前回Azure StorageのBlob Storageにコンテイナーを作成し、ファイルをアップロードする方法を公開しました。今回は実際にユーザーのフォームからファイルをアップロードするフローをカバーします。

前回の記事はこちら
https://qiita.com/syantien/items/ee8c88c649d5b0617ccd

フォーム (フロント、Razor)


@using (Html.BeginForm("UploadFiles", "Blob", FormMethod.Post, new { @enctype = "multipart/form-data" }))
{
    @Html.Hidden("container", ViewData["Container"])
    @Html.TextBox("files", "", new { @type = "file", @multiple = "mulitiple" })
    <button type="submit" class="btn btn-primary rounded-0">Upload</button>
}

コントローラー (処理)


[HttpPost]
public async Task<IActionResult> UploadFiles(List<IFormFile> files, string container)
{
  var result = await _blobHandlers.UploadFilesAsync(files, container);
  return RedirectToAction("Container", new { @id = container });
}

上記にある_blobHandlers.UploadFilesAsyncは下記のとおりです　


/// <summary>
/// Upload files
/// </summary>
/// <param name="FileToUpload"></param>
/// <param name="container"></param>
/// <returns></returns>
/// <summary>
/// Upload files
/// </summary>
/// <param name="FileToUpload"></param>
/// <param name="container"></param>
/// <returns></returns>
public async Task<List<string>> UploadFilesAsync(List<IFormFile> FileToUpload, string container)
{
  var AbsoluteUris = new List<string>();

  // Get azure table storage connection string.  
  string ConnectionString = _config.Value.AzureBlobSettings.connection;
  CloudStorageAccount storageAccount = CloudStorageAccount.Parse(ConnectionString);

  CloudBlobClient cloudBlobClient = storageAccount.CreateCloudBlobClient();

  var blobContainer = cloudBlobClient.GetContainerReference(container);

  // If container does not exist
  if (!blobContainer.Exists())
  {
    await blobContainer.CreateAsync();

    // Set the permissions so the blobs are public.
    BlobContainerPermissions permissions = new BlobContainerPermissions
    {
      PublicAccess = BlobContainerPublicAccessType.Blob
    };
    
    await blobContainer.SetPermissionsAsync(permissions);
  }

  foreach (var formFile in FileToUpload)
  {
    if (formFile.Length > 0)
    {
      try
      {
        string FileName = Path.GetFileName(formFile.FileName);

        CloudBlockBlob blockBlob;
        // Create a block blob  
        blockBlob = blobContainer.GetBlockBlobReference(FileName);

        // Set the object's content type  
        blockBlob.Properties.ContentType = formFile.ContentType;

        // upload to blob  
        blockBlob.UploadFromStream(formFile.OpenReadStream());

        // get file uri  
        AbsoluteUris.Add(blockBlob.Uri.AbsoluteUri);
      }
      catch (Exception ExceptionObj)
      {
        throw ExceptionObj;
      }
    }
  }
  return AbsoluteUris;
}

終わり

今回は以上です