C#中对 XML节点进行增、删、改、查

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

using System.Xml;

namespace WebApplication2
{


    
/// <summary>
    
/// XMLHelper XML文档操作管理器
    
/// </summary>
    public class XMLHelper
    {
        
public XMLHelper()
        {
            
//
            
// TODO: 在此处添加构造函数逻辑
            
//
        }


        
#region XML文档节点查询和读取
        
/// <summary>
        
/// 选择匹配XPath表达式的第一个节点XmlNode.
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名")</param>
        
/// <returns>返回XmlNode</returns>
        public static XmlNode GetXmlNodeByXpath(string xmlFileName, string xpath)
        {
            XmlDocument xmlDoc 
= new XmlDocument();
            
try
            {
                xmlDoc.Load(xmlFileName); 
//加载XML文档
                XmlNode xmlNode = xmlDoc.SelectSingleNode(xpath);
                
return xmlNode;
            }
            
catch (Exception ex)
            {
                
return null;
                
//throw ex; //这里可以定义你自己的异常处理
            }
        }

        
/// <summary>
        
/// 选择匹配XPath表达式的节点列表XmlNodeList.
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名")</param>
        
/// <returns>返回XmlNodeList</returns>
        public static XmlNodeList GetXmlNodeListByXpath(string xmlFileName, string xpath)
        {
            XmlDocument xmlDoc 
= new XmlDocument();

            
try
            {
                xmlDoc.Load(xmlFileName); 
//加载XML文档
                XmlNodeList xmlNodeList = xmlDoc.SelectNodes(xpath);
                
return xmlNodeList;
            }
            
catch (Exception ex)
            {
                
return null;
                
//throw ex; //这里可以定义你自己的异常处理
            }
        }

        
/// <summary>
        
/// 选择匹配XPath表达式的第一个节点的匹配xmlAttributeName的属性XmlAttribute.
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
        
/// <param name="xmlAttributeName">要匹配xmlAttributeName的属性名称</param>
        
/// <returns>返回xmlAttributeName</returns>
        public static XmlAttribute GetXmlAttribute(string xmlFileName, string xpath, string xmlAttributeName)
        {
            
string content = string.Empty;
            XmlDocument xmlDoc 
= new XmlDocument();
            XmlAttribute xmlAttribute 
= null;
            
try
            {
                xmlDoc.Load(xmlFileName); 
//加载XML文档
                XmlNode xmlNode = xmlDoc.SelectSingleNode(xpath);
                
if (xmlNode != null)
                {
                    
if (xmlNode.Attributes.Count > 0)
                    {
                        xmlAttribute 
= xmlNode.Attributes[xmlAttributeName];
                    }
                }
            }
            
catch (Exception ex)
            {
                
throw ex; //这里可以定义你自己的异常处理
            }
            
return xmlAttribute;
        }
        
#endregion

        
#region XML文档创建和节点或属性的添加、修改
        
/// <summary>
        
/// 创建一个XML文档
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="rootNodeName">XML文档根节点名称(须指定一个根节点名称)</param>
        
/// <param name="version">XML文档版本号(必须为:"1.0")</param>
        
/// <param name="encoding">XML文档编码方式</param>
        
/// <param name="standalone">该值必须是"yes"或"no",如果为null,Save方法不在XML声明上写出独立属性</param>
        
/// <returns>成功返回true,失败返回false</returns>
        public static bool CreateXmlDocument(string xmlFileName, string rootNodeName, string version, string encoding, string standalone)
        {
            
bool isSuccess = false;
            
try
            {
                XmlDocument xmlDoc 
= new XmlDocument();
                XmlDeclaration xmlDeclaration 
= xmlDoc.CreateXmlDeclaration(version, encoding, standalone);
                XmlNode root 
= xmlDoc.CreateElement(rootNodeName);
                xmlDoc.AppendChild(xmlDeclaration);
                xmlDoc.AppendChild(root);
                xmlDoc.Save(xmlFileName);
                isSuccess 
= true;
            }
            
catch (Exception ex)
            {
                
throw ex; //这里可以定义你自己的异常处理
            }
            
return isSuccess;
        }

        
/// <summary>
        
/// 依据匹配XPath表达式的第一个节点来创建它的子节点(如果此节点已存在则追加一个新的同名节点
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
        
