/// <summary>
/// Perform the actual insertion</summary>
/// <param name="context">Must implement IHierarchicalInsertionContext and/or
/// IInstancingContext to succeed</param>
/// <param name="parent">Optional. Parent object to which the new child is added. Can be null
/// if the context supports it.</param>
/// <param name="child">New child object to be inserted into the specified parent</param>
private static void DoInsert(object context, object parent, object child)
{
IHierarchicalInsertionContext hierarchicalInsertionContext = context.As <IHierarchicalInsertionContext>();
if (hierarchicalInsertionContext != null)
{
hierarchicalInsertionContext.Insert(parent, child);
}
else
{
IInstancingContext instancingContext = context.As <IInstancingContext>();
if (instancingContext != null)
{
instancingContext.Insert(child);
}
}
}
/// <summary>
/// Indicates if the specified child can be inserted into the specified parent object</summary>
/// <param name="context">Must implement IHierarchicalInsertionContext and/or
/// IInstancingContext to succeed</param>
/// <param name="parent">Optional. Parent object we want to insert into. Can be null if the
/// context supports it.</param>
/// <param name="child">Child object to be inserted into the specified parent</param>
/// <returns>True iff the child can be inserted into the parent (or the context supports
/// parent-less insertion)</returns>
/// <remarks>The context must implement IHierarchicalInsertionContext and/or IInstancingContext
/// to allow insertion. If the context implements both, IHierarchicalInsertionContext is preferred and
/// any insertion logic in the IInstancingContext implementation is ignored!</remarks>
public static bool CanInsert(object context, object parent, object child)
{
IHierarchicalInsertionContext hierarchicalInsertionContext = context.As <IHierarchicalInsertionContext>();
if (hierarchicalInsertionContext != null)
{
return(hierarchicalInsertionContext.CanInsert(parent, child));
}
else
{
IInstancingContext instancingContext = context.As <IInstancingContext>();
if (instancingContext != null)
{
return(instancingContext.CanInsert(child));
}
}
return(false);
}
