C#常用操作类库三(XML操作类)

   ///   <summary>
         ///  XmlHelper 的摘要说明。
         ///  xml操作类
         ///   </summary>
         public  class XmlHelper
        {
             protected  string strXmlFile;
             protected XmlDocument objXmlDoc =  new XmlDocument();

             public XmlHelper( string XmlFile)
            {
                 //  
                 //  TODO: 在这里加入建构函式的程序代码 
                 //  
                 try
                {
                    
                    objXmlDoc.Load(XmlFile);
                }
                 catch (System.Exception ex)
                {
                     throw ex;
                }
                strXmlFile = XmlFile;
            }

             public DataTable  GetData( string XmlPathNode)
            {
                 // 查找数据。返回一个DataView 
                DataSet ds =  new DataSet();
                StringReader read =  new StringReader(objXmlDoc.SelectSingleNode(XmlPathNode).OuterXml);
                ds.ReadXml(read);
                 return ds.Tables[ 0];
            }
             ///   <summary>
             ///  新节点内容。
             ///  示例：xmlTool.Replace("Book/Authors[ISBN=\"0002\"]/Content","ppppppp"); 
             ///   </summary>
             ///   <param name="XmlPathNode"></param>
             ///   <param name="Content"></param>
             public  void Replace( string XmlPathNode,  string Content)
            {
                 // 更新节点内容。 
                objXmlDoc.SelectSingleNode(XmlPathNode).InnerText = Content;
            }

             ///   <summary>
             ///  删除一个指定节点的子节点。 
             ///  示例： xmlTool.DeleteChild("Book/Authors[ISBN=\"0003\"]"); 
             ///   </summary>
             ///   <param name="Node"></param>
             public  void DeleteChild( string Node)
            {
                 // 删除一个节点。 
                 string mainNode = Node.Substring( 0, Node.LastIndexOf( " / "));
                objXmlDoc.SelectSingleNode(mainNode).RemoveChild(objXmlDoc.SelectSingleNode(Node));
            }

           

             ///   <summary>
                      
             ///   * 使用示列:
           ///   示例： XmlHelper.Delete( "/Node", "")
          ///   XmlHelper.Delete( "/Node", "Attribute")
            ///   </summary>
             ///   <param name="node"> 节点 </param>
             ///   <param name="attribute"> 属性名，非空时删除该节点属性值，否则删除节点值 </param>
             public    void Delete(   string node,  string attribute)
        {
             try
            {
               
                XmlNode xn = objXmlDoc.SelectSingleNode(node);
                XmlElement xe = (XmlElement)xn;
                 if (attribute.Equals( ""))
                    xn.ParentNode.RemoveChild(xn);
                 else
                    xe.RemoveAttribute(attribute);
               
            }
             catch { }
        }
  

             ///   <summary>
             ///  插入一节点和此节点的一子节点。 
             ///  示例：xmlTool.InsertNode("Book","Author","ISBN","0004"); 
             ///   </summary>
             ///   <param name="MainNode"> 主节点 </param>
             ///   <param name="ChildNode"> 子节点 </param>
             ///   <param name="Element"> 元素 </param>
             ///   <param name="Content"> 内容 </param>
             public  void InsertNode( string MainNode,  string ChildNode,  string Element,  string Content)
            {
                 // 插入一节点和此节点的一子节点。 
                XmlNode objRootNode = objXmlDoc.SelectSingleNode(MainNode);
                XmlElement objChildNode = objXmlDoc.CreateElement(ChildNode);
                objRootNode.AppendChild(objChildNode);
                XmlElement objElement = objXmlDoc.CreateElement(Element);
                objElement.InnerText = Content;
                objChildNode.AppendChild(objElement);
            }

             ///   <summary>
             ///  插入一个节点，带一属性。
             ///  示例： xmlTool.InsertElement("Book/Author[ISBN=\"0004\"]","Title","Sex","man","iiiiiiii"); 
             ///   </summary>
             ///   <param name="MainNode"> 主节点 </param>
             ///   <param name="Element"> 元素 </param>
             ///   <param name="Attrib"> 属性 </param>
             ///   <param name="AttribContent"> 属性内容 </param>
             ///   <param name="Content"> 元素内容 </param>
             public  void InsertElement( string MainNode,  string Element,  string Attrib,  string AttribContent,  string Content)
            {
                 // 插入一个节点，带一属性。 
                XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
                XmlElement objElement = objXmlDoc.CreateElement(Element);
                objElement.SetAttribute(Attrib, AttribContent);
                objElement.InnerText = Content;
                objNode.AppendChild(objElement);
            }
             ///   <summary>
             ///  插入一个节点，不带属性。
             ///  示例：xmlTool.InsertElement("Book/Author[ISBN=\"0004\"]","Content","aaaaaaaaa"); 
             ///   </summary>
             ///   <param name="MainNode"> 主节点 </param>
             ///   <param name="Element"> 元素 </param>
             ///   <param name="Content"> 元素内容 </param>
             public  void InsertElement( string MainNode,  string Element,  string Content)
            {
                 // 插入一个节点，不带属性。 
                XmlNode objNode = objXmlDoc.SelectSingleNode(MainNode);
                XmlElement objElement = objXmlDoc.CreateElement(Element);
                objElement.InnerText = Content;
                objNode.AppendChild(objElement);
            }

             ///   <summary>
             ///  对xml文件做插入，更新，删除后需做Save()操作，以保存修改
             ///   </summary>
             public  void Save()
            {
                 // 保存文檔。 
                 try
                {
                    objXmlDoc.Save(strXmlFile);
                }
                 catch (System.Exception ex)
                {
                     throw ex;
                }
                objXmlDoc =  null;
            }
        }

         // ========================================================= 

         // 实例应用： 

         // string strXmlFile = Server.MapPath("TestXml.xml"); 
         // XmlControl xmlTool = new XmlControl(strXmlFile); 

         //  数据显视 
         //  dgList.DataSource = xmlTool.GetData("Book/Authors[ISBN=\"0002\"]"); 
         //  dgList.DataBind(); 

         //  更新元素内容 
         //  xmlTool.Replace("Book/Authors[ISBN=\"0002\"]/Content","ppppppp"); 
         //  xmlTool.Save(); 

         //  添加一个新节点 
         //  xmlTool.InsertNode("Book","Author","ISBN","0004"); 
         //  xmlTool.InsertElement("Book/Author[ISBN=\"0004\"]","Content","aaaaaaaaa"); 
         //  xmlTool.InsertElement("Book/Author[ISBN=\"0004\"]","Title","Sex","man","iiiiiiii"); 
         //  xmlTool.Save(); 

         //  删除一个指定节点的所有内容和属性 
         //  xmlTool.Delete("Book/Author[ISBN=\"0004\"]"); 
         //  xmlTool.Save(); 

         //  删除一个指定节点的子节点 
         //  xmlTool.Delete("Book/Authors[ISBN=\"0003\"]"); 
         //  xmlTool.Save();