/// <param name="xmlNodeName">要匹配xmlNodeName的节点名称</param>
        
/// <param name="innerText">节点文本值</param>
        
/// <param name="xmlAttributeName">要匹配xmlAttributeName的属性名称</param>
        
/// <param name="value">属性值</param>
        
/// <returns>成功返回true,失败返回false</returns>
        public static bool CreateXmlNodeByXPath(string xmlFileName, string xpath, string xmlNodeName, string innerText, string xmlAttributeName, string value)
        {
            
bool isSuccess = false;
            XmlDocument xmlDoc 
= new XmlDocument();
            
try
            {
                xmlDoc.Load(xmlFileName); 
//加载XML文档
                XmlNode xmlNode = xmlDoc.SelectSingleNode(xpath);
                
if (xmlNode != null)
                {
                    
//存不存在此节点都创建
                    XmlElement subElement = xmlDoc.CreateElement(xmlNodeName);
                    subElement.InnerXml 
= innerText;

                    
//如果属性和值参数都不为空则在此新节点上新增属性
                    if (!string.IsNullOrEmpty(xmlAttributeName) && !string.IsNullOrEmpty(value))
                    {
                        XmlAttribute xmlAttribute 
= xmlDoc.CreateAttribute(xmlAttributeName);
                        xmlAttribute.Value 
= value;
                        subElement.Attributes.Append(xmlAttribute);
                    }

                    xmlNode.AppendChild(subElement);
                }
                xmlDoc.Save(xmlFileName); 
//保存到XML文档
                isSuccess = true;
            }
            
catch (Exception ex)
            {
                
throw ex; //这里可以定义你自己的异常处理
            }
            
return isSuccess;
        }

        
/// <summary>
        
/// 依据匹配XPath表达式的第一个节点来创建或更新它的子节点(如果节点存在则更新,不存在则创建)
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
        
/// <param name="xmlNodeName">要匹配xmlNodeName的节点名称</param>
        
/// <param name="innerText">节点文本值</param>
        
/// <returns>成功返回true,失败返回false</returns>
        public static bool CreateOrUpdateXmlNodeByXPath(string xmlFileName, string xpath, string xmlNodeName, string innerText)
        {
            
bool isSuccess = false;
            
bool isExistsNode = false;//标识节点是否存在
            XmlDocument xmlDoc = new XmlDocument();
            
try
            {
                xmlDoc.Load(xmlFileName); 
//加载XML文档
                XmlNode xmlNode = xmlDoc.SelectSingleNode(xpath);
                
if (xmlNode != null)
                {
                    
//遍历xpath节点下的所有子节点
                    foreach (XmlNode node in xmlNode.ChildNodes)
                    {
                        
if (node.Name.ToLower() == xmlNodeName.ToLower())
                        {
                            
//存在此节点则更新
                            node.InnerXml = innerText;
                            isExistsNode 
= true;
                            
break;
                        }
                    }
                    
if (!isExistsNode)
                    {
                        
//不存在此节点则创建
                        XmlElement subElement = xmlDoc.CreateElement(xmlNodeName);
                        subElement.InnerXml 
= innerText;
                        xmlNode.AppendChild(subElement);
                    }
                }
                xmlDoc.Save(xmlFileName); 
//保存到XML文档
                isSuccess = true;
            }
            
catch (Exception ex)
            {
                
throw ex; //这里可以定义你自己的异常处理
            }
            
return isSuccess;
        }

        
/// <summary>
        
/// 依据匹配XPath表达式的第一个节点来创建或更新它的属性(如果属性存在则更新,不存在则创建)
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
        
/// <param name="xmlAttributeName">要匹配xmlAttributeName的属性名称</param>
        
/// <param name="value">属性值</param>
        
/// <returns>成功返回true,失败返回false</returns>
        public static bool CreateOrUpdateXmlAttributeByXPath(string xmlFileName, string xpath, string xmlAttributeName, string value)
        {
            
bool isSuccess = false;
            
bool isExistsAttribute = false;//标识属性是否存在
            XmlDocument xmlDoc = new XmlDocument();
            
try
            {
                xmlDoc.Load(xmlFileName); 
//加载XML文档
                XmlNode xmlNode = xmlDoc.SelectSingleNode(xpath);
                
if (xmlNode != null)
                {
                    
//遍历xpath节点中的所有属性
                    foreach (XmlAttribute attribute in xmlNode.Attributes)
                    {
                        
if (attribute.Name.ToLower() == xmlAttributeName.ToLower())
                        {
                            
