xml使用系统整理

1、 认识xml

可扩展标记语言，一种用于标记电子文档使其具有结果性的标记语言，它可以用来标记数据、定义数据类型，是一种允许用户对自己的标记语言进行定义的源语言。

2、 和超文本标记语言区别

2.1 html不一定需要成对出现，xml则一定需要成对出现。

2.2 html 不区分大小写，但是xml区分。

3、对xml文档增删改查

 1  //声明一个XmlDocument空对象 2         PRotected XmlDocument XmlDoc = new XmlDocument(); 3         /// <summary> 4         /// 构造函数，导入xml文件 5         /// </summary> 6         /// <param name="path"></param> 7         public XmlHelper(string path) 8         { 9             try10             {11                 XmlDoc.Load(path);12             }13             catch (Exception ex)14             {15                 throw ex;16             }17         }18         /// <summary>19         /// 保存文件20         /// </summary>21         /// <param name="path"></param>22         public void SaveXml(string path)23         {24             try25             {26                 XmlDoc.Save(path);27             }28             catch (System.Exception ex)29             {30                 throw ex;31             }32         }

 1  /// <summary> 2         /// 获取节点的子节点的内容 3         /// </summary> 4         /// <param name="path"></param> 5         /// <param name="rootNode"></param> 6         /// <param name="attributeName"></param> 7         /// <returns></returns> 8         public string GetNodeChildAttribute(string path, string rootNode, string attributeName) 9         {10             XmlNode xn = XmlDoc.SelectSingleNode(rootNode);11             StringBuilder sb = new StringBuilder();12             XmlNodeList xnl = xn.ChildNodes;13 14             foreach (XmlNode xnf in xnl)15             {16                 XmlElement xe = (XmlElement)xnf;17                 XmlNodeList xnf1 = xe.ChildNodes;18                 foreach (XmlNode xn2 in xnf1)19                 {20                     if (xn2.Name == attributeName)21                     {22                         sb.Append(xn2.InnerText);//显示子节点点文本23                     }24                 }25             }26             return sb.ToString();27         }

 1 /// <summary> 2         /// 获取节点的属性值 3         /// </summary> 4         /// <param name="path">xml路径</param> 5         /// <param name="rootNode">根节点名称</param> 6         /// <param name="attributeName">属性名称</param> 7         /// <returns></returns> 8         public string GetNodeAttribute(string path, string rootNode, string attributeName) 9         {10             try11             {12                 XmlNode xn = XmlDoc.SelectSingleNode(rootNode);13                 XmlNodeList xnl = xn.ChildNodes;14                 StringBuilder sb = new StringBuilder();15                 foreach (XmlNode xnf in xnl)16                 {17                     XmlElement xe = (XmlElement)xnf;18                     sb.Append(xe.GetAttribute(attributeName));19                 }20                 return sb.ToString();21             }22             catch (Exception)23             {24 25                 throw;26             }27         }

 1  /// <summary> 2         /// 删除节点/节点属性 3         /// </summary> 4         /// <param name="path">xml文件地址</param> 5         /// <param name="rootNode">根节点名称</param> 6         /// <param name="delNode">要删除的节点</param> 7         /// <param name="attributeName">节点属性</param> 8         /// <param name="attributeValue">属性值</param> 9         public void DeleteNode(string path, string rootNode, string attributeName, string attributeValue)10         {11             try12             {13                 XmlNodeList xnl = XmlDoc.SelectSingleNode(rootNode).ChildNodes;14                 foreach (XmlNode xn in xnl)15                 {16                     XmlElement xe = (XmlElement)xn;17                     if (xe.GetAttribute(attributeName) == attributeValue)18                     {19                         //xe.RemoveAttribute(attributeName);//删除属性20                         xe.RemoveAll();//删除该节点的全部内容21                     }22                 }23                 SaveXml(path);24             }25             catch (Exception)26             {27 28                 throw;29             }30         }

 1  /// <summary> 2         /// 修改节点的子节点内容 3         /// </summary> 4         /// <param name="path">xml文件路径</param> 5         /// <param name="rootNode">根节点名称</param> 6         /// <param name="attributeName">节点的子节点名称</param> 7         /// <param name="attributeOldValue">节点的子节点原始内容</param> 8         /// <param name="attributeNewValue">节点的子节点新内容</param> 9         public void UpdateChildNodeAttribute(string path, string rootNode, string attributeName, string attributeOldValue, string attributeNewValue)10         {11             try12             {13                 XmlNodeList nodeList = XmlDoc.SelectSingleNode(rootNode).ChildNodes;//获取根节点的所有子节点14                 foreach (XmlNode xn in nodeList)//遍历所有子节点15                 {16                     XmlElement xe = (XmlElement)xn;//将子节点类型转换为XmlElement类型17                     if (string.IsNullOrEmpty(attributeName) || string.IsNullOrEmpty(attributeOldValue))18                     {19                         return;20                     }21                     else22                     {23                         XmlNodeList nls = xe.ChildNodes;24                         if (nls != null && nls.Count > 0)25                         {26                             foreach (XmlNode xn1 in nls)//遍历27                             {28                                 XmlElement xe2 = (XmlElement)xn1;//转换类型29                                 if (xe2.InnerText == attributeOldValue)//如果找到30                                 {31                                     xe2.InnerText = attributeNewValue;//则修改32                                     break;//找到退出来就可以了33                                 }34                             }35                         }36                     }37                 }38                 SaveXml(path);39             }40             catch (Exception)41             {42 43                 throw;44             }45         }

 1 /// <summary> 2         /// 修改节点属性值操作 3         /// </summary> 4         /// <param name="path">xml文件路径</param> 5         /// <param name="rootNode">根节点名称，如：bookstore</param> 6         /// <param name="attributeName">节点属性名</param> 7         /// <param name="attributeOldValue">节点属性原来值</param> 8         /// <param name="attributeNewValue">节点属性修改后的值</param> 9         public void UpdateNodeAttribute(string path, string rootNode, string attributeName, string attributeOldValue, string attributeNewValue)10         {11             try12             {13                 XmlNodeList nodeList = XmlDoc.SelectSingleNode(rootNode).ChildNodes;//获取根节点的所有子节点14                 foreach (XmlNode xn in nodeList)//遍历所有子节点15                 {16                     XmlElement xe = (XmlElement)xn;//将子节点类型专程xmlelement类型17                     if (string.IsNullOrEmpty(attributeName) || string.IsNullOrEmpty(attributeOldValue))18                     {19                         return;20                     }21                     else22                     {23                         if (xe.GetAttribute(attributeName) == attributeOldValue)24                         {25                             xe.SetAttribute(attributeName, attributeNewValue);26                         }27                     }28                 }29                 SaveXml(path);30             }31             catch (Exception)32             {33 34                 throw;35             }36         }

 1 /// <summary> 2         /// 插入节点操作 3         /// </summary> 4         /// <param name="path">xml文件路径</param> 5         /// <param name="rootN