Good evening everyone
I'm trying to pass two objects at the same screen over the error to pass the second. I would like to know how to treat this receipt on my main screen.
I will try to give an example below:
first send an object parameter for the screen client
private void btTelaPedido (object sender, TappedRoutedEventArgs e) {
Customer customer = new Customer ();
customer.custid = Convert.ToInt32 (tbCodCliente.Text);
cliente.razao = tbNomeCliente.Text;
Frame.Navigate (typeof (pedidoTelaCadastro), client);
}
then go to another screen and send another object
private void listaProduto_SelectionChanged (object sender, SelectionChangedEventArgs e) {
Product produtoEscolhido = (sender the ListView) .SelectedItem the product;
Frame.Navigate (typeof (pedidoTelaCadastro), produtoEscolhido);
}
and that is, to receive code on the main screen.
protected override void OnNavigatedTo (NavigationEventArgs e) {
this.navigationHelper.OnNavigatedTo (e);
ClienteRecebido customer = (customer) e.Parameter;
tbIdCliente.Text = Convert.ToString (clienteRecebido.idCliente);
tbCliente.Text = clienteRecebido.razao;
tbDataPedido.Text = "01/01/2015";
ProdutoRecebido product = (Product) e.Parameter;
tbProduto.Text = Convert.ToString (produtoRecebido.descricao);
}
I wonder how he treats
protected override void OnNavigatedTo(NavigationEventArgs e)
{
this.navigationHelper.OnNavigatedTo(e);
Customer clienteRecebido = e.Parameter as Customer;
if(clienteRecebido !=null)
{
tbIdCliente.Text = Convert.ToString (clienteRecebido.idCliente);
tbCliente.Text = clienteRecebido.razao;
tbDataPedido.Text = "01/01/2015";
}
else
{
ProdutoRecebido product = (Product) e.Parameter;
tbProduto.Text = Convert.ToString (produtoRecebido.descricao);
}
}
Related
I have parsed the feed http://www.toucheradio.com/toneradio/android/toriLite/AndroidRSS.xml
And all items from rss feed displayed in listbox.Now I dont want to get first item I have to omit it.How Can I do it.
MainPage.xaml.cs:
namespace tori
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();
// is there network connection available
if (!System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
{
MessageBox.Show("No network connection available!");
return;
}
// start loading XML-data
WebClient downloader = new WebClient();
Uri uri = new Uri(" http://www.toucheradio.com/toneradio/android/toriLite/AndroidRSS.xml", UriKind.Absolute);
downloader.DownloadStringCompleted += new DownloadStringCompletedEventHandler(ChannelDownloaded);
downloader.DownloadStringAsync(uri);
}
void ChannelDownloaded(object sender, DownloadStringCompletedEventArgs e)
{
if (e.Result == null || e.Error != null)
{
MessageBox.Show("There was an error downloading the XML-file!");
}
else
{
// Deserialize if download succeeds
XDocument document = XDocument.Parse(e.Result);
var queue = from item in document.Descendants("item")
select new Item
{
title = item.Element("title").Value
,
link = item.Element("link").Value
,
ThumbnailUrl = item.Element(item.GetNamespaceOfPrefix("media") + "thumbnail").Attribute("url").Value
,
};
itemsList.ItemsSource = queue;
}
}
public class Item
{
public string title { get; set; }
public string ThumbnailUrl { get; set; }
public string link { get; set; }
}
If I write queue.RemoveAt(0);
i was getting error at RemoveAt.
Can anybody please tell me how can I do that.
Many Thanks in advance.
You can easily do this using LINQ Skip extension method (documentation here).
Just try the sample below:
itemsList.ItemsSource = queue.Skip(1);
As well you can rewrite the query to omit the first item before applying the projection in the select method using the methods chain approach:
var queue = document.Descendants("item")
.Skip(1)
.Select(item => new Item
{
title = item.Element("title").Value,
link = item.Element("link").Value,
ThumbnailUrl = item.Element(item.GetNamespaceOfPrefix("media") + "thumbnail").Attribute("url").Value,
})
.ToList();
itemsList.ItemsSource = queue;
UPDATE / DUE TO COMMENTS
And as well if you need to skip items at certain indexes you may use the Where method and the HasSet as in the sample below:
var document = XDocument.Parse(e.Result);
var indexes = new HashSet<int> { 1, 3, 4 };
var queue = document.Descendants("item")
.Select(item => new Item
{
title = item.Element("title").Value,
link = item.Element("link").Value,
ThumbnailUrl =
item.Element(item.GetNamespaceOfPrefix("media") + "thumbnail").Attribute("url").Value,
})
.Where((x, i) => !indexes.Contains(i))
.ToList();
Items.ItemsSource = queue;
I have a problem that I can't really figure out, and I am really desperate now - I've no idea why it's happening:(
So here is the problem: I am writing a kind of Guess that Tune app. The first page is a menu page, that a user can press "Play" button, and he will navigate to a GenreSelectPage where he selects a genre and navigates to a GamePage. I wanted to handle BackButtonPress on GamePage - when a user hits BackButton, he navigates to MainPage, not GenreSelectPage. Here is the code:
private void PhoneApplicationPage_BackKeyPress(object sender, CancelEventArgs e)
{
base.OnBackKeyPress(e);
this.player.Pause();
var result = MessageBox.Show(AppResources.GamePageAlert, "Warning", MessageBoxButton.OKCancel);
if (result == MessageBoxResult.OK)
{
//NavigationService.RemoveBackEntry();
//App.RootFrame.Navigate(new Uri(#"/MainPage.xaml", UriKind.Relative));
}
else
{
this.player.Play();
e.Cancel = true;
}
}
However, I encoountered a big problem here I can't really solve. When I move back to MainMEnu, than go again to GenreSelectPage and choose the same genre, everything is ok - the app navigates to GamePage where there is list of 4 answers. However, if I choose another genre, the listBox at GamePage is populated with 12 or 15 items. On the other hand, when I comment navigation to MainPage and normally go back, everything works alright.
