public IEnumerable<SPTreeNode> LoadChildren(SPTreeNode parentNode)
{
var model = parentNode.Model;
var index = model.Children.Count;
model.LoadChildren();
// Load new nodes
var list = new List<SPTreeNode>();
for (var count = index; count < parentNode.Model.Children.Count; count++)
{
var spNode = parentNode.Model.Children[count];
var treeNode = SPTreeNode.Create(this, spNode);
parentNode.Nodes.Insert(count, treeNode);
list.Add(treeNode);
}
var modelCollection = model as ISPNodeCollection;
if (modelCollection == null) return list;
// Add more node
if (modelCollection.LoadingChildren)
{
var moreNode = new MoreNode(modelCollection);
moreNode.NodeProvider = modelCollection.NodeProvider;
var spNode = SPMoreNode.Create(this, moreNode);
list.Add(spNode);
parentNode.Nodes.Add(spNode);
}
return list;
}
public IEnumerable<ISPNode> LoadCollectionChildren(ISPNodeCollection parentNode)
{
int batchCount = SPExplorerSettings.Current.BatchNodeLoad;
var list = new List<ISPNode>();
int count = 0;
if (parentNode.Pointer == null)
{
parentNode.ClearChildren();
parentNode.TotalCount = 0;
var collection = (IEnumerable)parentNode.SPObject;
parentNode.Pointer = collection.GetEnumerator();
//_pointer.Reset();
parentNode.MoveNext = parentNode.Pointer.MoveNext();
}
while (count <= batchCount && parentNode.MoveNext)
{
Type instanceType = parentNode.Pointer.Current.GetType();
ISPNode node = null;
if (parentNode.NodeTypes.ContainsKey(instanceType))
{
node = parentNode.NodeTypes[instanceType];
}
else
{
if (parentNode.DefaultNode != null)
{
node = parentNode.DefaultNode;
}
}
if (node != null)
{
// Always create a new node, because the object has to be unique for each item in the treeview.
var instanceNode = (ISPNode) Activator.CreateInstance(node.GetType());
instanceNode.NodeProvider = parentNode.NodeProvider;
instanceNode.SPObject = parentNode.Pointer.Current;
instanceNode.Setup(parentNode.SPObject);
list.Add(instanceNode);
}
parentNode.MoveNext = parentNode.Pointer.MoveNext();
count++;
parentNode.TotalCount++;
}
// If there is more nodes in the collection, add a "More" item.
if (count >= batchCount && parentNode.MoveNext)
{
var node = new MoreNode(parentNode);
node.Setup(parentNode.SPObject);
list.Add(node);
}
if (parentNode.TotalCount <= batchCount)
{
// There are a low number of nodes, therefore sort nodes by Text.
return list.OrderBy(p => p.Text);
}
// Just add the elements without any sort, because of the high number of nodes.
return list;
}