如何使用Linq to Xml通过递归查询获取树数据？

Question

我有来自restful 服务的以下类型的xml 数据：

<nodeData>  
  <nodeObject>  
    <nodeName>Node 1</nodeName>
    <nodeChildren>
      <nodeObject>
        <nodeName>Node 1-1</nodeName>
        <nodeChildren>
          <nodeObject>
            <nodeName>Leaf 1-1-1</nodeName>
          </nodeObject>
          <nodeObject>
            <nodeName>Leaf 1-1-2</nodeName>
          </nodeObject>
          <nodeObject>
            <nodeName>Leaf 1-1-3</nodeName>
          </nodeObject>
          <nodeObject>
            <nodeName>schedule 4.pdf</nodeName>
          </nodeObject>
        </nodeChildren>
      </nodeObject>
      <nodeObject>
        <nodeName>Node 1-2</nodeName>
        <nodeChildren>
          <nodeObject>
            <nodeName>Leaf 1-2-1</nodeName>
          </nodeObject>
        </nodeChildren>
      </nodeObject>
    </nodeChildren>
  </nodeObject>
  <nodeObject>
    <nodeName>Node 2</nodeName>
    <nodeChildren>
      <nodeObject>
        <nodeName>Node 2-1</nodeName>
        <nodeChildren>
          <nodeObject>
            <nodeName>Leaf 2-1-1</nodeName>
          </nodeObject>
        </nodeChildren>
      </nodeObject>
    </nodeChildren>
  </nodeObject>
......
</nodeData> 

所以我想获取树数据来填充sliverlight 中的树视图。我做了如下操作：

创建一个内部类：

public class nodeObject
    {
        public string nodeName { get; set; }
        public IEnumerable<nodeObject> nodeChildren { get; set; }
    }

将 Linq 编写为：

void proxy_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            if (e.Error == null)
            {
                XDocument xml = XDocument.Parse(e.Result);
                var dataSource = (from results in xml.Descendants("nodeObject")
                                  select new nodeObject
                                  {
                                    nodeName = results.Element("nodeName").Value.ToString(),
                                    nodeChildren = this.GetChilden(results)
                                  });

                this.dataTree.ItemsSource = dataSource.ToList();             
            }
        }

        private IEnumerable<nodeObject> GetChilden(XElement parent)
        {
            return (from results in parent.Descendants("nodeObject")
                    select new nodeObject
                    {
                        nodeName = results.Element("nodeName").Value.ToString(),
                    }).ToList<nodeObject>();
        }

然后运行 ​​silverlight 应用程序。树视图中的数据显示为（只有2级，有很多重复）：

Node 1
  Node 1-1
  Leaf 1-1-1
  Leaf 1-1-2
  Leaf 1-1-3
  Node 1-2
  Leaf 2-1-1
Node 1-1
  Leaf 1-1-1
  Leaf 1-1-2
  Leaf 1-1-3
  Node 1-2
  Leaf 2-1-1
Node 1-2
  Leaf 2-1-1
Node 2
  Node 2-1
  Leaf 2-1-1
Node 2-1
  Leaf 2-1-1

但是预期的显示应该像（没有叶子）：

Node 1
  Node 1-1
  Node 1-2
Node 2
  Node 2-1

或者像（包括叶子）：

Node 1
  Node 1-1
    Leaf 1-1-1
    Leaf 1-1-2
    Leaf 1-1-3
  Node 1-2
    Leaf 2-1-1
Node 2
  Node 2-1
    Leaf 2-1-1

如何解决这个问题？

Answer 1

弄清楚了：这是因为 xaml 中的绑定问题。 Linq 查询没问题。