Here is my GenrePage Code:
public GenresPage()
{
InitializeComponent();
this.DataContext = App.ViewModel.GenreHelper;
}
private async void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
{
this.genresListBox.SelectedIndex = -1;
this.progressBar.Visibility = System.Windows.Visibility.Visible;
this.genresListBox.ItemsSource = await App.ViewModel.GenreHelper.GetGenres();
this.progressBar.Visibility = System.Windows.Visibility.Collapsed;
ClearCollections();
}
private static void ClearCollections()
{
if (App.ViewModel.TracksCollection.Count != 0)
{
App.ViewModel.TracksCollection.Clear();
App.ViewModel.TrackCounter = 0;
}
if (App.ViewModel.AnswerCollection.Count > 0)
{
App.ViewModel.AnswerCollection.Clear();
}
}
private async void NavigateToPlay(object sender, RoutedEventArgs e)
{
if (this.genresListBox.SelectedIndex != -1)
{
this.progressBar.Visibility = System.Windows.Visibility.Visible;
await App.ViewModel.GetSongs();
await App.ViewModel.GetAnswers();
this.progressBar.Visibility = System.Windows.Visibility.Collapsed;
NavigationService.Navigate(new Uri(#"/Views/GamePage.xaml", UriKind.Relative));
}
}
UPDATE
On my GamePage I am only assigning DataContext and duration to MediaElement:
public partial class GamePage : PhoneApplicationPage
{
public GamePage()
{
InitializeComponent();
this.DataContext = App.ViewModel;
}
private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
{
var trackId = App.ViewModel.TracksCollection[App.ViewModel.TrackCounter].Id;
var sampleUri = App.ViewModel.GetSampleUri(trackId);
player.Source = new Uri(sampleUri.AbsoluteUri);
player.Play();
}
private void GetTrackDuration(object sender, RoutedEventArgs e)
{
var player = (MediaElement)sender;
if (player.CurrentState == System.Windows.Media.MediaElementState.Playing)
{
playerSeekBar.Maximum = player.NaturalDuration.TimeSpan.TotalSeconds;
}
}
private void PhoneApplicationPage_BackKeyPress(object sender, CancelEventArgs e)
{
base.OnBackKeyPress(e);
this.player.Pause();
var result = MessageBox.Show(AppResources.GamePageAlert, "Warning", MessageBoxButton.OKCancel);
if (result == MessageBoxResult.OK)
{
//NavigationService.RemoveBackEntry();
//App.RootFrame.Navigate(new Uri(#"/MainPage.xaml", UriKind.Relative));
}
else
{
this.player.Play();
e.Cancel = true;
}
}
}
If anyone can point out what I am doing wrong, I would be really greatful - I am fighting it all day and I have no idea what's causing it.
Thank You very much in advance!!
I'm new to WP7 app development and I'm having trouble passing parameters to an API on a website.
It's my understanding that the onNavigatedTo() is fired first when a page is open on the WP7, however when I try to grab the parameters the webClient_DownloadStringCompleted() is fired first.
public partial class Ranks : PhoneApplicationPage
{
private WebClient webClient;
private string pageType;
private string pagePosition;
public Ranks()
{
InitializeComponent();
this.webClient = new WebClient();
string header_auth = "application/json";
this.webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted);
this.webClient.Headers[HttpRequestHeader.Authorization] = header_auth;
Uri serviceUri = new Uri(#"http://www.example.com/api/API.php?type=" + pageType + "&position=" + pagePosition);
this.webClient.DownloadStringAsync(serviceUri);
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
string type, position;
if (NavigationContext.QueryString.TryGetValue("type", out type))
{
pageType = type;
}
if (NavigationContext.QueryString.TryGetValue("pos", out position))
{
pagePosition = position;
}
}
void webClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
string myJsonString = e.Result;
List<PlayerDetails> dataSource = new List<PlayerDetails>();
//load into memory stream
using (var ms = new MemoryStream(Encoding.Unicode.GetBytes(myJsonString)))
{
//parse into jsonser
var ser = new DataContractJsonSerializer(typeof(PlayerDetails[]));
PlayerDetails[] obj = (PlayerDetails[])ser.ReadObject(ms);
foreach (PlayerDetails plyr in obj)
{
dataSource.Add(plyr);
}
playerList.ItemsSource = dataSource;
}
}
Whenever the URI string is built it's missing the parameters 'pageType' and 'pagePosition'
Any help would be greatly appreciated!
