Key Down events in wp7

<TextBox Name="hrTextBox" MaxLength="1" Text="0"  KeyDown="hrTextBox_KeyDown" TextAlignment="Center" InputScope="Number"/>


Add this in your construcor to allow only numbers in text box


            InputScope scope = new InputScope();
            InputScopeName name = new InputScopeName();

            name.NameValue = InputScopeNameValue.Number;
            scope.Names.Add(name);

         

            minTextBox.InputScope = scope;

 private void hrTextBox_KeyDown(object sender, KeyEventArgs e)
        {
            switch (e.Key)
            {
                case Key.D0:
                case Key.D1:
                case Key.D2:
                case Key.D3:
                case Key.D4:
                case Key.Back:
                case Key.Delete:
                    break;
                default: e.Handled = true;
                    return;
            }
        }


     
        private void minTextBox_KeyDown(object sender, KeyEventArgs e)
        {
            if (minTextBox.Text != "")
            {
                if (int.Parse(minTextBox.Text) >= 6)
                {
                    switch (e.Key)
                    {
                        case Key.Back:
                        case Key.Delete:
                            break;
                        default: e.Handled = true;
                            return;
                    }
                }
            }

Play shoutcast stream in Windows phone 7

Here are the steps to play shoutcast stream in wp7.

1) Download the open source project from here
2) extract the file and check the folders in the project
you will find "Bin" and "src" folders. open "src" folder
3) Now you will find following packages:-
Shoutcast.Sample
Shoutcast.Sample.Phone
Shoutcast.Sample.Phone.Background
Shoutcast.Sample.Phone.Background.PlaybackAgent
Silverlight.Media.ShoutCast
4) Add Shoutcast.Sample.Phone.Background.PlaybackAgent, and
Silverlight.Media.ShoutCast in to your project
5) Now go to your main project(UI project) right click on Referencts and select add Reference
6) Select "Solution" in right pannel there you will find projects (Shoutcast.Sample.Phone.Background.Playback
Silverlight.Media.ShoutCast.Phone)
7) Check the box Shoutcast.Sample.Phone.Background.Playback project and click "Ok"
(Note:- if you dont want to play background audio than you can add only Silverlight.Media.ShoutCast.Phone to your project)
8) Now go to Properties folder on top of the References go to WMAppManifest.xml right click on that and open with "xml(Text) editor"(this is for vs 2012)
9) add the following lines below </Capabilities>
    <Tasks>
      <DefaultTask Name="_default" NavigationPage="YourMainPage.xaml" />
      <ExtendedTask Name="BackgroundTask">
        <BackgroundServiceAgent Specifier="AudioPlayerAgent" Name="Shoutcast.Sample.Phone.Background.PlaybackAgent" Source="Shoutcast.Sample.Phone.Background.PlaybackAgent" Type="Shoutcast.Sample.Phone.Background.Playback.AudioPlayer" />
        <BackgroundServiceAgent Specifier="AudioStreamingAgent" Name="Shoutcast.Sample.Phone.Background.StreamAgent" Source="Shoutcast.Sample.Phone.Background.PlaybackAgent" Type="Shoutcast.Sample.Phone.Background.Playback.AudioTrackStreamer" />
      </ExtendedTask>
    </Tasks>
10) now rebuild your entire solution check to see if any errors in your build. if no errors found then your back ground audio should work


-Please comment for any quires. 

VisualTreeHelper in wp7

        /// <summary>
        /// Finds a Child of a given item in the visual tree.
        /// </summary>
        /// <param name="parent">A direct parent of the queried item.</param>
        /// <typeparam name="T">The type of the queried item.</typeparam>
        /// <param name="childName">x:Name or Name of child. </param>
        /// <returns>The first parent item that matches the submitted type parameter.
        /// If not matching item can be found,
        /// a null parent is being returned.</returns>
        public static T FindChild<T>(DependencyObject parent, string childName)
           where T : DependencyObject
        {
            // Confirm parent and childName are valid.
            if (parent == null) return null;

            T foundChild = null;

            int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
            for (int i = 0; i < childrenCount; i++)
            {
                var child = VisualTreeHelper.GetChild(parent, i);
                // If the child is not of the request child type child
                T childType = child as T;
                if (childType == null)
                {
                    // recursively drill down the tree
                    foundChild = FindChild<T>(child, childName);

                    // If the child is found, break so we do not overwrite the found child.
                    if (foundChild != null) break;
                }
                else if (!string.IsNullOrEmpty(childName))
                {
                    var frameworkElement = child as FrameworkElement;
                    // If the child's name is set for search
                    if (frameworkElement != null && frameworkElement.Name == childName)
                    {
                        // if the child's name is of the request name
                        foundChild = (T)child;
                        break;
                    }
                }
                else
                {
                    // child element found.
                    foundChild = (T)child;
                    break;
                }
            }
            return foundChild;
        }
     

