C#操作XML通用方法匯總_C#教程

 在.net的項目開發中，經常會對XML檔案進行操作，由於XML檔案可以實現跨平台傳輸，較多的應用在資料轉送中，特總結以下幾種常用的XML操作方法：

1.建立XML文檔：

  /// <summary>  /// 建立XML文檔  /// </summary>  /// <param name="name">根節點名稱</param>  /// <param name="type">根節點的一個屬性值</param>  /// <returns>XmlDocument對象</returns>    public static XmlDocument CreateXmlDocument(string name, string type)  {   XmlDocument doc;   try   {    doc = new XmlDocument();    doc.LoadXml("<" + name + "/>");    var rootEle = doc.DocumentElement;    rootEle?.SetAttribute("type", type);   }   catch (Exception er)   {    throw new Exception(er.ToString());   }   return doc;  }

2.讀取XML文檔中的資料：

  /// <summary>  /// 讀取資料  /// </summary>  /// <param name="path">路徑</param>  /// <param name="node">節點</param>  /// <param name="attribute">屬性名稱，非空時返回該屬性值，否則返回串聯值</param>  /// <returns>string</returns>  public static string Read(string path, string node, string attribute)  {   var value = "";   try   {    var doc = new XmlDocument();    doc.Load(path);    var xn = doc.SelectSingleNode(node);    if (xn != null && xn.Attributes != null)     value = (attribute.Equals("") ? xn.InnerText : xn.Attributes[attribute].Value);   }   catch (Exception er)   {    throw new Exception(er.ToString());   }   return value;  }

3.對XML文檔插入資料：

  /// <summary>  /// 插入資料  /// </summary>  /// <param name="path">路徑</param>  /// <param name="node">節點</param>  /// <param name="element">元素名，非空時插入新元素，否則在該元素中插入屬性</param>  /// <param name="attribute">屬性名稱，非空時插入該元素屬性值，否則插入元素值</param>  /// <param name="value">值</param>  /// <returns></returns>  public static void Insert(string path, string node, string element, string attribute, string value)  {   try   {    var doc = new XmlDocument();    doc.Load(path);    var xn = doc.SelectSingleNode(node);    if (element.Equals(""))    {     if (!attribute.Equals(""))     {      var xe = (XmlElement)xn;      xe?.SetAttribute(attribute, value);      //xe?.SetAttribute(attribute, value);     }    }    else    {     var xe = doc.CreateElement(element);     if (attribute.Equals(""))      xe.InnerText = value;     else      xe.SetAttribute(attribute, value);     xn?.AppendChild(xe);    }    doc.Save(path);   }   catch (Exception er)   {    throw new Exception(er.ToString());   }  }

4.修改XML文檔中的資料：

  /// <summary>  /// 修改資料  /// </summary>  /// <param name="path">路徑</param>  /// <param name="node">節點</param>  /// <param name="attribute">屬性名稱，非空時修改該節點屬性值，否則修改節點值</param>  /// <param name="value">值</param>  /// <returns></returns>  public static void Update(string path, string node, string attribute, string value)  {   try   {    var doc = new XmlDocument();    doc.Load(path);    var xn = doc.SelectSingleNode(node);    var xe = (XmlElement)xn;    if (attribute.Equals(""))    {     if (xe != null) xe.InnerText = value;    }    else    {     xe?.SetAttribute(attribute, value);    }    doc.Save(path);   }   catch (Exception er)   {    throw new Exception(er.ToString());   }  }

5.刪除XML文檔中資料：

  /// <summary>  /// 刪除資料  /// </summary>  /// <param name="path">路徑</param>  /// <param name="node">節點</param>  /// <param name="attribute">屬性名稱，非空時刪除該節點屬性值，否則刪除節點值</param>  /// <returns></returns>  public static void Delete(string path, string node, string attribute)  {   try   {    var doc = new XmlDocument();    doc.Load(path);    var xn = doc.SelectSingleNode(node);    var xe = (XmlElement)xn;    if (attribute.Equals(""))    {     xn?.ParentNode?.RemoveChild(xn);    }    else    {     xe?.RemoveAttribute(attribute);    }    doc.Save(path);   }   catch (Exception er)   {    throw new Exception(er.ToString());   }  }

6.讀取XML文檔中指定節點資料：

  /// <summary>  /// 獲得xml檔案中指定節點的節點資料  /// </summary>  /// <param name="path"></param>  /// <param name="nodeName"></param>  /// <returns></returns>  public static string GetNodeInfoByNodeName(string path, string nodeName)  {   var xmlString = string.Empty;   try   {    var xml = new XmlDocument();    xml.Load(path);    var root = xml.DocumentElement;    if (root == null) return xmlString;    var node = root.SelectSingleNode("//" + nodeName);    if (node != null)    {     xmlString = node.InnerText;    }   }   catch (Exception er)   {    throw new Exception(er.ToString());   }   return xmlString;  }

7.擷取XML指定節點的屬性：

  /// <summary>   /// 功能:讀取指定節點的指定屬性值    /// </summary>  /// <param name="path"></param>  /// <param name="strNode">節點名稱</param>   /// <param name="strAttribute">此節點的屬性</param>   /// <returns></returns>   public string GetXmlNodeAttributeValue(string path, string strNode, string strAttribute)  {   var strReturn = "";   try   {    var xml = new XmlDocument();    xml.Load(path);    //根據指定路徑擷取節點     var xmlNode = xml.SelectSingleNode(strNode);    if (xmlNode != null)    {     //擷取節點的屬性，並迴圈取出需要的屬性值      var xmlAttr = xmlNode.Attributes;     if (xmlAttr == null) return strReturn;     for (var i = 0; i < xmlAttr.Count; i++)     {      if (xmlAttr.Item(i).Name != strAttribute) continue;      strReturn = xmlAttr.Item(i).Value;      break;     }    }   }   catch (XmlException xmle)   {    throw new Exception(xmle.Message);   }   return strReturn;  }

