Loading XAML at runtime?

As Jakob Christensen noted, you can load any XAML you want using XamlReader.Load. This doesn't apply only for styles, but UIElements as well. You just load the XAML like:

UIElement rootElement;
FileStream s = new FileStream(fileName, FileMode.Open);
rootElement = (UIElement)XamlReader.Load(s);
s.Close();

Then you can set it as the contents of the suitable element, e.g. for

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Foo Bar">
    <Grid x:Name="layoutGrid">
        <!-- any static elements you might have -->
    </Grid>
</Window>

you could add the rootElement in the grid with:

layoutGrid.Children.Add(rootElement);
layoutGrid.SetColumn(rootElement, COLUMN);
layoutGrid.SetRow(rootElement, ROW);

You'll naturally also have to connect any events for elements inside the rootElement manually in the code-behind. As an example, assuming your rootElement contains a Canvas with a bunch of Paths, you can assign the Paths' MouseLeftButtonDown event like this:

Canvas canvas = (Canvas)LogicalTreeHelper.FindLogicalNode(rootElement, "canvas1");
foreach (UIElement ui in LogicalTreeHelper.GetChildren(canvas)) {
    System.Windows.Shapes.Path path = ui as System.Windows.Shapes.Path;
    if (path != null) {
        path.MouseLeftButtonDown += this.LeftButtonDown;
    }
}

I've not tried switching XAML files on the fly, so I cannot say if that'll really work or not.

I think this is fairly simple with the XamlReader, give this a shot, didn't try it myself, but I think it should work.

http://blogs.msdn.com/ashish/archive/2007/08/14/dynamically-loading-xaml.aspx

I made simple markup extension, which loads xaml:

public class DynamicXamlLoader : MarkupExtension
{
    public DynamicXamlLoader() { }

    public DynamicXamlLoader(string xamlFileName)
    {
        XamlFileName = xamlFileName;
    }

    public string XamlFileName { get; set; }

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        var provideValue = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
        if (provideValue == null || provideValue.TargetObject == null) return null;

        // get target
        var targetObject = provideValue.TargetObject as UIElement;
        if (targetObject == null) return null;

        // get xaml file
        var xamlFile = new DirectoryInfo(Directory.GetCurrentDirectory())
            .GetFiles(XamlFileName ?? GenerateXamlName(targetObject), SearchOption.AllDirectories)
            .FirstOrDefault();

        if (xamlFile == null) return null;

        // load xaml
        using (var reader = new StreamReader(xamlFile.FullName))
            return XamlReader.Load(reader.BaseStream) as UIElement;
    }

    private static string GenerateXamlName(UIElement targetObject)
    {
        return string.Concat(targetObject.GetType().Name, ".xaml");
    }
}

Usage:

This find and load MyFirstView.xaml file

<ContentControl Content="{wpf:DynamicXamlLoader XamlFileName=MyFirstView.xaml}" />

And this fill whole UserControl (find and load MySecondView.xaml file)

<UserControl x:Class="MySecondView"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Content="{wpf:DynamicXamlLoader}" />

Loading XAML at runtime?

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