Operation not permitted on IsolatedStorageFileStream 解决方法

在做Windows Phone开发时，应该都遇到过 Operation not permitted on IsolatedSotrageFileStream异常。比如，刚刚Create的File，马上去读就会遇到这样的问题。问题在于IsolatedStorageFile.CreateFile返回的是一个IsolatedStorageFileStream, 而在IsolatedStorageFile.OpenFile时又会创建另一个IsolatedStorageFileStream而前者并没有释放, 因此就会出现这样的问题。正确的用法如下。

using (IsolatedStorageFile isolatedStorageFile = IsolatedStorageFile.GetUserStoreForApplication())
{
logPath = Path.Combine(lowerAppName, eventLogFileName);

if (!isolatedStorageFile.FileExists(logPath))
{
using (IsolatedStorageFileStream createFileStream = isolatedStorageFile.CreateFile(logPath))
{
createFileStream.Close();
}

using (
IsolatedStorageFileStream writeFileStream = isolatedStorageFile.OpenFile(logPath,
FileMode.OpenOrCreate,
FileAccess
.ReadWrite,
FileShare.ReadWrite)
)
using (var streamWriter = new StreamWriter(writeFileStream))
{

streamWriter.WriteLine("Event Log：");

streamWriter.Close();
writeFileStream.Close();

writeFileStream.Dispose();
}
}
}