“DeleteAsync”和“File.Delete”之间的差异以及为什么“DeleteAsync”不会删除文件?

时间:2016-12-03 11:17:16

标签: c# file windows-10-universal storagefolder

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);
        }
    }
}

1 个答案:

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!!