【.NET】XML文件的创建，修改，删除

类名：XML

/// 1.创建XML文档
/// 2.在根节点下增加子元素
/// 3.在元素下增加子元素
/// 4.获取类型为制定值的一组节点
/// 5.抓取网页上的xml文档赋值给XmlDocument对象
/// 6.获取服务器上指定文件的xml文件内容
/// 7.读取xml直接返回DataSet 
/// 8.读取Xml返回一个经排序或筛选后的DataView 
/// 9.向Xml文件插入一行数据 
/// 10.更行符合条件的一条Xml记录 
/// 11.通过删除DataSet中iDeleteRow这一行,然后重写Xml以实现删除指定行 
/// 12.删除strColumn列中值为ColumnValue的行 
/// 13.删除所有行 
/// 14.返回完整路径 
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.IO;
using System.Data;
using System.Data.SqlClient;
using System.Net;

namespace Tools
{
    class XML
    {
        /// <summary>
        /// 创建XML文档
        /// </summary>
        /// <param name="name">根节点名称</param>
        /// <param name="type">根节点的一个属性值</param>
        /// <returns></returns>
        /// moss中调用方法：创建的文件如果要存到moss的文档库中,则：
        ///          XmlDocument doc = XmlOperate.CreateXmlDocument("project", "T");
        ///            在此可嵌入增加子节点方法,如AddTaskNode(taskObj, ref doc); ..
        ///          byte[] fileContent = Encoding.UTF8.GetBytes(doc.OuterXml);
        ///          folder.Files.Add("name.xml", fileContent, true);
        ///          web.Update();
        /// .net中调用方法：写入文件中,则：
        ///          document = XmlOperate.CreateXmlDocument("sex", "sexy");
        ///          document.Save("c:/bookstore.xml");         
        public static XmlDocument CreateXmlDocument(string name, string type)
        {
            XmlDocument doc = null;
            XmlElement rootEle = null;
            try
            {
                doc = new XmlDocument();
                doc.LoadXml("<" + name + "/>");
                rootEle = doc.DocumentElement;
                rootEle.SetAttribute("type", type);
            }
            catch (Exception er)
            {
                throw er;
            }
            return doc;
        }

        /// <summary>
        /// 在根节点下增加子元素
        /// </summary>
        /// <param name="document"></param>
        /// <param name="nodeName"></param>
        /// <param name="type"></param>
        /// 调用方法：
        ///      document = xmloper.CreateXmlDocument("animal", "carnivore");
        ///      XmlOperate.AddNewNode1(ref document, "carnivore", "high");
        public static void AddNewNode1(ref XmlDocument document, string nodeName, string type)
        {
            XmlElement taskEle = null;
            try
            {
                taskEle = document.CreateElement(nodeName);
                taskEle.SetAttribute("type", type);
                document.DocumentElement.AppendChild((XmlNode)taskEle);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 在元素下增加子元素
        /// </summary>
        /// <param name="element"></param>
        /// <param name="nodeName"></param>
        /// <param name="type"></param>
        /// 调用方法：
        ///       XmlDocument document = new XmlDocument();
        ///       先取到相应的元素,然后调用该方法在该元素下增加子元素
        ///       XmlElement root = (XmlElement)document.SelectSingleNode("//animal/third");
        ///       XmlOperate.AddNewNode2(ref root,"thaw","boost investor confidence");
        ///注意上面的"//animal/third"也可换成"workflow[@type='T' and @isSpecial='1']"这种形式用来获取带有相应属性的元素
        public static void AddNewNode2(ref XmlElement element, string nodeName, string type)
        {
            XmlElement taskEle = null;
            try
            {
                taskEle = element.OwnerDocument.CreateElement(nodeName);
                taskEle.SetAttribute("type", type);
                element.AppendChild((XmlNode)taskEle);
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }

        /// <summary>
        /// 获取类型为制定值的一组节点
        /// </summary>
        /// <param name="type">类型值。E.G.workflow[@type='T' and @isSpecial='1']</param>
        /// <returns></returns>
        /// 注意：返回的 XmlNodeList 类型是个类似于arraylist的类型,所以要得到它的值只能遍历
        public static XmlNodeList GetDesiredNode(string type)
        {
            XmlDocument document = new XmlDocument();
            return document.SelectNodes("type");
        }