//节点中存在此属性则更新
                            attribute.Value = value;
                            isExistsAttribute 
= true;
                            
break;
                        }
                    }
                    
if (!isExistsAttribute)
                    {
                        
//节点中不存在此属性则创建
                        XmlAttribute xmlAttribute = xmlDoc.CreateAttribute(xmlAttributeName);
                        xmlAttribute.Value 
= value;
                        xmlNode.Attributes.Append(xmlAttribute);
                    }
                }
                xmlDoc.Save(xmlFileName); 
//保存到XML文档
                isSuccess = true;
            }
            
catch (Exception ex)
            {
                
throw ex; //这里可以定义你自己的异常处理
            }
            
return isSuccess;
        }
        
#endregion


        
#region XML文档节点或属性的删除
        
/// <summary>
        
/// 删除匹配XPath表达式的第一个节点(节点中的子元素同时会被删除)
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
        
/// <returns>成功返回true,失败返回false</returns>
        public static bool DeleteXmlNodeByXPath(string xmlFileName, string xpath)
        {
            
bool isSuccess = false;
            XmlDocument xmlDoc 
= new XmlDocument();
            
try
            {
                xmlDoc.Load(xmlFileName); 
//加载XML文档
                XmlNode xmlNode = xmlDoc.SelectSingleNode(xpath);
                
if (xmlNode != null)
                {
                    
//删除节点
                    xmlNode.ParentNode.RemoveChild(xmlNode);
                }
                xmlDoc.Save(xmlFileName); 
//保存到XML文档
                isSuccess = true;
            }
            
catch (Exception ex)
            {
                
throw ex; //这里可以定义你自己的异常处理
            }
            
return isSuccess;
        }

        
/// <summary>
        
/// 删除匹配XPath表达式的第一个节点中的匹配参数xmlAttributeName的属性
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
        
/// <param name="xmlAttributeName">要删除的xmlAttributeName的属性名称</param>
        
/// <returns>成功返回true,失败返回false</returns>
        public static bool DeleteXmlAttributeByXPath(string xmlFileName, string xpath, string xmlAttributeName)
        {
            
bool isSuccess = false;
            
bool isExistsAttribute = false;
            XmlDocument xmlDoc 
= new XmlDocument();
            
try
            {
                xmlDoc.Load(xmlFileName); 
//加载XML文档
                XmlNode xmlNode = xmlDoc.SelectSingleNode(xpath);
                XmlAttribute xmlAttribute 
= null;
                
if (xmlNode != null)
                {
                    
//遍历xpath节点中的所有属性
                    foreach (XmlAttribute attribute in xmlNode.Attributes)
                    {
                        
if (attribute.Name.ToLower() == xmlAttributeName.ToLower())
                        {
                            
//节点中存在此属性
                            xmlAttribute = attribute;
                            isExistsAttribute 
= true;
                            
break;
                        }
                    }
                    
if (isExistsAttribute)
                    {
                        
//删除节点中的属性
                        xmlNode.Attributes.Remove(xmlAttribute);
                    }
                }
                xmlDoc.Save(xmlFileName); 
//保存到XML文档
                isSuccess = true;
            }
            
catch (Exception ex)
            {
                
throw ex; //这里可以定义你自己的异常处理
            }
            
return isSuccess;
        }

        
/// <summary>
        
/// 删除匹配XPath表达式的第一个节点中的所有属性
        
/// </summary>
        
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
        
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
        
/// <returns>成功返回true,失败返回false</returns>
        public static bool DeleteAllXmlAttributeByXPath(string xmlFileName, string xpath)
        {
            
bool isSuccess = false;
            XmlDocument xmlDoc 
= new XmlDocument();
            
try
            {
                xmlDoc.Load(xmlFileName); 
//加载XML文档
                XmlNode xmlNode = xmlDoc.SelectSingleNode(xpath);
                
if (xmlNode != null)
                {
                    
//遍历xpath节点中的所有属性
                    xmlNode.Attributes.RemoveAll();
                }
                xmlDoc.Save(xmlFileName); 
//保存到XML文档
                isSuccess = true;
            }
            
catch (Exception ex)
            {
                
throw ex; //这里可以定义你自己的异常处理
            }
            
return isSuccess;
        }
        
#endregion

    }
}

引用:http://www.cnblogs.com/chnboy/archive/2009/04/02/1427652.html

posted @ 2007-09-27 10:24 peak 阅读(...) 评论(...) 编辑 收藏