Task does not contain a definition for 'FirstOrDefault'

Question

Error CS1061 \'Task>\' does not contain a definition for \'FirstOrDefault\' and no extension method \'FirstOrDefault\' accepting a first argument of type

Answer 1

Look closely at the error message. GetClaimsAsync returns type Task<IList<Claim>>, not type list. The Task type doesn't have a FirstOrDefault method. As other people have indicated, await GetClaimsAsync and it'll work.

As a side note, do not use .Result here as that will deadlock in most environments. See this article for an explanation of why this will deadlock as well as this article on async/await best practices.

Answer 2

You are missing an await in front of UserManager.GetClaimsAsync():

var currentClaims = await UserManager.GetClaimsAsync(...);