Xamarin - Show image from base64 string

The type of your Image property should be ImageSource, not Image, as you apparently want to bind an ImageCell's ImageSource property. Besides that, calling OnPropertyChanged in a property getter never works, because the PropertyChanged event has to be fired before a binding (or any other consumer) can get a changed property value.

Instead of Image.Source="{Binding ...}, the correct binding would have to be

<ImageCell ... ImageSource="{Binding Path=Image}" />

The properties should be declared like this:

private string imageBase64;public string ImageBase64{    get { return imageBase64; }    set    {        imageBase64 = value;        OnPropertyChanged("ImageBase64");        Image = Xamarin.Forms.ImageSource.FromStream(            () => new MemoryStream(Convert.FromBase64String(imageBase64)));    } }private Xamarin.Forms.ImageSource image;public Xamarin.Forms.ImageSource Image{    get { return image; }    set    {        image = value;        OnPropertyChanged("Image");    }}

If you really need lazy creation of the Image property value, you could make it read-only, and make the corresponding OnPropertyChanged call in the ImageBase64 setter:

private string imageBase64public string ImageBase64{    get { return imageBase64; }    set    {        imageBase64 = value;        OnPropertyChanged("ImageBase64");        OnPropertyChanged("Image");    } }private Xamarin.Forms.ImageSource image;public Xamarin.Forms.ImageSource Image{    get    {        if (image == null)        {            image = Xamarin.Forms.ImageSource.FromStream(                () => new MemoryStream(Convert.FromBase64String(ImageBase64)));        }        return image;    }}