使用IsolatedStorage新建XML文件，并且用LINQ查询XML

今天实现了用IsolatedStorage新建XML文件，并且使用LINQ查询XML，虽然以前也用到了IsolatedStorage，但是当时没有保存为文件，而且直接使用的键/值，文件会自动创建。今天做的项目一个目录数，数据量特别大，每次形成TreeView时，时间比较长，另外这些数据基本上不会修改，所以想到把数据保存到本地，然后从本地读取数据，这样就会很快。下面我就分享一下我的代码

 

代码

using  System;
using  System.Linq;
using  System.Windows.Shapes;
using  System.Collections.Generic;
using  System.Collections.ObjectModel;
using  System.IO.IsolatedStorage;
using  System.IO;
using  System.Xml.Linq;
using  System.Xml;
namespace  ServiceFacade
{

     public   class  FResourceCategoryCode
    {
        readonly   string  strFileName  =   " ResourceCategoryCode.xml " ;
        List < FResourceCategoryCodeModel >  lfrccs  =   new  List < FResourceCategoryCodeModel > ();
///   <summary>
///  生成XML缓存文件
///   </summary>
public   void  CreateFile(List < FResourceCategoryCodeModel >  lfrccm)
{
try
{
using  (IsolatedStorageFile isoStore  =
IsolatedStorageFile.GetUserStoreForApplication())
{
using  (IsolatedStorageFileStream isoStream  =
new  IsolatedStorageFileStream(strFileName,
FileMode.Create, isoStore))
{
//  根据每个用户存储一个信息
XmlWriterSettings settings  =   new  XmlWriterSettings();
settings.Indent  =   true ;
//  创建一个XmlWriter.
using  (XmlWriter writer  =  XmlWriter.Create(isoStream, settings))
{
// 设置XML的根
writer.WriteStartElement( " ResourceCategorys " );
foreach  (var v  in  lfrccm)
{
// 设置每个元素的根
writer.WriteStartElement( " ResourceCategory " );

// 以下为设置每个元素及值
writer.WriteStartElement( " cncCategroyStandard " );
writer.WriteString(v.CncCategroyStandard);
writer.WriteEndElement();

writer.WriteStartElement( " cnvcCategoryCode " );
writer.WriteString(v.CnvcCategoryCode);
writer.WriteEndElement();

writer.WriteStartElement( " cnvcCategoryName " );
writer.WriteString(v.CnvcCategoryName);
writer.WriteEndElement();

writer.WriteStartElement( " cniLevel " );
writer.WriteString(Convert.ToString(v.CniLevel));
writer.WriteEndElement();

writer.WriteStartElement( " cnvcParentCode " );
writer.WriteString(v.CnvcParentCode);
writer.WriteEndElement();

writer.WriteStartElement( " cniOrderID " );
writer.WriteString(Convert.ToString(v.CniOrderID));
writer.WriteEndElement();

// XML结束标记
writer.WriteEndElement();
}
// XML根结束标记
writer.WriteEndElement();
writer.Flush();
}
}
}
}
catch
{
;
}
}

///   <summary>
         ///  读取缓存文件
         ///   </summary>
         private   void  ReadXml()
        {
             using  (IsolatedStorageFile store  =
                     IsolatedStorageFile.GetUserStoreForApplication())
            {
                 // 读取文件并把文件转化为StreamReader
                StreamReader reader  =   new  StreamReader(store.OpenFile(strFileName,
                   FileMode.Open, FileAccess.Read));
                 // 把字符串转化为XML
                XDocument xmlStory  =  XDocument.Parse(reader.ReadToEnd());
                 // 利用LINQ TO XML转化为集合
               var varDetails  =  from details  in  xmlStory.Descendants( " ResourceCategory " )   // 只取得节点为ResourceCategory的信息
                                 select  new  FResourceCategoryCodeModel
                                 {
                                     CncCategroyStandard  =  ( string )details.Element( " cncCategroyStandard " ),
                                     CnvcCategoryCode  =  ( string )details.Element( " cnvcCategoryCode " ),
                                     CnvcCategoryName  =  ( string )details.Element( " cnvcCategoryName " ),
                                     CniLevel  =  ( int )details.Element( " cniLevel " ),
                                     CniOrderID  =  ( int )details.Element( " cniOrderID " ),
                                     CnvcParentCode  =  ( string )details.Element( " cnvcParentCode " )
                                 };
                lfrccs  =  varDetails.ToList < FResourceCategoryCodeModel > ();
                store.Dispose();
            }
        }

///   <summary>
         ///  实体类
         ///   </summary>
   public   class  FResourceCategoryCodeModel
    {
         private   int  _cniCategroyID;
         ///   <summary>
         ///  流水号
         ///   </summary>
         public   int  CniCategroyID
        {
             get  {  return  _cniCategroyID; }
             set  { _cniCategroyID  =  value; }
        }
         private   string  _cncCategroyStandard;
         ///   <summary>
         ///  标准分类编码
         ///   </summary>
         public   string  CncCategroyStandard
        {
             get  {  return  _cncCategroyStandard; }
             set  { _cncCategroyStandard  =  value; }
        }
         private   string  _cnvcCategoryCode;
         ///   <summary>
         ///  资源分类编码
         ///   </summary>
         public   string  CnvcCategoryCode
        {
             get  {  return  _cnvcCategoryCode; }
             set  { _cnvcCategoryCode  =  value; }
        }
         private   string  _cnvcCategoryName;
         ///   <summary>
         ///  资源分类名称
         ///   </summary>
         public   string  CnvcCategoryName
        {
             get  {  return  _cnvcCategoryName; }
             set  { _cnvcCategoryName  =  value; }
        }
         private   int  _cniLevel;
         ///   <summary>
         ///  资源分类层级
         ///   </summary>
         public   int  CniLevel
        {
             get  {  return  _cniLevel; }
             set  { _cniLevel  =  value; }
        }
         private   string  _cnvcParentCode;
         ///   <summary>
         ///  资源分类父级代码
         ///   </summary>
         public   string  CnvcParentCode
        {
             get  {  return  _cnvcParentCode; }
             set  { _cnvcParentCode  =  value; }
        }
         private   int  _cniOrderID;
         ///   <summary>
         ///  排序ID
         ///   </summary>
         public   int  CniOrderID
        {
             get  {  return  _cniOrderID; }
             set  { _cniOrderID  =  value; }
        }
         private   string  _cnvcRemark;
         ///   <summary>
         ///  说明文字
         ///   </summary>
         public   string  CnvcRemark
        {
             get  {  return  _cnvcRemark; }
             set  { _cnvcRemark  =  value; }
        }
}
}
}

 

 

然后通过调用方法CreateFile和ReadXml就可以实现了，文件存放的地址是SL的独立空间，在XP系统下的存放地址为C:\Documents and Settings\用户名\Local Settings\Application Data\Microsoft\Silverlight目录下，可以找到很多缓存文件
好了，就写到这了，有时间再完善一下，希望对大家有用