以对象的方式来访问xml数据表（二）

　　为什么要以对象的方式来访问

　　还记得，自己是在一次完成师兄布置的任务时接触到了

　　自己做的第一个WPF桌面应用程序——备忘录，就是用

　　这是我第一个版本的访问

using System;using System.Collections.Generic;using System.Linq;using System.using System.IO;using System.Text.RegularExpressions;namespace public class #region 私有字段    private get='_blank'>string private string[] private string noteName;    #endregion    #region 公有字段    public XElement Notes;    #endregion    #region 公有方法    //连接数据文件    public bool Connect(string path_, string noteName_, params string[] properties)    {      try      {        //匹配        if (!Regex.IsMatch(path_, @"^(?<fpath>([a-zA-Z]:\\)([\s\.\-\w]+\\)*)(?<fname>[\w]+.[\w]+)") || noteName_ == "" || path_.Length < 5 || path_.Substring(path_.Length - 3).ToLower() != "")        {          return false;        }        noteName = noteName_;//记录每条记录的名称        //记录文件路径        if (path_.LastIndexOf("\\") > 0)        {          path_ = path_.Substring(0, path_.LastIndexOf("\\"));        }        else        {          path_ = "";        }        if (path_ != "" && !Directory.Exists(path_))        {          Directory.CreateDirectory(path_);          var new StreamWriter("<?");          "<" + noteName + "s>");          "</" + noteName + "s>");          else        {          if (!File.Exists(var new StreamWriter("<?");            "<" + noteName + "s>");            "</" + noteName + "s>");            = XElement.Load(= new string[properties.Length];        = properties;//记录每条记录的属性        return true;      }      catch (Exception e)      {        throw e;        //return false;      }    }    //保存数据文件    public bool SaveChanged()    {      try      {        Notes.Save(return true;      }      catch (Exception e)      {        throw e;        //return false;      }    }    //添加纪录:添加到末尾(方法一)    public bool AddNote(params string[] propertyValues)    {      try      {        if (propertyValues.Length == if (Notes.Elements(noteName).Count() > 0)          {            int newNo;            var lastNote = from Note in Notes.Elements() select Convert.ToInt32(Note.Attribute("No").Value);            newNo = lastNote.Max() + 1;            Notes.LastNode.AddAfterSelf(noteName, new XAttribute("No", newNo));            for (int i = 0; i < )            {              if (i == 0)              {                Notes.Elements().Last().AddFirst(new XElement(else              {                Notes.Elements().Last().LastNode.AddAfterSelf(new XElement(else          {            Notes.AddFirst(new XElement(noteName, new XAttribute("No", 1)));            for (int i = 0; i < )            {              if (i == 0)              {                Notes.Element(noteName).AddFirst(new XElement(else              {                Notes.Element(noteName).LastNode.AddAfterSelf(new XElement(return true;        }        else        {          return false;        }      }      catch (Exception e)      {        throw e;        //return false;      }    }    //添加记录:添加到末尾（方法二）    public bool AddNote(XElement newNote)    {      try      {        if (newNote.Elements().Count() == if (Notes.Elements(noteName).Count() > 0)          {            int newNo;            var lastNote = from Note in Notes.Elements() select Convert.ToInt32(Note.Attribute("No").Value);            newNo = lastNote.Max() + 1;            if(newNote.Attribute("No") == null)            {              newNote.Add(new XAttribute("No", newNo));            }            else            {              newNote.Attribute("No").Value = newNo.ToString();            }            Notes.Elements().Last().AddAfterSelf(newNote);          }          else          {            if (newNote.Attribute("No") == null)            {              newNote.Add(new XAttribute("No", 1));            }            else            {              newNote.Attribute("No").Value = "1";            }            Notes.AddFirst(newNote);          }          return true;        }        else        {          return false;        }      }      catch (Exception e)      {        throw e;        //return false;      }    }    //添加记录:添加到开头    public bool AddFistNote(XElement newNote)    {      try      {        if (newNote.Elements().Count() == if (Notes.Elements(noteName).Count() > 0)          {            int newNo;            var lastNote = from Note in Notes.Elements() select Convert.ToInt32(Note.Attribute("No").Value);            newNo = lastNote.Max() + 1;            if (newNote.Attribute("No") == null)            {              newNote.Add(new XAttribute("No", newNo));            }            else            {              newNote.Attribute("No").Value = newNo.ToString();            }            Notes.AddFirst(newNote);          }          else          {            if (newNote.Attribute("No") == null)            {              newNote.Add(new