        /// <summary>
        /// 抓取网页上的xml文档赋值给XmlDocument对象
        /// </summary>
        /// <param name="url">网页的url（网页的内容必须是xml格式的）</param>
        /// <returns></returns>
        public static XmlDocument GetXMLDocumentFromWebPage(string url)
        {
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);

            myRequest.Method = "POST";
            myRequest.ContentType = "application/x-www-form-urlencoded";
            myRequest.ContentLength = 0;

            // Get response 
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.Default);
            string content = reader.ReadToEnd();

            XmlDocument document = new XmlDocument();
            document.LoadXml(content);
            return document;
        }

        /// <summary>
        /// 获取服务器上指定文件的xml文件内容
        /// </summary>
        /// <param name="location"></param>
        /// <returns></returns>
        public static string GetXMLFile(string location)
        {
            XmlDocument document = new XmlDocument();
            document.Load(@"G:	tt.xml");
            return document.InnerXml;
        }

        //获取sharepoint中指定文件的内容
        //public string GetProjectWorkflowUrl(SPFile file)
        //{      
        //    byte[] content = file.OpenBinary();
        //    contentStr = Encoding.UTF8.GetString(content);
        //    return contentStr;       
        //}

        #region GetDataSetByXml

        /// <summary>
        /// 读取xml直接返回DataSet 
        /// </summary>
        /// <param name="strXmlPath">xml文件相对路径</param>
        /// <returns></returns>
        public static DataSet GetDataSetByXml(string strXmlPath)
        {
            try
            {
                DataSet ds = new DataSet();
                ds.ReadXml(GetXmlFullPath(strXmlPath));
                if (ds.Tables.Count > 0)
                {
                    return ds;
                }
                return null;
            }
            catch (Exception )
            {
                return null;
            }
        }
        #endregion
        #region GetDataViewByXml
        /// <summary>
        /// 读取Xml返回一个经排序或筛选后的DataView 
        /// </summary>
        /// <param name="strXmlPath">xml文件相对路径</param>
        /// <param name="strWhere">筛选条件,如："name = ＇kgdiwss＇"</param>
        /// <param name="strSort">排序条件,如："Id desc"</param>
        /// <returns></returns>        
        public static DataView GetDataViewByXml(string strXmlPath, string strWhere, string strSort)
        {
            try
            {
                DataSet ds = new DataSet();
                ds.ReadXml(GetXmlFullPath(strXmlPath));
                DataView dv = new DataView(ds.Tables[0]);
                if (strSort != null)
                {
                    dv.Sort = strSort;
                }
                if (strWhere != null)
                {
                    dv.RowFilter = strWhere;
                }
                return dv;
            }
            catch (Exception)
            {
                return null;
            }
        }
        #endregion

        #region WriteXmlByDataSet
        /// 
        /// 向Xml文件插入一行数据 
        /// 
        /// xml文件相对路径 
        /// 要插入行的列名数组,如：string[] Columns = {"name","IsMarried"}; 
        /// 要插入行每列的值数组,如：string[] ColumnValue={"明天去要饭","false"}; 
        /// 成功返回true,否则返回false 
        public static bool WriteXmlByDataSet(string strXmlPath, string[] Columns, string[] ColumnValue)
        {
            try
            {
                //根据传入的XML路径得到.XSD的路径,两个文件放在同一个目录下 
                string strXsdPath = strXmlPath.Substring(0, strXmlPath.IndexOf(".")) + ".xsd";
                DataSet ds = new DataSet();
                //读xml架构,关系到列的数据类型 
                ds.ReadXmlSchema(GetXmlFullPath(strXsdPath));
                ds.ReadXml(GetXmlFullPath(strXmlPath));
                DataTable dt = ds.Tables[0];
                //在原来的表格基础上创建新行 
                DataRow newRow = dt.NewRow();
                //循环给一行中的各个列赋值 
                for (int i = 0; i < Columns.Length; i++)
                {
                    newRow[Columns[i]] = ColumnValue[i];
                }
                dt.Rows.Add(newRow);
                dt.AcceptChanges();
                ds.AcceptChanges();
                ds.WriteXml(GetXmlFullPath(strXmlPath));
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
        #endregion

