C#操作XML的封装类

XML文件读写类

public class XmlControl
{
protected string strXmlFile;
protected XmlDocument objXmlDoc = new XmlDocument();

public XmlControl(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 DataView 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].DefaultView;
}

public void Replace(string XmlPathNode,string Content)
{
//更新节点内容。
objXmlDoc.SelectSingleNode(XmlPathNode).InnerText = Content;
}

public void Delete(string Node)
{
//删除一个节点。
string mainNode = Node.Substring(0,Node.LastIndexOf("/"));
objXmlDoc.SelectSingleNode(mainNode).RemoveChild(objXmlDoc.SelectSingleNode(Node));
}

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);
}

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);
}

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);
}

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();

XML与Dataset相互转换类

    class XmlDatasetConvert
    {
        //将xml对象内容字符串转换为DataSet
        public static DataSet ConvertXMLToDataSet(string xmlData)
        {
            StringReader stream = null;
            XmlTextReader reader = null;
            try
            {
                DataSet xmlDS = new DataSet();
                stream = new StringReader(xmlData);
                //从stream装载到XmlTextReader
                reader = new XmlTextReader(stream);
                xmlDS.ReadXml(reader);
                return xmlDS;
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (reader != null) reader.Close();
            }
        }

        //将xml文件转换为DataSet
        public static DataSet ConvertXMLFileToDataSet(string xmlFile)
        {
            StringReader stream = null;
            XmlTextReader reader = null;
            try
            {
                XmlDocument xmld = new XmlDocument();
                xmld.Load(xmlFile);

                DataSet xmlDS = new DataSet();
                stream = new StringReader(xmld.InnerXml);
                //从stream装载到XmlTextReader
                reader = new XmlTextReader(stream);
                xmlDS.ReadXml(reader);
                //xmlDS.ReadXml(xmlFile);
                return xmlDS;
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (reader != null) reader.Close();
            }
        }

        //将DataSet转换为xml对象字符串
        public static string ConvertDataSetToXML(DataSet xmlDS)
        {
            MemoryStream stream = null;
            XmlTextWriter writer = null;

            try
            {
                stream = new MemoryStream();
                //从stream装载到XmlTextReader
                writer = new XmlTextWriter(stream, Encoding.Unicode);

                //用WriteXml方法写入文件.
                xmlDS.WriteXml(writer);
                int count = (int)stream.Length;
                byte[] arr = new byte[count];
                stream.Seek(0, SeekOrigin.Begin);
                stream.Read(arr, 0, count);

                UnicodeEncoding utf = new UnicodeEncoding();
                return utf.GetString(arr).Trim();
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (writer != null) writer.Close();
            }
        }

        //将DataSet转换为xml文件
        public static void ConvertDataSetToXMLFile(DataSet xmlDS,string xmlFile)
        {
            MemoryStream stream = null;
            XmlTextWriter writer = null;

            try
            {
                stream = new MemoryStream();
                //从stream装载到XmlTextReader
                writer = new XmlTextWriter(stream, Encoding.Unicode);

                //用WriteXml方法写入文件.
                xmlDS.WriteXml(writer);
                int count = (int)stream.Length;
                byte[] arr = new byte[count];
                stream.Seek(0, SeekOrigin.Begin);
                stream.Read(arr, 0, count);

                //返回Unicode编码的文本
                UnicodeEncoding utf = new UnicodeEncoding();
                StreamWriter sw = new StreamWriter(xmlFile);
                sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
                sw.WriteLine(utf.GetString(arr).Trim());
                sw.Close();
            }
            catch( System.Exception ex )
            {
                throw ex;
            }
            finally
            {
                if (writer != null) writer.Close();
            }
        }

    }