Change Background Image on pressed ListBox

<Grid x:Name="LayoutRoot" Background="Transparent">
        <!--toolkit:TiltEffect.IsTiltEnabled="True"-->
        <ListBox x:Name="Channel_List" SelectionChanged="Listbox1_SelectionChanged" >
         
            <ListBox.ItemTemplate>
                <DataTemplate>
                 
                    <ListBoxItem >
                        <StackPanel Width="490" MouseLeave="StackPanel_MouseLeave"  MouseLeftButtonDown="StackPanel_MouseLeftButtonDown" MouseLeftButtonUp="StackPanel_MouseLeftButtonUp">
                            <StackPanel.Background>
                                <ImageBrush ImageSource="/Assets/Images/channel-bg-unsel.png"/>
                            </StackPanel.Background>
                            <Image Source="{Binding Image}" />
                            <TextBlock Text="{Binding StationName}" FontFamily="Segoe Print" />
                        </StackPanel>
                    </ListBoxItem>
                 
                </DataTemplate>
            </ListBox.ItemTemplate>
         
        </ListBox>

     
     
    </Grid>


/////handle click events in code behind..



private void StackPanel_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            var obj = (sender as StackPanel);
            ImageSource img = new BitmapImage(new Uri("/Assets/Images/channel-bg-sel.png", UriKind.Relative));
           ImageBrush ig = new ImageBrush();
           ig.ImageSource = img;
           obj.Background = ig;
            //obj.Background =
        }

        private void StackPanel_MouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            var obj = (sender as StackPanel);
            ImageSource img = new BitmapImage(new Uri("/Assets/Images/channel-bg-unsel.png", UriKind.Relative));
            ImageBrush ig = new ImageBrush();
            ig.ImageSource = img;
            obj.Background = ig;
        }

        private void StackPanel_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
        {
            var obj = (sender as StackPanel);
            ImageSource img = new BitmapImage(new Uri("/Assets/Images/channel-bg-unsel.png", UriKind.Relative));
            ImageBrush ig = new ImageBrush();
            ig.ImageSource = img;
            obj.Background = ig;
        }

selected

unselected

WP7 Identity of the caller.

unable to determine application identity of the caller. settings class

or


Exception while using IsolatedStorageSettings:
System.IO.IsolatedStorage.IsolatedStorageException: Unable to determine
application Identity of the caller.
 at System.IO.IsolatedStorage.IsolatedStorage.InitStore(IsolatedScope
scope,Type appEvidenceType)
 at System.IO.IsolatedStorage.IsolatedStorageFile.GetStore(IsolatedScope
scope,Type applicationEvidenceType)
 at System.Io.IsolatedStorage.IsolatedStorageSettings..ctor(boolean
useSiteSettings)
 at System.IO.IsolatedStorage.IsolatedStorageSettings.get_ApplicationSettings()
 at ManasutoApp.AppSettings..ctor() in

Try this code in your settings class.

if (!System.ComponentModel.DesignerProperties.IsInDesignTool)

                {

                    settings = IsolatedStorageSettings.ApplicationSettings;

                }


"check if the code is running in (visual studio or blend) using DesignerProperties.IsInDesignTool since accessing IsolatedStorageSettings in Visual Studio or Expression Blend is invalid."

I found this from StackOverFlow ..





Specified argument was out of the range of valid values. wp7.

for this you need to lode the settings class in Loded event.
public partial class Page2 : UserControl
public Page2(){
  Loaded += ChannelsPage_Loaded;
         
        }

        void ChannelsPage_Loaded(object sender, RoutedEventArgs e)
        {
            appSettings = new AppSettings();
            this.isolatedSettings(); // here you are calling method that uses isolated class

            var deviceId = DeviceExtendedProperties.GetValue("DeviceUniqueId"); // devide id of your Wp7
            byte[] bID = (byte[])deviceId;
            string deviceID = Convert.ToBase64String(bID);
        }


if possible instantiate "settings" Class as

if (!System.ComponentModel.DesignerProperties.IsInDesignTool)

                {

                    settings = AppSettings();// where you lode entire data from isolated storage

                }

Play Lyrics in Windows Media Player

Windows media player can not only play songs but also display lyrics in synchronization with the song being played. All you need is windows media player and a plugin(Lyrics Plugin) for playing lyrics.
Click on download to get the plugin.

Follow the slides shown;

Select a song and click on play, player automatically searches for lyrics on web and displays them.