'Microsoft.Owin.IOwinContext' does not contain a definition for 'GetUserManager' and no extension method?
asp.net, asp.net-identity, asp.net-identity-2, asp.net-mvc-5
Solution
The extension method was moved to a different namespace, try adding
using Microsoft.AspNet.Identity.Owin;
Problem
The following code is copied from the Asp.Net Identity 2.0 sample. ``` private ApplicationUserManager _userManager; public ApplicationUserManager UserManager { get { return // Error _userManager ?? HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>(); } private set { _userManager = value; } } ``` However it gets the following error? Error 3 'Microsoft.Owin.IOwinContext' does not contain a definition for 'GetUserManager' and no extension method 'GetUserManager' accepting a first argument of type 'Microsoft.Owin.IOwinContext' could be found (are you missing a using directive or an assembly reference?) Update: The version 2 of Microsoft.AspNet.Identity.Owin.dll already exists in ...\packages\Microsoft.AspNet.Identity.Owin.2.0.1\lib\net45. However, the view definition of `HttpContext.GetOwinContext()` are different between my project and the sample. The first three lines of my project are ``` #region Assembly Microsoft.Owin.Host.SystemWeb.dll, v2.0.0.0 // C:\......\packages\Microsoft.Owin.Host.SystemWeb.2.0.0\lib\net45\Microsoft.Owin.Host.SystemWeb.dll #endregion ``` while the sample is ``` #region Assembly Microsoft.Owin.Host.SystemWeb.dll, v2.1.0.0 // C:\....\sample\packages\Microsoft.Owin.Host.SystemWeb.2.1.0\lib\net45\Microsoft.Owin.Host.SystemWeb.dll #endregion ``` But I already updated all Owin Nuget packages to the newest version using Neget.