关闭文件连接

我无法弄清楚我在哪里错误地释放了资源/关闭了文件。我在任何地方都使用 using，但仍然出现该文件已被另一个进程使用的异常

public class DownloadControllerBase : ControllerBase
{
    private readonly IUpdateFile _updateFile;
    public DownloadControllerBase(IUpdateFile updateFile)
    {
        _updateFile = updateFile;
    }

    public async Task<IActionResult> DownloadFilesBase(
        int userID,
        string folderForDownloadCryptedFiles,
        string zipFileName)
    {
        try
        {
            string encryptedFilesFolder = Path.Combine(folderForDownloadCryptedFiles, $"User({userID})");
            string[] files = Directory.GetFiles(encryptedFilesFolder);

            if (files.Length == 0)
                return StatusCode(404, new { message = BaseErrorMessage.DownloadNoFiles });

            string zipFilePath = Path.Combine(encryptedFilesFolder, zipFileName);
            await CreateZipFile(userID, zipFilePath, files);

            return await DeleteZipAndCreateResponse(zipFilePath, zipFileName);
        }
        catch (DirectoryNotFoundException)
        {
            return StatusCode(404, new { message = BaseErrorMessage.FolderNotFound });
        }
    }

    private async Task CreateZipFile(int userID, string zipFilePath, string[] files)
    {
        using var zipStream = new FileStream(zipFilePath, FileMode.Create);
        using var archive = new ZipArchive(zipStream, ZipArchiveMode.Create, true);
        foreach (var file in files)
        {
            var fileInfo = new FileInfo(file);
            var entry = archive.CreateEntry(fileInfo.Name, CompressionLevel.Fastest);

            using (var entryStream = entry.Open())
            using (var fileStream = new FileStream(file, FileMode.Open, FileAccess.Read))
            {
                await fileStream.CopyToAsync(entryStream);
            }
            var fileName = Path.GetFileName(file);
            await UpdateFile(userID, fileName);

            await Task.Run(() => System.IO.File.Delete(file));
        }
    }

    private async Task UpdateFile(int userID, string fileName)
    {
        var DbData = new UserFileModel()
        {
            user_id = userID,
            file_name = fileName,
            status = Status.downloaded.ToString(),
            download_time = DateTime.UtcNow
        };

        await _updateFile.UpdateFileByNameOrID(DbData, "fileName");
    }

    private async Task<IActionResult> DeleteZipAndCreateResponse(string zipFilePath, string zipFileName)
    {
        using var stream = new FileStream(zipFilePath, FileMode.Open, FileAccess.Read);

        await Task.Run(() => System.IO.File.Delete(zipFilePath));

        return File(stream, "application/zip", zipFileName);
    }
}

这是在控制器中调用该方法的方式：

    [HttpGet("Download")]
    public async Task<IActionResult> DownloadFiles([FromRoute] string type)
    {
        try
        {
            var param = _cryptographyParams.GetCryptographyParamsNoKey(type, FuncType.encrypt.ToString());

            return await _downloadController.DownloadFilesBase(_userInfo.UserId, param.downloadFolder, "EncryptedFiles.zip");
        }
        catch (InvalidRouteException ex)
        {
            return StatusCode(404, new { message = ex.Message });
        }
    }

异常日志：

fail: Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1]
      An unhandled exception has occurred while executing the request.
      System.IO.IOException: The process cannot access the file 'C:\FileCryptWeb Users\Private\Encrypted files for download\User(22)\EncryptedFiles.zip' because it is being used by another process.
         at Microsoft.Win32.SafeHandles.SafeFileHandle.CreateFile(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options)
         at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
         at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
         at System.IO.Strategies.FileStreamHelpers.ChooseStrategyCore(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
         at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
         at FileCryptWeb.Controllers.BaseControllers.DownloadControllerBase.CreateZipFile(Int32 userID, String zipFilePath, String[] files) in C:\Users\Stewi\Source\Repos\air2921\FileCryptWeb\FileCryptWeb\Controllers\BaseControllers\DownloadControllerBase.cs:line 51
         at FileCryptWeb.Controllers.BaseControllers.DownloadControllerBase.DownloadFilesBase(Int32 userID, String folderForDownloadCryptedFiles, String zipFileName) in C:\Users\Stewi\Source\Repos\air2921\FileCryptWeb\FileCryptWeb\Controllers\BaseControllers\DownloadControllerBase.cs:line 31
         at FileCryptWeb.Controllers.CryptionControllers.EncryptionController.DownloadFiles(String type) in C:\Users\Stewi\Source\Repos\air2921\FileCryptWeb\FileCryptWeb\Controllers\EnryptionControllers\EncryptionController.cs:line 94
         at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
         at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
         at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
         at FileCryptWeb.JwtTokenMiddleware.Invoke(HttpContext context, FileCryptDbContext dbContext, ITokenService tokenService) in C:\Users\Stewi\Source\Repos\air2921\FileCryptWeb\FileCryptWeb\JwtTokenMiddleware.cs:line 47
         at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)