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Description
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This book covers from installation to application design and implementation to deployment. One of the most detailed books on new WPF technology, it provides you with the no-nonsense, practical advice you need in order to build high-quality WPF applications quickly and easily.
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If you have built any video enabled application prior to WPF, you must be familiar with the Windows Media Player ActiveX control. The WPF library provides the MediaElement control that encapsulates Windows Media Player functionality.
The MediaElement tag in XAML allows you to play videos in XAML and WPF. The Source attribute of the tag takes the full path of the video. The following code snippet uses the MediaElement to display a video.
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<MediaElement Name="VideoControl" Width="200" Height ="400"
Source="C:\Windows\System32\oobe\images\intro.wmv" >
</MediaElement> |
The file can also be an Mpeg. The following code snippet plays a Mpeg video.
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<MediaElement Name="VideoControl" Width="200" Height ="400"
Source="C:\TestV.MPG" >
</MediaElement> |
The Width and Height attributes sets the width and height of the control respectively.
Setting MediaElement Properties Dynamically
You can also access the control programmatically and set its properties in your code. The following code snippet sets the MediaControls properties at run-time.
VideoControl.Volume = 100;
VideoControl.Width = 440;
VideoControl.Height = 280;
The Application
Now let's build our video application. I want to create an application looks like Figure 1. As you can see from this figure, the Browse button allows me to browse a video file and Play, Pause, and Stop buttons plays, pauses, and stops the video.
Figure 1. Video enabled WPF application
The code listed in Listing 1 creates the user interface screen.
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<TextBox Height="20" Margin="10,7,134,0" Name="MediaPathTextBox" VerticalAlignment="Top" ></TextBox>
<Button Height="20" HorizontalAlignment="Right" Margin="0,6,14,0" Name="BrowseButton"
VerticalAlignment="Top" Width="94" Click="BrowseClick">
Browse Media
</Button>
<MediaElement Canvas.Left="20" Canvas.Top ="40"
Name="VideoControl" LoadedBehavior="Manual" UnloadedBehavior="Stop" >
</MediaElement>
<Button Height="23" HorizontalAlignment="Left" Margin="15,0,0,13"
Name="PlayButton" VerticalAlignment="Bottom" Width="75"
Click="PlayClick">
Play</Button>
<Button Height="23" HorizontalAlignment="Left" Margin="103,0,0,13"
Name="PauseButton" VerticalAlignment="Bottom" Width="75"
Click="PauseClick">
Pause</Button>
<Button Height="23" Margin="191,0,186,13" Name="StopButton"
VerticalAlignment="Bottom" Click="StopClick">
Stop</Button>
</Grid> |
Listing 1.
The code behind looks like Listing 2. As you can see from this code, on Windows1 constructor I sent the Volume, Width, and Height of the control.
The Browse button click event handler calls OpenFileDialog, which let us browse the files and sets the MediaPathTextBox.Text as the media file name.
The Play, Pause, and Stop button click handlers simply calls Play, Pause, and Stop methods of the MediaElement control.
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<TextBox Height="20" Margin="10,7,134,0" Name="MediaPathTextBox" VerticalAlignment="Top" ></TextBox>
<Button Height="20" HorizontalAlignment="Right" Margin="0,6,14,0" Name="BrowseButton"
VerticalAlignment="Top" Width="94" Click="BrowseClick">
Browse Media
</Button>
<MediaElement Canvas.Left="20" Canvas.Top ="40"
Name="VideoControl" LoadedBehavior="Manual" UnloadedBehavior="Stop" >
</MediaElement>
<Button Height="23" HorizontalAlignment="Left" Margin="15,0,0,13"
Name="PlayButton" VerticalAlignment="Bottom" Width="75"
Click="PlayClick">
Play</Button>
<Button Height="23" HorizontalAlignment="Left" Margin="103,0,0,13"
Name="PauseButton" VerticalAlignment="Bottom" Width="75"
Click="PauseClick">
Pause</Button>
<Button Height="23" Margin="191,0,186,13" Name="StopButton"
VerticalAlignment="Bottom" Click="StopClick">
Stop</Button>
</Grid>
public Window1()
{
InitializeComponent();
VideoControl.Volume = 100;
VideoControl.Width = 440;
VideoControl.Height = 280;
}
void BrowseClick(Object sender, EventArgs e)
{
OpenFileDialog openDlg = new OpenFileDialog();
openDlg.InitialDirectory = @"c:\";
openDlg.ShowDialog();
MediaPathTextBox.Text = openDlg.FileName;
}
void PlayClick(object sender, EventArgs e)
{
if (MediaPathTextBox.Text.Length <= 0)
{
System.Windows.Forms.MessageBox.Show("Enter a valid media file");
return;
}
VideoControl.Source = new Uri(MediaPathTextBox.Text);
VideoControl.Play();
}
void PauseClick(object sender, EventArgs e)
{
VideoControl.Pause();
}
void StopClick(object sender, EventArgs e)
{
VideoControl.Stop();
} |
Listing 2.
Download the attached source code for more details.
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Contents added by
Mahesh Chand
on
Jul 05, 2009
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Complex Sample Application
Here is a complete sample project come with .NET Framework samples. I have updated the project so it runs in Visual Studio 2008 including the complete solution.
The UI of the application looks like this.
To run your videos, you need to change the Media folder and videos in this folder.
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Mahesh Chand
Mahesh is a software developer with over 13 years of experience building systems for Financial and Banking, Engineering & Architectural, Imaging, Construction, Biological & Pharmaceuticals, Healthcare and Education industries. His expertise is Windows Forms, ASP.NET, Silverlight, WPF, WCF, Visual Studio 2010, SQL Server, and Oracle. If you are looking for a Windows Forms, ASP.NET, WPF, Silverlight, C#, VB.NET, Oracle, and SQL Server Consultant in Philadelphia area or remote location, drop me a line at MAHESH [AT] C-SHARPCORNER [DOT] COM.
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