Windows Phone - using DependencyProperty within MediaElement - windows

Question

This is the code I have in my custom UserControl:
generic.xaml:
<UserControl x:Class="SoundControl.SoundClass"
x:Name="Uc"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<StackPanel HorizontalAlignment="Stretch">
<Grid x:Name="mygrid"
Background="Transparent"
Width="Auto">
<Grid.RowDefinitions>
<RowDefinition Height="70*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="350*" />
<ColumnDefinition Width="70*" />
</Grid.ColumnDefinitions>
<Button x:Name="SoundButton"
Content="{Binding MyName, ElementName=Uc}"
Grid.Column="0"
Grid.Row="0"
Click="RingtoneButton_Click" />
<Button x:Name="RingtoneButton"
Grid.Column="1"
Grid.Row="0"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Click="RingtoneButton_Click">
<Image Source="/Images/note.png"
Stretch="Fill"
Height="30"
Width="30" />
</Button>
<MediaElement x:Name="SoundContainer"
Source="{Binding MySound, ElementName=Uc}"
AutoPlay="False" />
</Grid>
</StackPanel>
</UserControl>
SoundControl.cs
namespace SoundControl
{
public partial class SoundClass : UserControl
{
SaveRingtoneTask saveRingtoneChooser;
public SoundClass()
{
// For ringtone
saveRingtoneChooser = new SaveRingtoneTask();
saveRingtoneChooser.Completed += new EventHandler<TaskEventArgs>(saveRingtoneChooser_Completed);
}
public static readonly DependencyProperty SoundSourceProperty =
DependencyProperty.Register("MySound", typeof(MediaElement), typeof(SoundClass), null);
public static readonly DependencyProperty SoundNameProperty =
DependencyProperty.Register("MyName", typeof(string), typeof(SoundClass), null);
public MediaElement MySound
{
get { return (MediaElement)this.GetValue(SoundSourceProperty); }
set { base.SetValue(SoundSourceProperty, value); }
}
public string MyName
{
get { return (string)this.GetValue(SoundNameProperty); }
set { base.SetValue(SoundNameProperty, value); }
}
public SoundClass()
{
InitializeComponent();
}
private void SoundButton_Click(object sender, RoutedEventArgs e)
{
SoundContainer.Play();
}
private void RingtoneButton_Click(object sender, RoutedEventArgs e)
{
saveRingtoneChooser.Source = new Uri(SoundContainer.Source.AbsoluteUri);
saveRingtoneChooser.DisplayName = MyName;
saveRingtoneChooser.Show();
}
void saveRingtoneChooser_Completed(object sender, TaskEventArgs e)
{
switch (e.TaskResult)
{
//Logic for when the ringtone was saved successfully
case TaskResult.OK:
MessageBox.Show("Ringtone saved.");
break;
//Logic for when the task was cancelled by the user
case TaskResult.Cancel:
MessageBox.Show("Save cancelled.");
break;
//Logic for when the ringtone could not be saved
case TaskResult.None:
MessageBox.Show("Ringtone could not be saved.");
break;
}
}
}
}
and my MainPage.xaml
<SoundControl:SoundClass
HorizontalAlignment="Left"
Grid.Row="0"
VerticalAlignment="Top"
Grid.ColumnSpan="2"
Width="456"
MyName="TEST123"
MySound="/project/test.mp3"
/>
The problem is the XAML in Mainpage. The MySound property is giving me the error
The TypeConverter for "MediaElement" does not support converting from a string.
Any help you can provide will be greatly appreciated!

Answer 1

The Source property of the MediaElement type takes a Uri, not another MediaElement object. Change the type of the dependency property MySound to Uri, not MediaElement. (Don't forget also to replace typeof(MediaElement) with typeof(Uri) within SoundSourceProperty.)
Incidentally, I'd also recommend renaming the two dependency property identifiers you have (SoundSourceProperty and SoundNameProperty) to MySoundProperty and MyNameProperty respectively. There is a convention that the name of the dependency property's identifier (i.e. the public static readonly field) is the name of the property that uses it (in your case MySound or MyName) followed by Property. Some tools will expect this convention to be followed.