Winphone 没有直接删除文件夹的接口（因为文件夹不为空是删除不了的），所以要自己实现
public static void DeleteDirectoryRecursively(this IsolatedStorageFile storageFile, String dirName){
String pattern = dirName + @"\*";
String[] files = storageFile.GetFileNames(pattern);
foreach (var fName in files)
{
storageFile.DeleteFile(Path.Combine(dirName, fName));
}
String[] dirs = storageFile.GetDirectoryNames(pattern);
foreach (var dName in dirs)
{
DeleteDirectoryRecursively(storageFile, Path.Combine(dirName, dName));
}
storageFile.DeleteDirectory(dirName);}http://stackoverflow.com/questions/18422331/easy-way-to-recursively-delete-directories-in-isolatedstorage-on-wp7-8
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