C#•7mo ago

Difference between await & GetAwaiter()/GetResult()

I'm actually doing a simple task that checks if a role exists in the database and create it if the role doesn't exists. Code:

if (!_roleManager.RoleExistsAsync(SD.Role_Customer).GetAwaiter().GetResult())
  {
    _roleManager.CreateAsync(new IdentityRole(SD.Role_User)).GetAwaiter().GetResult();
    _roleManager.CreateAsync(new IdentityRole(SD.Role_Moderator)).GetAwaiter().GetResult();
    _roleManager.CreateAsync(new IdentityRole(SD.Role_Admin)).GetAwaiter().GetResult();
    _roleManager.CreateAsync(new IdentityRole(SD.Role_Invited)).GetAwaiter().GetResult();
  }

if (!_roleManager.RoleExistsAsync(SD.Role_Customer).GetAwaiter().GetResult())
  {
    _roleManager.CreateAsync(new IdentityRole(SD.Role_User)).GetAwaiter().GetResult();
    _roleManager.CreateAsync(new IdentityRole(SD.Role_Moderator)).GetAwaiter().GetResult();
    _roleManager.CreateAsync(new IdentityRole(SD.Role_Admin)).GetAwaiter().GetResult();
    _roleManager.CreateAsync(new IdentityRole(SD.Role_Invited)).GetAwaiter().GetResult();
  }

Here's how it looks like with await:

if (!await _roleManager.RoleExistsAsync(SD.Role_Customer).GetAwaiter().GetResult())
  {
    await _roleManager.CreateAsync(new IdentityRole(SD.Role_User));
    await _roleManager.CreateAsync(new IdentityRole(SD.Role_Moderator));
    await _roleManager.CreateAsync(new IdentityRole(SD.Role_Admin));
    await _roleManager.CreateAsync(new IdentityRole(SD.Role_Invited));
  }

if (!await _roleManager.RoleExistsAsync(SD.Role_Customer).GetAwaiter().GetResult())
  {
    await _roleManager.CreateAsync(new IdentityRole(SD.Role_User));
    await _roleManager.CreateAsync(new IdentityRole(SD.Role_Moderator));
    await _roleManager.CreateAsync(new IdentityRole(SD.Role_Admin));
    await _roleManager.CreateAsync(new IdentityRole(SD.Role_Invited));
  }

6 Replies

Angius•7mo ago

.GetAwaiter().GetResult() is blocking The one and only proper way to call asynchronous code is with await No maybes, no perhapses

jcotton42•7mo ago

$deadlock

MODiX•7mo ago

https://blog.stephencleary.com/2012/07/dont-block-on-async-code.html

Don't Block on Async Code

This is a problem that is brought up repeatedly on the forums and Stack Overflow. I think it’s the most-asked question by async newcomers once they’ve learned the basics.

jcotton42•7mo ago

Also see $nothread

MODiX•7mo ago

https://blog.stephencleary.com/2013/11/there-is-no-thread.html

There Is No Thread

This is an essential truth of async in its purest form: There is no thread.

Aokiri 🐸•7mo ago

Thanks a lot. I'll read about it and then modify the code.

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Programming

Difference between await & GetAwaiter()/GetResult()