How to get current Windows Login Name in C# Web APP?

Question

How can I get the user name of Windows Login? I used these methods:

• Environment.UserName
• WindowsIdentity.GetCurrent().Name;

But, when I PUT this inside IIS server, it takes the name of the server, not my machine.

Answer 1

Try Page.User.Identity.Name . This should be what you're looking for. This property is derived from HttpContext and represents the logged in user security information for the current HTTP request.

If the result is null, then I would suspect that the IIS settings is not configured properly. Try the advice in the following links:

http://forums.asp.net/t/1689878.aspx/1
HttpContext.Current.User.Identity.Name is Empty

Answer 2

使用此System.Environment.GetEnvironmentVariable（“ UserName”）

Answer 3

Take a look at:

https://richhewlett.com/2011/02/15/getting-a-users-username-in-asp-net/

Here are the main examples from the link above:

Scenario 1: Anonymous Authentication in IIS with impersonation off.

HttpContext.Current.Request.LogonUserIdentity.Name  -> COMPUTER1\IUSR_COMPUTER1
HttpContext.Current.Request.IsAuthenticated -> False
HttpContext.Current.User.Identity.Name  -> –
System.Environment.UserName -> ASPNET
Security.Principal.WindowsIdentity.GetCurrent().Name    -> COMPUTER1\ASPNET

Scenario 2: Windows Authentication in IIS, impersonation off.

HttpContext.Current.Request.LogonUserIdentity.Name  -> MYDOMAIN\USER1
HttpContext.Current.Request.IsAuthenticated -> True
HttpContext.Current.User.Identity.Name  -> MYDOMAIN\USER1
System.Environment.UserName -> ASPNET
Security.Principal.WindowsIdentity.GetCurrent().Name    -> COMPUTER1\ASPNET

Scenario 3: Anonymous Authentication in IIS, impersonation on

HttpContext.Current.Request.LogonUserIdentity.Name  -> COMPUTER1\IUSR_COMPUTER1
HttpContext.Current.Request.IsAuthenticated -> False
HttpContext.Current.User.Identity.Name  -> –
System.Environment.UserName -> IUSR_COMPUTER1
Security.Principal.WindowsIdentity.GetCurrent().Name    -> COMPUTER1\IUSR_COMPUTER1

Scenario 4: Windows Authentication in IIS, impersonation on

HttpContext.Current.Request.LogonUserIdentity.Name  -> MYDOMAIN\USER1
HttpContext.Current.Request.IsAuthenticated -> True
HttpContext.Current.User.Identity.Name  -> MYDOMAIN\USER1
System.Environment.UserName -> USER1
Security.Principal.WindowsIdentity.GetCurrent().Name    -> MYDOMAIN\USER1

Note:

SERVER1\ASPNET: Identity of the running process on server.
SERVER1\IUSR_SERVER1: Anonymous guest user defined in IIS.
MYDOMAIN\USER1: The user of the remote client.