Acessing change of variable of an internal project in MVC [C#]

Question

I have an internal project (separated folder) in my MVC App. It contains classes of one of my projects. Then I have one controller for this project and method that initializes it looks like this :

[HttpPost]
    public ActionResult initiate() {
               // System.Diagnostics.Debug.WriteLine("Initiated");
                Network net = new Network(normalizeInput);
                net.train();
               // System.Diagnostics.Debug.WriteLine("average error :" + net.averageError);
                double err = net.averageError;
                ViewBag.err = err.ToString();
                return View("initiate");
        }

and its view :

@{
    ViewBag.Title = "initiate";
}

<h3>Everything is prepared</h3>
<!--<button type="button" onclick="location.href='@Url.Action("initiate", "BackpropController")'"/> -->
@using (Html.BeginForm("initiate", "Backprop", FormMethod.Post)) {
    @Html.AntiForgeryToken()
    <input type="submit" value="Initiate" />
}
<br>
<br>
    @{ string averageError = ViewBag.err;
        if (averageError != null) {
        <h4>@averageError</h4>  } 
        else { <h4>no error</h4>}
        }

The question is : How can I show in the view updated value by each iteration? Because that variable is final one, but method train() contains loop where average error is like this :
averageError += Math.Abs(testingSet[j].desiredOutput - neuron.getOutput());

It interests me because I would like to make graph of error as it would be function of iteration.. simply said :

f(error,iteration)

The graph should be placed in the view I posted and should be updated every iteration situated in method train()

Thanks for the answers.

Yes I am. The problem is that when I create the instance in controller method and call train() method then Im only able to pass final value... — wesker, Nov 06 '16 at 12:28

score 0 · Answer 1 · edited May 23 '17 at 12:16

0

I am not sure if i understand your question correctly.

If you want to pass iteration on your view, you have to either:

pass the train() method return value (if any) to view or
create View model you want to iterate from train() and pass it to view (preferable)

https://stackoverflow.com/a/18608533/5929494

edited May 23 '17 at 12:16

Community

1
1

answered Nov 06 '16 at 11:42

RizkiDPrast

1,695
1
14
21

Thanks for the answer. Its like I want to have a label in view and there should be value (for example number of iteration or value of error) changing every each iteration in method train() I cant pass final value, however the value is adjusting every iteration and I want to make it viewable.. and I need it to make a plot later as I reminded. – wesker Nov 06 '16 at 11:54

score 0 · Answer 2 · answered Nov 07 '16 at 01:58

You need to return the averageError values from your Network class train method to your controller. For example, you could do this with a property in the Network class such as...

class Network {
    //your other code

    public IEnumerable<double> averageErrors {get; set;}

    public void train() {
        averageErrors = new List<double>();

        for (//your loop) {
            averageError += Math.Abs(testingSet[j].desiredOutput - neuron.getOutput());
            averageErrors.Add(averageError);
        }
    }
}

Then in your controller...

[HttpPost]
public ActionResult initiate() {
           // System.Diagnostics.Debug.WriteLine("Initiated");
            Network net = new Network(normalizeInput);
            net.train();
           // System.Diagnostics.Debug.WriteLine("average error :" + net.averageError);
            double err = net.averageError;

            // you now have a list of averageErrors in your controller to use as you please
            List<double> allErrors = net.averageErrors;

            ViewBag.err = err.ToString();
            return View("initiate");
    }

This gives you access to all the average errors after the train method has completed, so you can report this in the view however you like.

If train is a long-running method and you want to show a real-time update of average errors as the method is running, then things will get a bit more complicated. The general approach I would use would be to make the train method asynchronous, but not await it's execution before returning a view. The view will have placeholders, and use some form of client-side code to listen for updates e.g. SignalR. The train method would then periodically send updates to the client, and then finally send the completed data.

Acessing change of variable of an internal project in MVC [C#]

2 Answers2