XML怎么创建

Question

怎么能创建一个Xml文档，急

Answer 1

/// <summary>
        /// 生产一个XML文件
        /// </summary>
        /// <param name="xmlFilePath">XML文件名</param>
        /// <param name="StartElement">根元素名</param>
        private void CreateXMLFile(string xmlFilePath, string StartElement)
        {
            XmlTextWriter writer = new XmlTextWriter(xmlFilePath, Encoding.UTF8);
            writer.WriteStartDocument();
            writer.WriteStartElement(StartElement);
            writer.WriteEndElement();
            writer.WriteEndDocument();
            writer.Close();
        }        /// <summary>
        /// 向XML文件中增加一个新的元素,属性,值
        /// </summary>
        /// <param name="xmlpath">XML文件名</param>
        /// <param name="element">元素名</param>
        /// <param name="attribut">属性名</param>
        /// <param name="value">值</param>
        /// <returns></returns>
        public bool addXmlElement(string xmlpath, string element, string attribute, string value)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(xmlpath);
                XmlNode node = doc.SelectSingleNode("//" + element);
                if (node == null)
                {
                    XmlElement xElement = doc.CreateElement(element);
                    xElement.SetAttribute(attribute, value);
                    doc.DocumentElement.AppendChild(xElement);
                }
                else
                {
                    try
                    {
                        if (node.Attributes[attribute] == null)
                        {
                            XmlAttribute newAttr = doc.CreateAttribute(attribute);
                            newAttr.Value = value;
                            node.Attributes.Append(newAttr);
                        }
                        else
                        {
                            string attributesvalue = node.Attributes[attribute].Value;
                            if (attributesvalue != null || attributesvalue != "")
                            {
                                node.Attributes[attribute].Value = value;
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        XmlAttribute newAttr = doc.CreateAttribute(attribute);
                        newAttr.Value = value;
                        node.Attributes.Append(newAttr);
                    }
                }
                doc.Save(xmlpath);
                return true;
            }
            catch (Exception e)
            {
                return false;
            }
        }        /// <summary>
        /// 更新XML文件中某个元素的属性值
        /// </summary>
        /// <param name="xmlpath">XML文件名</param>
        /// <param name="element">元素名</param>
        /// <param name="attribut">属性名</param>
        /// <param name="value">值</param>
        /// <returns></returns>
        public bool updateValue(string xmlpath, string element, string attribute, string value)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(xmlpath);
                XmlNode node = doc.SelectSingleNode("//" + element);
                node.Attributes[attribute].Value = value;
                doc.Save(xmlpath);
                return true;
            }
            catch (Exception ex)
            {
                if (addXmlElement(xmlpath, element, attribute, value))
                    return true;
                else
                    return false;
            }
        }        /// <summary>
        /// 从XML文件中读取某个元素的属性值
        /// </summary>
        /// <param name="xmlpath">XML文件名</param>
        /// <param name="element">元素名</param>
        /// <param name="attribut">属性名</param>
        /// <param name="value">值</param>
        /// <returns></returns>
        public string readValue(string xmlpath, string element, string attribute, string value)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(xmlpath);
                XmlNode node = doc.SelectSingleNode("//" + element);
                if (node.Attributes[attribute].Value.ToString() != "")
                {
                    value = node.Attributes[attribute].Value;
                }
                else
                {
                    addXmlElement(xmlpath, element, attribute, value);
                }
                return value;
            }
            catch (Exception ex)
            {
                if (addXmlElement(xmlpath, element, attribute, value))
                    return value;
                else
                    return "";
            }
        }