如何使用c＃asp.net MVC每10秒调用一次方法？

Question

Im stuck trying to call a method every 10 seconds, I read about timers and threads but the problem is that i do not know where to put the method to be fired, MVC projects have a Main?

    private async Task ActualizarPrecios()
      {
        Entities model = new Entities();
        var transaciones = model.Transacciones.Where(a => a.ESTADO == 
         true).ToList();
        string Url = ObtenerUrl(model);

        ApiForex.IniciarCliente();

        ProcesarRequest procesar = new ProcesarRequest();
        JObject divisas = await procesar.CargarJson(Url);

        foreach(Transacciones item in transaciones)
        {
          item.PRECIO_ACTUAL = (string)divisas["rates"][item.DIVISA] 
        ["rate"];
        }
        model.SaveChanges();
     }

The code that is to upload some columns of tables in the database. I dont know how to fire this method every x seconds

Answer 1

You might want to investigate scheduling APIs and third party tools. Hangfire ( https://www.hangfire.io/ ) is one that I have used successfully

Answer 2

I would use JavaScript to achieve this.

At the bottom of your View file (*.cshtml) add this code:

<script type="text/javascript">
 var interval = 10000; 
 setInterval(function() { Update() }, interval);

 function Update(){
     $.get("/[ControllerName]/ActualizarPrecios", function(){
         alert( "Load was performed.")}
     );
 } 
</script>

Explanation:

<script type="text/javascript">

This is HTML denodes you are writing scripts in the JavaScript language

var interval = 10000; setInterval(function() { Update() }, interval);

Sets the interval to 10 seconds (in milliseconds)

Then uses the JavaScript function for repeating executions on an interval see more on W3 Schools

function Update(){
     $.get("/[ControllerName]/ActualizarPrecios", function(){
         alert( "Load was performed.")}
     );
 } 

This function uses Ajax in jQuery to call an API. Which exists in your controller. You haven't shared your controller name so replace the code accordingly, the method looks like a get method to me however it is post then change $.get to $.post . The function after the url path is executed on callback to your request. For now, to make it clear during testing it is running the line alert( "Load was performed.") which will pop up a dialog box in your browser; if you want to write something out to the html after running the request you can do that here.

*Note jQuery is included out the box in MVC C# projects. In your \\shared\\_Layout.cshtml file you'll see it reference in a section at the bottom of the page.

Answer 3

1) If your application is going to host on Server or virtual machine (VM) then you can create window service and register service on the same.

Url : https://www.aspsnippets.com/Articles/Simple-Windows-Service-that-runs-periodically-and-once-a-day-at-specific-time-using-C-and-VBNet.aspx

2) If your application is going to host on Azure pass then you can use Azure web jobs for the same. Url : https://docs.microsoft.com/en-us/azure/app-service/webjobs-create