async-await in asp.net core web api (not MVC)

I have this http post controller method to insert a new text message to db. Here I want to change this method to async method. I tried but still couldn’t do it. Can anyone help me? 🙂

This is my controller method

[HttpPost]
    public ActionResult<Message> Create(Message message)
    {
        var duplicatemessage = _messageService.DuplicateMessage(message.Text);
        if (duplicatemessage == null)
        {
            _messageService.Create(message);
            return CreatedAtRoute("Api", new { id = message.Id.ToString() }, message);
        }
        else
        {
            return BadRequest(new { message = "Text Already Exist" });
        }
    }

These are my service class methods related to the controller post method

public Message DuplicateMessage(string Text)
    {
        return _messages.Find<Message>(message => message.Text == Text).FirstOrDefault();
    }

    public Message Create(Message message)
    {
        _messages.InsertOne(message);
        return message;
    }

Answers:

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Method 1

try this:

    public async Task<ActionResult<Message>> Create(Message message)
    {
        var duplicatemessage =  await _messageService.DuplicateMessage(message.Text);
        if (duplicatemessage == null)
        {
            _messageService.Create(message);
            return CreatedAtRoute("Api", new { id = message.Id.ToString() }, message);
        }
        else
        {
            return BadRequest(new { message = "Text Already Exist" });
        }
    }


public async Task<Message> DuplicateMessage(string Text)
    {
        return await _messages.Set<Message>().Where(message => message.Text == 
 Text).FirstOrDefaultAsync();
    }

Method 2

If you want to implement the async method into your controller (i assume this is what you want). You must first make the function, DuplicateMessage or async. You can do that by making the return type a task and running it in a task.

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