CODEWITHSUNDEEP
c#androidxamarin.forms
Fourie
Fourie

Reputation: 55

Why does my app crash after alert dialog buttons are clicked

I have a DisplayPromptAsync it crashes my app when one of the two buttons is clicked.

It still does what it is suppose to do then crashes the app.

DisplayPromptAsync Function RejectButton_Clicked = new Command(get => RejectClick());

    public async void RejectClick()
    {
        try
        {
            rejectReason = await Application.Current.MainPage.DisplayPromptAsync("Reject Reason",
                "Are you sure you want to reject Order Number: " + selectedItem.OrderNumber
                + " and Company: " + selectedItem.Company, "OK", "Cancel");
            SendReject();
            GetData();
        }
        catch (Exception ex)
        {
            await Application.Current.MainPage.DisplayAlert("Error", ex.ToString(), "OK");
        }
    }

Send Reject function

    private async void SendReject()
    {
        try
        {
            string requestUrl = "https://mist.zp.co.za:6502/MIST.svc/REJ/M@H$@203@R/" + selectedItem.OrderNumber +
                "/" + selectedItem.Company + "/" + rejectReason;
            using (var client = new HttpClient())
            {
                HttpResponseMessage response = await client.GetAsync(requestUrl);
            }
        }
        catch (Exception ex)
        {
            await Application.Current.MainPage.DisplayAlert("Error", ex.ToString(), "OK");
        }
    }

Get Data function

    private async void GetData()
    {
        MistHeaders.Clear();
        string requestUrl = "https://mist.zp.co.za:6502/MIST.svc/head/M@H$@203@R";
        using (var client = new HttpClient())
        {
            HttpResponseMessage response = await client.GetAsync(requestUrl);
            try
            {
                if (response.StatusCode == System.Net.HttpStatusCode.OK)
                {
                    string content = await response.Content.ReadAsStringAsync();
                    MistHeaders root = JsonConvert.DeserializeObject<MistHeaders>(content);
                    List<Models.Table> dates = root.Table;

                    foreach (var item in dates)
                    {
                        MistHeaders.Add(item);
                    }
                }
            }
            catch (Exception ex)
            {
                await Application.Current.MainPage.DisplayAlert("Error", ex.ToString(), "OK");
            }
        }
    }

I've added the other two functions for relevance.

Something I forgot it works perfectly fine on emulator just not on physical device

Upvotes: 0

Views: 534

Answers (1)

ColeX
ColeX

Reputation: 14475

The crash is caused by button click , but this code is not exposed by xamarin , so try catch is not helpful .

Try to call DisplayPromptAsync function on Main thread.

Device.BeginInvokeOnMainThread(async () =>
{
      rejectReason = await Application.Current.MainPage.DisplayPromptAsync("Reject Reason",
                "Are you sure you want to reject Order Number: " + selectedItem.OrderNumber
                + " and Company: " + selectedItem.Company, "OK", "Cancel");    
});

Upvotes: 3

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