关于isolatedstorage：windows phone 7 中的孤立存储异常

Isolated storage exception in windows phone 7

我正在尝试做一个设置页面，用户可以从列表选择器控件中选择问题、歌曲和通过率的数量..

然后将选中的题目、歌曲和通过率的索引写入隔离存储。

下面是我的代码：

int indexQues;

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string rate;
private void saveBtn_Click(object sender, RoutedEventArgs e)
{
using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
if (myIsolatedStorage.FileExists("SettingFolder\\\\queSetting.txt"))
{
myIsolatedStorage.DeleteFile("SettingFolder\\\\queSetting.txt");
}

if (myIsolatedStorage.FileExists("SettingFolder\\\
ateSetting.txt"))
{
myIsolatedStorage.DeleteFile("SettingFolder\\\
ateSetting.txt");
}
}

indexQues = queListPicker.SelectedIndex;
rate = rateListPicker.SelectedItem.ToString();

//Save the number of question to answer when the alarm ring
//Obtain the virtual store for application
IsolatedStorageFile myStore = IsolatedStorageFile.GetUserStoreForApplication();
IsolatedStorageFile myStore1 = IsolatedStorageFile.GetUserStoreForApplication();
//Create a new folder and call it"AlarmFolder"
myStore.CreateDirectory("SettingFolder");

//Retrieve the content of"noOfQues"
//And write it into queSetting.txt
StreamWriter writeFile = new StreamWriter(new IsolatedStorageFileStream("SettingFolder\\\\queSetting.txt", FileMode.Append, myStore));
StreamWriter writeFile1 = new StreamWriter(new IsolatedStorageFileStream("SettingFolder\\\
ateSetting.txt", FileMode.Append, myStore));

writeFile.Write(indexQues);
writeFile1.Write(rate);
writeFile.Close();
writeFile1.Close();

MessageBox.Show("Setting Saved");
NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
}

上面的代码允许我写入隔离存储，但是当我第三次尝试保存时出现错误。

错误是"IsolatedStorageException 未处理"
访问独立存储时出错。

我不确定这是否是您的问题的原因，但我从未使用 StreamWriter 写入隔离存储。尝试将编写代码更改为以下内容：

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//Save the number of question to answer when the alarm ring
//Obtain the virtual store for application
IsolatedStorageFile myStore = IsolatedStorageFile.GetUserStoreForApplication();

//Create a new folder and call it"AlarmFolder"
myStore.CreateDirectory("SettingFolder");

//Retrieve the content of"noOfQues"
//And write it into queSetting.txt
using( IsolatedStorageFileStream isoStream =
new IsolatedStorageFileStream("SettingFolder\\\\queSetting.txt",
FileMode.Append, myStore)) ) {

byte[] indexBytes = UTF8Encoding.UTF8.GetBytes( indexQues.ToString() );

isoStream.Write(indexBytes, 0, indexBytes.Length);
isoStream.Flush();
}

using( IsolatedStorageFileStream isoStream =
new IsolatedStorageFileStream("SettingFolder\\\
ateSetting.txt",
FileMode.Append, myStore)) ) {

byte[] rateBytes = UTF8Encoding.UTF8.GetBytes( rate );

isoStream.Write(rateBytes, 0, rateBytes.Length);
isoStream.Flush();
}