Calling async method from another class

Question

I have a async method in my main form which populates the grid from data retrieve from a website.

I created another class and called that function, when I debug I can see the flow entering the function, reading data from website and populating the grid but in Reality grid remains empty.

Code example is this.. Please help !

Class MainForm
{

 public async PopulateGrid()

    //goto website
    //get data
    //updategrid

 }

 Class newProject
 {

    MainForm mf = new Mainform;
    mf.PopulateGrid();

 }

Where is the code that updates the grid? There is absolutely no difference between calling an async member method vs another class's async method. Moreover, where do you show the form (ie call mf.Show()? ) — Panagiotis Kanavos
– Panagiotis Kanavos, Commented Sep 30, 2013 at 6:46

Toni Petrina · Accepted Answer · 2013-09-30 06:58:20Z

1

First, a word of advice: never write async void methods that aren't event handlers. You hide exceptions by using async void methods. Also, always add the Async suffix to the asynchronous methods. Here is a proposed new definition:

public async Task PopulateGridAsync() {...}

You should also await all async calls, so ensure that you write:

await mf.PopulateGridAsync();

Most likely you got some exception, but it was hidden due to the void return type.

More info:

Tip 1: Async void is for top-level event-handlers only

answered Sep 30, 2013 at 6:58

Toni Petrina

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Comments

Panagiotis Kanavos · Accepted Answer · 2013-09-30 06:49:56Z

0

We have to guess here. You should provide the full method signature and the code that actually updates the grid. Additionally, when and how do you show the form?

One guess is that your code displays the grid using data from a structure hasn't been filled yet by PopulateGrid. PopulateGrid should force an update of the grid itself after it receives the data, otherwise the grid will never know there are new data.

answered Sep 30, 2013 at 6:49

Panagiotis Kanavos

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