XML无法正确解析属性

我正在编写一个简单的任务秒表应用程序，以在我们的EBS系统中使用。

我正在尝试将任务列表序列化为xml并以相同的方式加载它。这是导出的XML任务列表的示例：

<?xml version="1.0" encoding="utf-8"?>
<Task Task_Name="MainTask" Original_Estimated_Time="10:10:00" Current_Estimated_Time="10:10:00" Elapsed_Time="00:00:00">
    <Task Task_Name="Task 2" Original_Estimated_Time="05:00:00" Current_Estimated_Time="05:00:00" Elapsed_Time="00:00:00" />
    <Task Task_Name="Task 3" Original_Estimated_Time="15:00:00" Current_Estimated_Time="15:00:00" Elapsed_Time="00:00:00" />
</Task>

当我导入它时，我创建了一个称为TaskNodes的特殊TreeNode来将信息保存在内存中。但是，子节点未填充正确的标题字符串（如您从此屏幕快照中看到的那样）：

这是用于所有XML加载的代码，我看不到根节点和子节点之间发生的区别：

    private void button1_Click(object sender, EventArgs e)
    {
        OpenFileDialog dlg = new OpenFileDialog();
        dlg.Title = "Open XML Document";
        dlg.Filter = "XML Files (*.xml)|*.xml";
        dlg.FileName = Application.StartupPath + "\\..\\..\\example.xml";
        if (dlg.ShowDialog() == DialogResult.OK)
        {
            try
            {
                //Just a good practice -- change the cursor to a 
                //wait cursor while the nodes populate
                this.Cursor = Cursors.WaitCursor;
                //First, we'll load the Xml document
                XmlDocument xDoc = new XmlDocument();
                xDoc.Load(dlg.FileName);
                //Now, clear out the treeview, 
                //and add the first (root) node
                treeView1.Nodes.Clear();
                treeView1.Nodes.Add(new TaskNode(xDoc.DocumentElement.Attributes[0].Value + "", TimeSpan.Parse(xDoc.DocumentElement.Attributes[1].Value + ""), TimeSpan.Parse(xDoc.DocumentElement.Attributes[2].Value + ""), TimeSpan.Parse(xDoc.DocumentElement.Attributes[3].Value + "")));
                TaskNode tNode = (TaskNode)treeView1.Nodes[0];
                //We make a call to addTreeNode, 
                //where we'll add all of our nodes
                addTaskNode(xDoc.DocumentElement, tNode);
                //Expand the treeview to show all nodes
                treeView1.ExpandAll();
            }
            catch (XmlException xExc)
            //Exception is thrown is there is an error in the Xml
            {
                MessageBox.Show(xExc.Message);
            }
            catch (Exception ex) //General exception
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                this.Cursor = Cursors.Default; //Change the cursor back
            }
        }
    }

    //This function is called recursively until all nodes are loaded
    private void addTaskNode(XmlNode xmlNode, TaskNode taskNode)
    {
        XmlNode xNode;
        TaskNode tNode;
        XmlNodeList xNodeList;
        if (xmlNode.HasChildNodes) //The current node has children
        {
            xNodeList = xmlNode.ChildNodes;
            for (int x = 0; x <= xNodeList.Count - 1; x++)
            //Loop through the child nodes
            {
                xNode = xmlNode.ChildNodes[x];
                taskNode.Nodes.Add(new TaskNode(xNode.Attributes[0].Value + "", TimeSpan.Parse(xNode.Attributes[1].Value + ""), TimeSpan.Parse(xNode.Attributes[2].Value + ""), TimeSpan.Parse(xNode.Attributes[3].Value + "")));

                tNode = (TaskNode)taskNode.Nodes[x];
                addTaskNode(xNode, tNode);
            }
        }
        else //No children, so add the outer xml (trimming off whitespace)
            taskNode.Text = xmlNode.OuterXml.Trim();
    }