomingFrames,
WTSOutgoingFrames,
WTSClientInfo,
WTSSessionInfo,
}
public static string GetUsernameBySessionId(int sessionId, bool prependDomain) {
IntPtr buffer;
int strLen;
string username = "SYSTEM";
if (WTSQuerySessionInformation(IntPtr.Zero, sessionId, WtsInfoClass.WTSUserName, out buffer, out strLen) && strLen > 1) {
username = Marshal.PtrToStringAnsi(buffer);
WTSFreeMemory(buffer);
if (prependDomain) {
if (WTSQuerySessionInformation(IntPtr.Zero, sessionId, WtsInfoClass.WTSDomainName, out buffer, out strLen) && strLen > 1) {
username = Marshal.PtrToStringAnsi(buffer) + "\\" + username;
WTSFreeMemory(buffer);
}
}
}
return username;
}