        #region UpdateXmlRow
        /// 
        /// 更行符合条件的一条Xml记录 
        /// 
        /// XML文件路径 
        /// 列名数组 
        /// 列值数组 
        /// 条件列名 
        /// 条件列值 
        /// 
        public static bool UpdateXmlRow(string strXmlPath, string[] Columns, string[] ColumnValue, string strWhereColumnName, string strWhereColumnValue)
        {
            try
            {
                string strXsdPath = strXmlPath.Substring(0, strXmlPath.IndexOf(".")) + ".xsd";
                DataSet ds = new DataSet();
                //读xml架构,关系到列的数据类型 
                ds.ReadXmlSchema(GetXmlFullPath(strXsdPath));
                ds.ReadXml(GetXmlFullPath(strXmlPath));
                //先判断行数 
                if (ds.Tables[0].Rows.Count > 0)
                {
                    for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                    {
                        //如果当前记录为符合Where条件的记录 
                        if (ds.Tables[0].Rows[i][strWhereColumnName].ToString().Trim().Equals(strWhereColumnValue))
                        {
                            //循环给找到行的各列赋新值 
                            for (int j = 0; j < Columns.Length; j++)
                            {
                                ds.Tables[0].Rows[i][Columns[j]] = ColumnValue[j];
                            }
                            //更新DataSet 
                            ds.AcceptChanges();
                            //重新写入XML文件 
                            ds.WriteXml(GetXmlFullPath(strXmlPath));
                            return true;
                        }
                    }
                }
                return false;
            }
            catch (Exception)
            {
                return false;
            }
        }
        #endregion

        #region DeleteXmlRowByIndex
        /// 
        /// 通过删除DataSet中iDeleteRow这一行,然后重写Xml以实现删除指定行 
        /// 
        /// 
        /// 要删除的行在DataSet中的Index值 
        public static bool DeleteXmlRowByIndex(string strXmlPath, int iDeleteRow)
        {
            try
            {
                DataSet ds = new DataSet();
                ds.ReadXml(GetXmlFullPath(strXmlPath));
                if (ds.Tables[0].Rows.Count > 0)
                {
                    //删除符号条件的行 
                    ds.Tables[0].Rows[iDeleteRow].Delete();
                }
                ds.WriteXml(GetXmlFullPath(strXmlPath));
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
        #endregion

        #region DeleteXmlRows
        /// 
        /// 删除strColumn列中值为ColumnValue的行 
        /// 
        /// xml相对路径 
        /// 列名 
        /// strColumn列中值为ColumnValue的行均会被删除 
        /// 
        public static bool DeleteXmlRows(string strXmlPath, string strColumn, string[] ColumnValue)
        {
            try
            {
                DataSet ds = new DataSet();
                ds.ReadXml(GetXmlFullPath(strXmlPath));
                //先判断行数 
                if (ds.Tables[0].Rows.Count > 0)
                {
                    //判断行多还是删除的值多,多的for循环放在里面 
                    if (ColumnValue.Length > ds.Tables[0].Rows.Count)
                    {
                        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                        {
                            for (int j = 0; j < ColumnValue.Length; j++)
                            {
                                if (ds.Tables[0].Rows[i][strColumn].ToString().Trim().Equals(ColumnValue[j]))
                                {
                                    ds.Tables[0].Rows[i].Delete();
                                }
                            }
                        }
                    }
                    else
                    {
                        for (int j = 0; j < ColumnValue.Length; j++)
                        {
                            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                            {
                                if (ds.Tables[0].Rows[i][strColumn].ToString().Trim().Equals(ColumnValue[j]))
                                {
                                    ds.Tables[0].Rows[i].Delete();
                                }
                            }
                        }
                    }
                    ds.WriteXml(GetXmlFullPath(strXmlPath));
                }
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
        #endregion

        #region DeleteXmlAllRows
        /// 
        /// 删除所有行 
        /// 
        /// XML路径 
        /// 
        public static bool DeleteXmlAllRows(string strXmlPath)
        {
            try
            {
                DataSet ds = new DataSet();
                ds.ReadXml(GetXmlFullPath(strXmlPath));
                //如果记录条数大于0 
                if (ds.Tables[0].Rows.Count > 0)
                {
                    //移除所有记录 
                    ds.Tables[0].Rows.Clear();
                }
                //重新写入,这时XML文件中就只剩根节点了 
                ds.WriteXml(GetXmlFullPath(strXmlPath));
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
        #endregion

        #region GetXmlFullPath
        /// 
        /// 返回完整路径 
        /// 
        /// Xml的路径 
        /// 
        public static string GetXmlFullPath(string strPath)
        {
            //如果路径中含有:符号,则认定为传入的是完整路径 
            if (strPath.IndexOf(":") > 0)
            {
                return strPath;
            }
            else
            {
                //返回完整路径 
                return System.Web.HttpContext.Current.Server.MapPath(strPath);
            }
        }
        #endregion


    }
}