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想知道为什么“DeleteAsync”不会删除文件,但“File.Delete”会这样做。谁可以给我解释一下这个?起初我认为文件是打开的,但是如果文件是打开的,“File.Delete”也不应该删除它,或者......?

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);
        }
    }
}
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1 回答 1

2

原因很可能是没有异步删除文件的原生函数。托管 API 通常是非托管 API 的包装器。

看看这个

为什么.net 中没有异步文件删除?

 FileInfo fi = new FileInfo(fileName);
 await fi.DeleteAsync(); // C# 5
 fi.DeleteAsync().Wait(); // C# 4

希望这可以帮助!!

于 2016-12-03T11:44:24.807 回答