Silverlight Isolated Storage 独立存储

基础操作语法

using System.IO.IsolatedStorage;
using System.IO;

       void CreateDir(string dirName)
       {
           IsolatedStorageFile storeFile =
               IsolatedStorageFile.GetUserStoreForApplication();
           storeFile.CreateDirectory(dirName);
       }

       void SaveFile(string savePath, string content)
       {
           IsolatedStorageFile storeFile =
               IsolatedStorageFile.GetUserStoreForApplication();
           IsolatedStorageFileStream sf = storeFile.CreateFile(savePath);
           using (StreamWriter sw = new StreamWriter(sf))
           {
               sw.WriteLine(content);
           }
           sf.Close();
       }

       void LoadFile(string readPath)
       {
           string content = string.Empty;
           using (IsolatedStorageFile storeFile =
               IsolatedStorageFile.GetUserStoreForApplication())
           {
               if (storeFile.FileExists(readPath))
               {
                   StreamReader sr =
                       new StreamReader(storeFile.OpenFile
                           (readPath, FileMode.Open, FileAccess.Read));
                   content = sr.ReadToEnd();
               }
           }
       }

       void DeleteFile(string path)
       {
           using (IsolatedStorageFile storeFile =
               IsolatedStorageFile.GetUserStoreForApplication())
           {
               storeFile.DeleteFile(path);
           }
       }

       void DeleteDir(string dirPath)
       {
           using (IsolatedStorageFile storeFile =
               IsolatedStorageFile.GetUserStoreForApplication())
           {
               storeFile.DeleteDirectory(dirPath);
           }
       }

       void LoadDirs()
       {
           using (IsolatedStorageFile storeFile =
               IsolatedStorageFile.GetUserStoreForApplication())
           {
               var itemSource = storeFile.GetDirectoryNames("*");
           }
       }

名值对方式存储读取

这种方式就很像Cookie了

       string ReadSettings(string key)
       {
           IsolatedStorageSettings settings =
               IsolatedStorageSettings.ApplicationSettings;
           return settings[key].ToString();
       }

       void SaveSettings(string key, string value)
       {
           IsolatedStorageSettings settings =
               IsolatedStorageSettings.ApplicationSettings;
           settings.Add(key, value);
           settings.Save();
       }

       void ClearSettings()
       {
           IsolatedStorageSettings settings =
               IsolatedStorageSettings.ApplicationSettings;
           settings.Clear();
       }

独立存储的文件与名值对分别有两个示例，可以在目录地址链接下载代码阅读。

独立存储的空间大小

独立存储默认的空间上限是1M，可以通过代码设置让这个上限加大。代码如下

           //使1用?应|用?程ì序ò存?储￠创′建¨对?象ó
            using (IsolatedStorageFile storeFile =
                IsolatedStorageFile.GetUserStoreForApplication())
            {
                //获?取?旧é空?间?大ó小?
                long oldSize = storeFile.AvailableFreeSpace;
                //定¨义?新?增?空?间?大ó小?
                long newSize = 2097152;
                if (oldSize < newSize)
                {
                    //分?配?新?的?存?储￠空?间?
                    storeFile.IncreaseQuotaTo(newSize);
                }
            }

 

客户可以通过邮件Silverlight 控件选择Silverlight配置中 ->应用程序存储选项卡 中查看本地有存储了那些Silverlight应用存储信息。

引用地址：http://terryfeng.iteye.com/blog/595578