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asp.net-identity

Why it actually calls FindByEmailAsync() when the code calls FindByEmail()

I am working with one legacy .NET MVC project left by my colleague, he uses Microsoft Identity System to deal with user authentication. In the LoginController:

var user = userManager.FindByEmail(modelUserName);
if(user == null)
{
  // the user was not found..
}
else
{}

Later I realized that FindByEmail() is actually a precompiled function written by Microsoft in the UserManagerExtension class. However, my colleague also defines another similar function called FindByEmailAsync() in his customized UserManager class:

public Task<User> FindByEmailAsync(string email)
{
  return ..
}

and when I debug the project, I found the code in LoginController somehow called FindByEmailAsync() when it run "var user = userManager.FindByEmail(modelUserName)", why is that?

Solution

  • As you said, FindByEmail is an extension method. Only this is a thin wrapper that just calls FindByEmailAsync in a sync manner - easy to inspect the original source code - search for "FindByEmail" on the page.

    So there is no surprise you see async method called when you actually call sync version in your code.