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I need to get the information about the user actually logged (as SPUser) inside an event receivers.

The following line:

Dim currentUser As SPUser = SPContext.Current.Web.CurrentUser

does not work because Current is set to Nothing (null).

I read around that this is due to the asynchronous nature of event receivers but then, how to get the user information I need?

EDIT: I am using ItemCheckingIn receiver to try block a user to check in a file checked out by another user.

Thank you in advance for any help

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SPContext will not be available in EventReceiver, hence your Current is returning null.. instead use Properties – Gaurravs Mar 28 at 8:51
up vote 3 down vote accepted

Use the synchronous method in your event receiver, and you should be able to retrieve the current user from the context.

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Thank you for the fast answer. I edited my question to give more details. I am not sure I can use a synchronous event receiver to implement this logic, or yes? – Drake Sep 7 '10 at 10:27
Synchronous is the only way to go if you want to stop an operation, as you are doing. Strange however, as CurrentContext should be available at this stage... – James Love Sep 7 '10 at 10:51
Have you also tried properties.CurrentUserId? – James Love Sep 7 '10 at 11:06
Yes, it worksm thank you! Do you also know how to get SPUser from a CurrentUserId? – Drake Sep 7 '10 at 12:19
No worries - SPWeb.Users.GetByID() I believe. – James Love Sep 7 '10 at 12:21

Use this:

public override void ItemCheckingIn(SPItemEventProperties properties)
    var currentUser = properties.Web.CurrentUser;

As you can see, properties object contain SPWeb, that have CurrentUser property.

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You can use this code.

using (SPSite originalsite = new SPSite(properties.SiteId, properties.OriginatingUserToken))
  //To get the current user
  using (SPWeb web = originalsite.OpenWeb())
    string strUserName = web.CurrentUser.LoginName.ToString();
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Not 100% sure what the behaviour is with async event receivers, but did you have a look at

WindowsIdentity windowsIdentity = WindowsIdentity.GetCurrent();
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This code return me an exception: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. – Drake Sep 7 '10 at 12:14
how to get the current logged in user in the itemadded eventreceiver event ? – SaMolPP Mar 15 at 6:51

With 2010, the event property bag contains the OriginatingUserToken ,UserDisplayName , and UserLoginName, which you can use to get the original user.

Check the section 5. Impersonation enhancements here :

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