private static IGraphNode BuildNodeHelper(string name, object data, Type type, IGraphNode parent, string propertyName, IXamlObjectGraphBuilder builder, bool isReadOnly)
{
IGraphNode node = builder.BuildNode(name, data, type, parent, propertyName, isReadOnly);
if (node == null)
{
return(node);
}
ObjectGraphWalker.SetObjectData(node, data);
ObjectGraphWalker.SetObjectType(node, type);
return(node);
}
private static IGraphNode BuildGraph(string name, object data, Type type, IGraphNode parent, IXamlObjectGraphBuilder builder)
{
Queue <IGraphNode> pendingQueue = new Queue <IGraphNode>();
Dictionary <int, IGraphNode> visitedObjects = new Dictionary <int, IGraphNode>();
IGraphNode root = ObjectGraphWalker.BuildNodeHelper(name, data, type, parent, null, builder, false);
pendingQueue.Enqueue(root);
while (pendingQueue.Count != 0)
{
IGraphNode node = pendingQueue.Dequeue();
object nodeData = ObjectGraphWalker.GetObjectData(node);
Type nodeType = ObjectGraphWalker.GetObjectType(node);
// clear the properties so they don't potentially get serialized
ObjectGraphWalker.ClearObjectData(node);
ObjectGraphWalker.ClearObjectType(node);
if (nodeData == null || nodeType.IsPrimitive == true ||
nodeType == typeof(System.String))
{
// we have reached a leaf node //
continue;
}
if (visitedObjects.Keys.Contains(nodeData.GetHashCode()))
{
// Caused by a cycle - alredy seen this node //
IGraphNode builtNode = visitedObjects[nodeData.GetHashCode()];
foreach (IGraphNode newChild in builder.BuildVisitedNode(builtNode, node))
{
node.Children.Add(newChild);
}
//node.Children.Add(visitedObjects[nodeData.GetHashCode()]);
continue;
}
// ok the type is a complex type - query all properties //
// create children for clr properties //
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(nodeData);
foreach (PropertyDescriptor property in properties)
{
if (ObjectGraphWalker.IsReadablePropertyDescriptor(property))
{
object value = null;
try
{
value = property.GetValue(nodeData);
}
catch (Exception ex) // jasonv - approved; convert exception into value
{
value = ex;
}
IGraphNode childNode = ObjectGraphWalker.BuildNodeHelper(property.Name, value, property.PropertyType, node, property.Name, builder, property.IsReadOnly);
if (childNode == null)
{
continue;
}
IGraphNode actualChild = childNode;
while (actualChild.Parent != node)
{
actualChild = actualChild.Parent;
if (actualChild == null)
{
throw new InvalidOperationException("Node returned from BuildNode has invalid parent.");
}
}
node.Children.Add(actualChild);
pendingQueue.Enqueue(childNode);
}
}
// IEnumerable support //
int count = 0;
IEnumerable enumerableData = nodeData as IEnumerable;
if (enumerableData != null && nodeData.GetType() != typeof(System.String))
{
IGraphNode collectionParent = builder.BuildCollectionWrapperNode(node);
if (collectionParent != null)
{
node.Children.Add(collectionParent);
}
else
{
collectionParent = node;
}
IEnumerator enumerator = enumerableData.GetEnumerator();
while (enumerator.MoveNext())
{
IGraphNode childNode = ObjectGraphWalker.BuildNodeHelper("IEnumerable" + count++, enumerator.Current, enumerator.Current == null ? typeof(object) : enumerator.Current.GetType(), collectionParent, null, builder, false);
if (childNode == null)
{
continue;
}
collectionParent.Children.Add(childNode);
pendingQueue.Enqueue(childNode);
}
}
visitedObjects.Add(nodeData.GetHashCode(), node);
}
return(root);
}
public static IGraphNode Create(object data, IXamlObjectGraphBuilder builder)
{
return(ObjectGraphWalker.BuildGraph("Root", data, data.GetType(), null, builder));
}
/// <summary>
/// Build and ObjectGraph following the rules of XAML
/// - gives back an ObjectGraph which wraps the object
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static ObjectGraph Create(object data)
{
XamlObjectGraphBuilder builder = new XamlObjectGraphBuilder();
return((ObjectGraph)ObjectGraphWalker.Create(data, builder));
}
// Checks if GetValue may be called on the given PropertyDescriptor.
private static bool IsReadablePropertyDescriptor(PropertyDescriptor property)
{
return(!(property.ComponentType is System.Reflection.MemberInfo) ||
!ObjectGraphWalker.IsGenericTypeMember(property.ComponentType, property.Name));
}