public void RemoveUser(User user)
{
if (user == null)
{
var paramName = nameof(user);
throw new ArgumentNullException(paramName);
}
}
private static void NullConditionalOperator()
{
var user = new User
{
Parent = CreateDefaultUser()
};
WriteLine(user.Parent?.Name[0]);
WriteLine(user.Parent?.Parent?.Name);
var viewModel = new UserListViewModel();
viewModel.AddUser(user);
}
public User SaveUser(User user, bool retry = true)
{
try
{
return SaveUserInternal(user, retry);
}
catch (RetryableException ex) when (ex.Retryable)
{
return SaveUser(user, false);
}
catch (RetryableException ex)
{
throw new ApplicationException();
}
}
public async Task<User> SaveUserAsync(User user, bool retry = true)
{
try
{
var startNew = Task.Factory.StartNew(() => SaveUserInternal(user, retry));
return await startNew;
}
catch (RetryableException ex) when (ex.Retryable)
{
return await SaveUserAsync(user, false);
}
catch (Exception ex)
{
throw new ApplicationException();
}
}
private User SaveUserInternal(User user, bool retryable = true)
{
throw new RetryableException("Failed to save user", retryable);
return new User();
}
public void AddUser(User user)
{
userList.Add(user);
UserAdded?.Invoke(this, user);
}