XAttribute("No", 1));            }            else            {              newNote.Attribute("No").Value = "1";            }            Notes.AddFirst(newNote);          }          return true;        }        else        {          return false;        }      }      catch (Exception e)      {        throw e;        //return false;      }    }    //删除记录(单一索引)    public bool DeletNote(string no = "", params string[] propertyValues)    {      try      {        bool okFlag = false;        if (propertyValues.Length > return false;        }        else        {          if (no == "") //按属性值相等删除          {            for (int i = 0; i < propertyValues.Length; i++)            {              if (propertyValues[i] == "") continue;              if (Notes.Elements(noteName).Count() == 0) return false;//数据文件内容为空              var proNotes = Notes.Elements(noteName).Elements( propertyValues[i]);              foreach (var item in proNotes)              {                item.Parent.Remove();                okFlag = true;              }            }          }          else //按编号相等删除          {            if (Notes.Elements(noteName).Count() == 0) return false;//数据文件内容为空            var proNote = Notes.Elements(noteName).SingleOrDefault(m => m.Attribute("No").Value == no);            if (proNote != null)            {              proNote.Remove();              okFlag = true;            }          }          return okFlag;        }      }      catch (Exception e)      {        throw e;        //return false;      }    }    //修改记录(编号索引:方法一)    public bool ModifyNote(string no, params string[] propertyValues)    {      try      {        if (no == "" || propertyValues.Length != return false;        }        bool okFlag = false;        if (Notes.Elements(noteName).Count() == 0) return false;//数据文件内容为空        var proNote = Notes.Elements(noteName).Attributes("No").SingleOrDefault(m => m.Value == no);        if (proNote != null)        {          var proSubNotes = proNote.Parent.Elements();          int i = 0;          foreach (var item in proSubNotes)          {            item.Value = propertyValues[i++];          }          okFlag = true;        }        return okFlag;      }      catch (Exception e)      {        throw e;        //return false;      }    }    //修改记录(编号索引:方法二用一个新的节点（No值不变）替代)    public bool ModifyNote(string no, XElement noteModified)    {      try      {        if (no == "" || noteModified.Elements().Count() != return false;        }        bool okFlag = false;        if (Notes.Elements(noteName).Count() == 0) return false;//数据文件内容为空        var proNote = Notes.Elements(noteName).Attributes("No").SingleOrDefault(m => m.Value == no);        if (proNote != null)        {          proNote.Parent.ReplaceWith(noteModified);        }        return okFlag;      }      catch (Exception e)      {        throw e;        //return false;      }    }    //查询记录（单一索引）    public IEnumerable<XElement> QueryNote(string no = "", params string[] propertyValues)    {      IEnumerable<XElement> result = null;      try      {        if (no == "" && propertyValues.Length == 0)//返回所有数据        {          return Notes.Elements(noteName);        }        if (no == "" && propertyValues.Length != 0)        {          for (int i = 0; i < propertyValues.Length; i++)          {            if (propertyValues[i] == "") continue;            if (Notes.Elements(noteName).Count() == 0) return result;//数据文件内容为空            var proNotes = Notes.Elements(noteName).Elements( propertyValues[i]);            return proNotes;          }        }        else        {          if (Notes.Elements(noteName).Count() == 0) return result;//数据文件内容为空          var proNote = Notes.Elements(noteName).Attributes("No").SingleOrDefault(m => m.Value == no);          if (proNote != null)          {            result = new XElement[] { proNote.Parent };          }        }        return result;      }      catch (Exception e)      {        throw e;        //return false;      }    }    //获取记录的条数    public int Count()    {      try      {        return Notes.Elements(noteName).Count();      }      catch (Exception e)      {        throw e;        //return false;      }    }    //获取所有记录    public IEnumerable<XElement> AllNotes()    {      try      {        return Notes.Elements(noteName);      }      catch (Exception e)      {        throw e;        //return false;      }    }    //获取最后一条记录的No    public int GetLastNoteNo()    {      try      {        if (Notes.Elements(noteName).Count() > 0)          return (from Note in Notes.Elements(noteName) select Convert.ToInt32(Note.Attribute("No").Value)).Max();        else          return 0;      }      catch (Exception e)      {        throw e;        //return false;      }    }    #endregion  }}

原标题：以对象的方式来访问xml数据表（二）

关键词：xml