Accessing Entity Framework Entities In EntityDataSource Data-Bound Controls

If using ASP.NET EntityDataSource and databound controls you may need to access the actual entity object being represented in the control, e.g. a data row in a table or a single entity in a FormView. The actual entity is not readily available however as it is automatically wrapped in a System.Web.UI.WebControls.EntityDataSourceWrapper which is not accessible. The extension method below allows you to gain access to the strongly typed, underlying entity. It is based on the article by Diego Vega which explains the wrapping behaviour in more detail. 

 /// <summary>
/// Gets the actual EF entity object that is being wrapped and databound.
/// </summary>
/// <example>
/// Advert ad = myFormView.DataItem.WrappedEntity<Advert>();
/// (where myFormView is databound to EntityDataSource returning Advert entity)
/// </example>
static class WrappedEFEntityExtensions
{
    public static TEntity WrappedEntity<TEntity>(this object dataItem) where TEntity : class
    {
        var entity = dataItem as TEntity;

        if (entity != null)
            return entity;

        var typeDescriptor = dataItem as ICustomTypeDescriptor;

        if (typeDescriptor != null)
            return (TEntity)typeDescriptor.GetPropertyOwner(null);

        return null;
    }
}

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