ASP.NET async action return types-CodePudding

I have an ASP.NET MVC project with some controller, views and actions and so on.

I have heard that I should be able to make my controller actions async without any problems, but I'm really struggling with how to return views in that case.

I have this action called UpdateUser() which is async, and has some functions that I want to have the await keyword (more are to be added). After doing these operations, I need to return to a view, like in most controller action:

public async Task Updateuser()
{
    ApplicationUser usr =  await _userManager.FindByNameAsync(User.Identity.Name);

    string  name = usr.UserName;
    string email = usr.Email;
    string UserEmail = name   email;
    string hash = "";

    using (var sha = new System.Security.Cryptography.SHA256Managed())
    {
        // Convert the string to a byte array first, to be processed
        byte[] textBytes = System.Text.Encoding.UTF8.GetBytes(UserEmail);
        byte[] hashBytes = sha.ComputeHash(textBytes);

        // Convert back to a string, removing the '-' that BitConverter adds
        hash = BitConverter
            .ToString(hashBytes)
            .Replace("-", String.Empty).ToLower();
    }

    return View();
}

So at the line where it says return View(); my IDE is angry about the return type, because the return type needs to be a `Task.

So how do I return my view, using async methods?

CodePudding user response：

You should use IActionResult to return the view from MVC controller's action. Your method should like the following with the async task:

public async Task<IActionResult> Updateuser()
{    
    return View();
}