Load an *.edmx file

LoadEdmx.cs

MetadataWorkspace LoadEdmx(string path)
{
    var runtime = XElement.Load(path).Elements().First(e => e.Name.LocalName == "Runtime");

    EdmItemCollection edmCollection;
    var csdl = runtime.Elements().First(e => e.Name.LocalName == "ConceptualModels")
        .Elements().First(e => e.Name.LocalName == "Schema");
    using (var reader = csdl.CreateReader())
    {
        edmCollection = new EdmItemCollection(new[] { reader });
    }

    StoreItemCollection storeCollection;
    var ssdl = runtime.Elements().First(e => e.Name.LocalName == "StorageModels")
        .Elements().First(e => e.Name.LocalName == "Schema");
    using (var reader = ssdl.CreateReader())
    {
        storeCollection = new StoreItemCollection(new[] { reader });
    }

    StorageMappingItemCollection mappingCollection;
    var msl = runtime.Elements().First(e => e.Name.LocalName == "Mappings")
        .Elements().First(e => e.Name.LocalName == "Mapping");
    using (var reader = msl.CreateReader())
    {
        mappingCollection = new StorageMappingItemCollection(
            edmCollection,
            storeCollection,
            new[] { reader });
    }

    return new MetadataWorkspace(() => edmCollection, () => storeCollection, () => mappingCollection);
}