xml使用系統整理

1、 認識xml

可擴展標記語言，一種用于標記電子文檔使其具有結果性的標記語言，它可以用來標記數據、定義數據類型，是一種允許用戶對自己的標記語言進行定義的源語言。

2、 和超文本標記語言區別

2.1 html不一定需要成對出現，xml則一定需要成對出現。

2.2 html 不區分大小寫，但是xml區分。

3、對xml文檔增刪改查

 1  //聲明一個XmlDocument空對象 2         PRotected XmlDocument XmlDoc = new XmlDocument(); 3         /// <summary> 4         /// 構造函數，導入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         /// 獲取節點的子節點的內容 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);//顯示子節點點文本23                     }24                 }25             }26             return sb.ToString();27         }

 1 /// <summary> 2         /// 獲取節點的屬性值 3         /// </summary> 4         /// <param name="path">xml路徑</param> 5         /// <param name="rootNode">根節點名稱</param> 6         /// <param name="attributeName">屬性名稱</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         /// 刪除節點/節點屬性 3         /// </summary> 4         /// <param name="path">xml文件地址</param> 5         /// <param name="rootNode">根節點名稱</param> 6         /// <param name="delNode">要刪除的節點</param> 7         /// <param name="attributeName">節點屬性</param> 8         /// <param name="attributeValue">屬性值</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);//刪除屬性20                         xe.RemoveAll();//刪除該節點的全部內容21                     }22                 }23                 SaveXml(path);24             }25             catch (Exception)26             {27 28                 throw;29             }30         }

 1  /// <summary> 2         /// 修改節點的子節點內容 3         /// </summary> 4         /// <param name="path">xml文件路徑</param> 5         /// <param name="rootNode">根節點名稱</param> 6         /// <param name="attributeName">節點的子節點名稱</param> 7         /// <param name="attributeOldValue">節點的子節點原始內容</param> 8         /// <param name="attributeNewValue">節點的子節點新內容</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;//獲取根節點的所有子節點14                 foreach (XmlNode xn in nodeList)//遍歷所有子節點15                 {16                     XmlElement xe = (XmlElement)xn;//將子節點類型轉換為XmlElement類型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)//遍歷27                             {28                                 XmlElement xe2 = (XmlElement)xn1;//轉換類型29                                 if (xe2.InnerText == attributeOldValue)//如果找到30                                 {31                                     xe2.InnerText = attributeNewValue;//則修改32                                     break;//找到退出來就可以了33                                 }34                             }35                         }36                     }37                 }38                 SaveXml(path);39             }40             catch (Exception)41             {42 43                 throw;44             }45         }

 1 /// <summary> 2         /// 修改節點屬性值操作 3         /// </summary> 4         /// <param name="path">xml文件路徑</param> 5         /// <param name="rootNode">根節點名稱，如：bookstore</param> 6         /// <param name="attributeName">節點屬性名</param> 7         /// <param name="attributeOldValue">節點屬性原來值</param> 8         /// <param name="attributeNewValue">節點屬性修改后的值</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;//獲取根節點的所有子節點14                 foreach (XmlNode xn in nodeList)//遍歷所有子節點15                 {16                     XmlElement xe = (XmlElement)xn;//將子節點類型專程xmlelement類型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         /// 插入節點操作 3         /// </summary> 4         /// <param name="path">xml文件路徑</param> 5         /// <param name="rootN