private void ExtractChildren(XmlNode parentXml, TreeNode parent)
{
IEnumerable<Tuple<XmlNode, TreeNode>> children = from childXml in parentXml.ChildNodes.OfType<XmlNode>()
where
childXml.Name == "Node" &&
childXml.Attributes["Id"] != null
let childNode =
_nodeManager.GetNodeById(
childXml.Attributes["Id"].Value)
let childTreeNode = parent.AddChild(childNode)
select Tuple.Create(childXml, childTreeNode);
Parallel.ForEach(children, child => ExtractChildren(child.Item1, child.Item2));
}
public KnowledgeTreeManager(string xmlFilePath, INodeManager nodeManager)
{
XmlFilePath = xmlFilePath;
_nodeManager = nodeManager;
Root = new TreeNode(null);
try
{
ReloadTree();
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
Debug.WriteLine(e.StackTrace);
// Simply reset the Root object if load failed.
ResetTree();
}
}
/// <summary>
/// 给树节点增加子节点<paramref name="node"/>。
/// </summary>
public TreeNode AddChild(Node node)
{
var child = new TreeNode(node, this);
_children.Add(child);
return child;
}
/// <summary>
/// 构造一个<see cref="TreeNode"/>，
/// 其对应节点为<paramref name="node"/>，父节点为<paramref name="parent"/>。
/// </summary>
public TreeNode(Node node, TreeNode parent = null)
{
_node = node;
Parent = parent;
}
private static void WriteTreeNode(TreeNode node, XmlWriter writer)
{
writer.WriteStartElement("Node");
writer.WriteAttributeString("Id", node.Id);
foreach (TreeNode child in node.Children)
WriteTreeNode(child, writer);
writer.WriteEndElement();
}
public void ResetTree()
{
Root = new TreeNode(null);
}
public TreeNodeViewModel(TreeNode treeNode, TreeViewItemViewModel parent) : base(parent)
{
_treeNode = treeNode;
LoadChildren();
}
public void AddChild(TreeNode treeNode)
{
ChildrenSource.Add(new TreeNodeViewModel(treeNode, this));
}
public TreeNodeViewModel(TreeNode treeNode) : this(treeNode, null)
{
}