上传文件而不将内容复制到根文件夹 .NET Core 2.2

Question

我正在使用 Azure Blob 存储，我想知道是否可以稍微优化此代码。

正如您所看到的，我正在创建文件夹，然后在发送到 Azure 存储之前将内容上传到该文件夹​​，并且在竞争时我删除了该文件夹，公平地说，这似乎有点多余。

现在，我想知道是否可以跳过这几个步骤，直接将流上传到 azure 而无需先复制到根文件夹？

这是代码：

   public async Task UploadBlobFile(IFormFile file, BlobMetadata metadata,  string containerName)
    {
        var containerClient = _blobServiceClient.GetBlobContainerClient(containerName);

        BlobHttpHeaders headers = new BlobHttpHeaders
        {
            ContentType = "application/pdf",
            ContentLanguage = "hr-HR",
        };

        if (file.Length > 0)
        {
            try
            {
                var rootFolder = Path.Combine(_hostingEnvironment.WebRootPath, "upload");

                if (!Directory.Exists(rootFolder))
                {
                    Directory.CreateDirectory(rootFolder);
                }

                // create folder if doesnt exists
                var filePath = Path.Combine(rootFolder, file.FileName);
                using (var stream = new FileStream(filePath, FileMode.Create))
                {

                    await file.CopyToAsync(stream);

                    // set cursor to the beginning of the stream.
                    stream.Position = 0;

                    var metadataProperties = new Dictionary<string, string>
                    {
                        { MetadataValues.Id, metadata.Id },
                        { MetadataValues.Name, metadata.Name },
                        { MetadataValues.UniqueName, metadata.UniqueName }
                    };

                    var blobClient = containerClient.GetBlobClient(file.FileName);

                    await blobClient.UploadAsync(stream, headers, metadataProperties);

                }

                if (File.Exists(filePath))
                {
                    File.Delete(filePath);
                }
            }
            catch (Exception ex)
            {

                throw ex;
            }

        }

    }

Answer 1

正如Bradley Uffner和pinkfloydx33 所指出的，上面的代码可以这样优化

public async Task UploadBlobFile(IFormFile file, BlobMetadata metadata,  string containerName)
{
    var containerClient = _blobServiceClient.GetBlobContainerClient(containerName);
    BlobHttpHeaders headers = new BlobHttpHeaders
    {
        ContentType = "application/pdf",
        ContentLanguage = "hr-HR",
    };

    if (file.Length > 0)
    {
        using (var stream = file.OpenReadStream())
        {
            // set cursor to the beginning of the stream.
            stream.Position = 0;
            var metadataProperties = new Dictionary<string, string>
            {
                { MetadataValues.Id, metadata.Id },
                { MetadataValues.Name, metadata.Name },
                { MetadataValues.UniqueName, metadata.UniqueName }
            };

            var blobClient = containerClient.GetBlobClient(file.FileName);
            await blobClient.UploadAsync(stream, headers, metadataProperties);

        }
    }
}