The class constructor will always get called before OnNavigatedTo. you should move that code from the constructor, and into OnNavigatedTo (or Loaded).
I'm guessing that you have that code in the constructor because you only want it to happen once per page load (i.e. not when the user navigates Back onto the page). If that's the case, you can check the NavigationMode.
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
if (e.NavigationMode == NavigationMode.New)
{
string type, position;
if (NavigationContext.QueryString.TryGetValue("type", out type))
{
pageType = type;
}
if (NavigationContext.QueryString.TryGetValue("pos", out position))
{
pagePosition = position;
}
this.webClient = new WebClient();
string header_auth = "application/json";
this.webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted);
this.webClient.Headers[HttpRequestHeader.Authorization] = header_auth;
Uri serviceUri = new Uri(#"http://www.example.com/api/API.php?type=" + pageType + "&position=" + pagePosition);
this.webClient.DownloadStringAsync(serviceUri);
}
}
I'm developing app which connects to service and consume some JSON data. Consuming works great (JSON.net rocks) but I wonder where I should catch exception error annd show simple MessageBox? Tried in few places but still my app is closing. Or maybe I should do it based on json response which contain error tag? I think that normal error handling could be easier, but have blank spot in my mind now..
Code is below:
private void LoginLoginButton_Click(object sender, System.EventArgs e)
{
((ApplicationBarIconButton)ApplicationBar.Buttons[0]).IsEnabled = false;
ProgressOverlay.Show();
GenerateLoginString();
var w = new SharpGIS.GZipWebClient();
Observable.FromEvent<DownloadStringCompletedEventArgs>(w, "DownloadStringCompleted")
.Subscribe(r =>
{
var settings = IsolatedStorageSettings.ApplicationSettings;
var deserializedRootObject = JsonConvert.DeserializeObject<RootObject>(r.EventArgs.Result);
UserSettings us = new UserSettings()
{
first_name = deserializedRootObject.user.first_name,
last_name = deserializedRootObject.user.last_name,
user_id = deserializedRootObject.user_id,
};
settings.Add("UserSettings", us);
settings.Save();
});
w.DownloadStringAsync(new Uri(UserUri));
w.DownloadStringCompleted += new DownloadStringCompletedEventHandler(w_DownloadStringCompleted);
}
void w_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
}
If you mean you want to catch an exception which occurs in your web client call then it should be in the Error property of DownloadStringCompletedEventArgs.
void w_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
if(e.Error != null)
{
MessageBox.Show("An error occurred!");
}
else
{
NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
}
}
Solved!
I used try and catch in this case. Works perfect :)
I am doing small Silverlight app which will allow users to Create orders. I have created Linq 2 SQL dbml and dragged there my database tables, "Orders" and "OrderLines" , there is an association between them. Order.ID ~ OrderLine.OrderID, so then i created DomainService for my tables, where i enabled client access, it generated for me the methods, Insert,Update,Delete,Get, for Orders and OrderLines, now i am creating New Order from my silverlight application, the usercontrol looks like this:
public partial class NewOrderView : UserControl
{
public ObservableCollection<OrderLine> OrderLines { get; set; }
public NewOrderView()
{
InitializeComponent();
OrderLines = new ObservableCollection<OrderLine>();
dataGrid.ItemsSource = OrderLines;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
var order = new Order();
foreach (var orderLine in OrderLines)
{
order.OrderLines.Add(orderLine);
}
order.CompanyId = int.Parse(StaticContainer.CurrentUser.CompanyId.ToString());
order.CreationDate = DateTime.Now;
order.Status = "შეკვეთილი";
order.Id = 1;
var ctx = new EntreeDomainContext();
ctx.Orders.Add(order);
ctx.SubmitChanges();
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
StaticContainer.Navigation.Back();
}
private void Button_Click_2(object sender, RoutedEventArgs e)
{
StaticContainer.Navigation.LogOut();
}
private void AddProduct(object sender, ProductAdditionEventHandlerArgs args)
{
var result = OrderLines.Where(x => x.Item.itmKEY == args.Product.itmKEY).FirstOrDefault();
if(result==null)
OrderLines.Add(new OrderLine(){Item = args.Product});
}
}
and Domain Service Method:
public void InsertOrder(Order order)
{
Context.Orders.InsertOnSubmit(order);
Context.SubmitChanges();
}
i have put here break point, and the thread comes here , and everything dones ok. but after that in the database no order and no orderline exist. and output writes : "A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.Linq.dll"
what can i do?
please help, and thank you.
Are you creating OrderLines from scratch? If so, you need to make sure that if they're new, that you're calling Context.OrderLines.InsertOnSubmit(orderLine) for each OrderLine you're adding, or you'll get problems like this. Also, you should provide all exception details here...