8.設定XML文檔中指定節點的屬性：

 /// <summary>   /// 功能:設定節點的屬性值    /// </summary>  /// <param name="path"></param>  /// <param name="xmlNodePath">節點名稱</param>   /// <param name="xmlNodeAttribute">屬性名稱</param>   /// <param name="xmlNodeAttributeValue">屬性值</param>   public void SetXmlNodeAttributeValue(string path, string xmlNodePath, string xmlNodeAttribute, string xmlNodeAttributeValue)  {   try   {    var xml = new XmlDocument();    xml.Load(path);    //可以批量為合格節點的屬性付值     var xmlNode = xml.SelectNodes(xmlNodePath);    if (xmlNode == null) return;    foreach (var xmlAttr in from XmlNode xn in xmlNode select xn.Attributes)    {     if (xmlAttr == null) return;     for (var i = 0; i < xmlAttr.Count; i++)     {      if (xmlAttr.Item(i).Name != xmlNodeAttribute) continue;      xmlAttr.Item(i).Value = xmlNodeAttributeValue;      break;     }    }   }   catch (XmlException xmle)   {    throw new Exception(xmle.Message);   }  }

9.讀取XML文檔指定節點的值：

  /// <summary>  /// 讀取XML資源中的指定節點內容  /// </summary>  /// <param name="source">XML資源</param>  /// <param name="xmlType">XML資源類型：檔案，字串</param>  /// <param name="nodeName">節點名稱</param>  /// <returns>節點內容</returns>  public static object GetNodeValue(string source, XmlType xmlType, string nodeName)  {   var xd = new XmlDocument();   if (xmlType == XmlType.File)   {    xd.Load(source);   }   else   {    xd.LoadXml(source);   }   var xe = xd.DocumentElement;   XmlNode xn = null;   if (xe != null)   {     xn= xe.SelectSingleNode("//" + nodeName);       }   return xn.InnerText;  }

10.更新XML文檔指定節點的內容：

  /// <summary>  /// 更新XML檔案中的指定節點內容  /// </summary>  /// <param name="filePath">檔案路徑</param>  /// <param name="nodeName">節點名稱</param>  /// <param name="nodeValue">更新內容</param>  /// <returns>更新是否成功</returns>  public static bool UpdateNode(string filePath, string nodeName, string nodeValue)  {      try   {    bool flag;    var xd = new XmlDocument();    xd.Load(filePath);    var xe = xd.DocumentElement;    if (xe == null) return false;    var xn = xe.SelectSingleNode("//" + nodeName);    if (xn != null)    {     xn.InnerText = nodeValue;     flag = true;    }    else    {     flag = false;    }    return flag;   }   catch (Exception ex)   {    throw new Exception(ex.Message);   }     }複製代碼11.將對象轉化為XML檔案，並存入指定目錄：複製代碼  /// <summary>  /// 將對象轉化為xml，並寫入指定路徑的xml檔案中  /// </summary>  /// <typeparam name="T">C#對象名</typeparam>  /// <param name="item">對象執行個體</param>  /// <param name="path">路徑</param>  /// <param name="jjdbh">標號</param>  /// <param name="ends">結束符號（整個xml的路徑類似如下：C:\xmltest\201111send.xml，其中path=C:\xmltest,jjdbh=201111,ends=send）</param>  /// <returns></returns>  public static string WriteXml<T>(T item, string path, string jjdbh, string ends)  {   if (string.IsNullOrEmpty(ends))   {    //預設為發送    ends = "send";   }   //控制寫入檔案的次數   var i = 0;   //擷取當前對象的類型，也可以使用反射typeof(對象名)   var serializer = new XmlSerializer(item.GetType());   //xml的路徑組合   object[] obj = { path, "\\", jjdbh, ends, ".xml" };   var xmlPath = string.Concat(obj);   while (true)   {    try    {     //用filestream方式建立檔案不會出現“檔案正在佔用中，用File.create”則不行     var fs = System.IO.File.Create(xmlPath);     fs.Close();     TextWriter writer = new StreamWriter(xmlPath, false, Encoding.UTF8);     var xml = new XmlSerializerNamespaces();     xml.Add(string.Empty, string.Empty);     serializer.Serialize(writer, item, xml);     writer.Flush();     writer.Close();     break;    }    catch (Exception)    {     if (i < 5)     {      i++;      continue;     }     break;    }   }   return SerializeToXmlStr<T>(item, true);  }

12.向一個已經存在的父節點中插入一個子節點：

  /// <summary>   /// 向一個已經存在的父節點中插入一個子節點   /// </summary>  /// <param name="path"></param>  /// <param name="parentNodePath">父節點</param>  /// <param name="childnodename">子節點名稱</param>   public void AddChildNode(string path, string parentNodePath, string childnodename)  {   try   {    var xml = new XmlDocument();    xml.Load(path);    var parentXmlNode = xml.SelectSingleNode(parentNodePath);    XmlNode childXmlNode = xml.CreateElement(childnodename);    if ((parentXmlNode) != null)    {     //如果此節點存在      parentXmlNode.AppendChild(childXmlNode);    }    else    {     //如果不存在就放父節點添加      GetXmlRoot(path).AppendChild(childXmlNode);    }   }   catch (XmlException xmle)   {    throw new Exception(xmle.Message);   }  }

以上的方法總結採用.net4.5版本和c#6.0文法，希望對大家的學習有所協助，也希望大家多多支援雲棲社區。