19 invitations to careers.stackoverflow.com giveaway

Maybe careers.stackoverflow.com will be useful for someone, so I have 19 invitations that I don’t need. Just click at this link: accept invitation.

invitations carreer stackexchange

The proposal remains valid as long as you see this post. If I don’t have invitations, I will delete the post.

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Windows Phone Marketplace app submitting

In this article I will show how the windows phone marketplace looks and how to publish apps there.

When you click the Submit App link, you will see the following page:
mainpage

Read more of this post

Windows Phone display images from URL

The built-in Image element is quite good for loading and displaying images from the web, because it loads them asynchronously in the background thread and doesn’t freeze UI.

In this example I will show how to display a loading indicator while the image is loading and an error message if the image loading has failed.

wp7_imageloading_loadingviewwp7_imageloading_imageview

You shouldn’t use the Source property in the XAML markup, instead you should set the Source property in the code-behind.

The XAML markup looks so:

<Grid x:Name="LayoutRoot" Background="Transparent">
    <TextBlock x:Name="loadingView" Visibility="Collapsed" Text="Loading..." VerticalAlignment="Center" HorizontalAlignment="Center" />
    <TextBlock x:Name="errorView" Visibility="Collapsed" VerticalAlignment="Center" HorizontalAlignment="Center" />
    <Image x:Name="imageView" Visibility="Collapsed" />
</Grid>

The code-behind:

public partial class MainPage : PhoneApplicationPage
{
    public MainPage()
    {
        InitializeComponent();

        var bitmap = new BitmapImage(new Uri("http://upload.wikimedia.org/wikipedia/commons/6/63/Wikipedia-logo.png"));
        bitmap.ImageFailed += (s, e) => this.ShowError("Error while loading the image.");
        bitmap.ImageOpened += (s, e) => this.ShowImage();

        this.ShowLoading();
        this.imageView.Source = bitmap;
    }

    private void ShowLoading()
    {
        this.loadingView.Visibility = Visibility.Visible;
        this.imageView.Visibility = Visibility.Collapsed;
        this.errorView.Visibility = Visibility.Collapsed;
    }

    private void ShowError(string message)
    {
        this.loadingView.Visibility = Visibility.Collapsed;
        this.imageView.Visibility = Visibility.Collapsed;
        this.errorView.Visibility = Visibility.Visible;

        this.errorView.Text = message;
    }

    private void ShowImage()
    {
        this.loadingView.Visibility = Visibility.Collapsed;
        this.imageView.Visibility = Visibility.Visible;
        this.errorView.Visibility = Visibility.Collapsed;
    }
}

At first I create the BitmapImage instance, after the creation of this object I subscribe to its events ImageFailed and ImageOpened. Then I display the loading indicator (the ShowLoading method). And as soon as the line ‘this.imageView.Source = bitmap’ is called, the image loading process starts. After some time either ShowError or ShowImage will be called.

The sample application you can download here: https://dl.dropbox.com/u/8047386/WordPress/PhoneImageLoadingSample.zip