"DeleteAsync" 和 "File.Delete" 之间的差异以及为什么 "DeleteAsync" 不删除文件？

Question

想知道为什么 "DeleteAsync" 不删除文件但 "File.Delete" 会删除文件。谁可以给我解释一下这个？起初我认为文件是打开的，但如果文件是打开的 "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);
        }
    }
}

Answer 1

原因很可能是本地没有异步删除文件的功能。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

希望对您有所帮助！！

"DeleteAsync" 和 "File.Delete" 之间的差异以及为什么 "DeleteAsync" 不删除文件？

Differences between "DeleteAsync" and "File.Delete" and why "DeleteAsync" doesn't remove file?

c#

file

storagefolder

windows-10-universal