想知道为什么“DeleteAsync”不删除文件,但“File.Delete”会这样做。谁可以给我解释一下这个?起初我认为该文件是打开的,但如果文件打开“File.Delete”也不应该删除它或...?
private static async void FILESYSTEM_RemoveVideoPosterIfExist(string posterFileNameOnStorage)
{
IStorageItem videoPosterIStorageItem = await ApplicationData.Current.LocalFolder.TryGetItemAsync(SYSTEM_UserVideoPosterFolder + @"\" + DATABASE_SelectedUserInformation.UserName + "." + SYSTEM_UserPosterFolderExtension + @"\" + posterFileNameOnStorage);
if (videoPosterIStorageItem != null)
{
try
{
//Why this doesn't delete file...
await videoPosterIStorageItem.DeleteAsync(StorageDeleteOption.PermanentDelete);
}
catch
{
//But this one will delete file.
StorageFolder applicationStorageFolder = await ApplicationData.Current.LocalFolder.GetFolderAsync(SYSTEM_UserVideoPosterFolder + @"\" + DATABASE_SelectedUserInformation.UserName + "." + SYSTEM_UserPosterFolderExtension + @"\");
File.Delete(applicationStorageFolder.Path + @"\" + posterFileNameOnStorage);
}
}
}
答案 0 :(得分:2)
原因可能是没有本机函数来异步删除文件。托管API通常是非托管API的包装器。
看看这个
Why isn't there an asynchronous file delete in .net?
FileInfo fi = new FileInfo(fileName);
await fi.DeleteAsync(); // C# 5
fi.DeleteAsync().Wait(); // C# 4
希望这会有所帮助!!