解决了XMLTextReader的用法的一个难题，EndElement

如下，CodeGuru或者CodeProject上找到的例子都没有处理 像这样的情形 :
<a name="test" />  就是没有 </a>标签的情形，这时候处理a元素是不会碰到 EndElement的。
这里做了一个处理，即判断其深度。

XmlTextReader reader = null;
            try
            {
                reader = new XmlTextReader(streamReader);
                startDocument(); //开始分析

                int dept = -1;
                while (reader.Read())
                {
                    switch (reader.NodeType)
                    {                        
                        case XmlNodeType.Element:
                            Hashtable attributes = new Hashtable();
                            string strURI = reader.NamespaceURI;
                            string strName = reader.Name;
                            if (reader.HasAttributes)
                            {
                                for (int i = 0; i < reader.AttributeCount; i++)
                                {
                                    reader.MoveToAttribute(i);
                                    attributes.Add(reader.Name, reader.Value);
                                }
                            }
                            startElement(strURI, strName, strName, attributes);
                            if(dept != -1 && reader.Depth <= dept)                        //处理 "/>"的标签
                                endElement(string.Empty, reader.Name, string.Empty);
                            dept = reader.Depth;
                            break;
                        case XmlNodeType.EndElement:
                            endElement(string.Empty, reader.Name, string.Empty);
                            break;
                        case XmlNodeType.Text:
                            characters(reader.Value);
                            break;
                        default:
                            break;
                    }
                }
                return (Namespace) objectStack.Pop();
            }
            catch (XmlException e)
            {
                Console.WriteLine("error occured: " + e.Message);
            }
            finally
            {
                if(reader != null) reader.Close();
            }