AzureのWebAppsでAzure Blob StorageのjsonをAPI的に返却

WebAppsでBlobストレージのデータにアクセスしてデータを返すメモ

###ストレージへのアクセスをTASK化

static async Task<string> GetJsonData()
{
    //storageAccountの作成（接続情報の定義）
    var accountName = "ストレージのアカウント名";
    var accessKey = "accessKey文字列";
    var credential = new StorageCredentials(accountName, accessKey);
    var storageAccount = new CloudStorageAccount(credential, true);
    //blob
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
    //container
    CloudBlobContainer container = blobClient.GetContainerReference("demo");
    //data
    CloudBlockBlob blockBlob_download = container.GetBlockBlobReference("demo.json");
    string text;
    using (var memoryStream = new MemoryStream())
    {
        await blockBlob_download.DownloadToStreamAsync(memoryStream);
        text = System.Text.Encoding.UTF8.GetString(memoryStream.ToArray());
    }
    return text;
}
```

###HttpGetの処理

```C#
[HttpGet]
public ActionResult<string> Get()
{
    var task = GetJsonData();
    var result = task.Result;
    return result;
}
```


###参考サイト

Azure Storage (blob)を使う
https://qiita.com/zaburo/items/ed2f5ee1224ab40bd7b1

Azure Blob Storage と Visual Studio 接続済みサービスの概要 (ASP.NET)
https://github.com/MicrosoftDocs/azure-docs.ja-jp/blob/master/articles/visual-studio/vs-storage-aspnet-getting-started-blobs.md

ASP.NET で Azure Blob Storage を操作してみる
https://qiita.com/komiyasa/items/f69dc1ab773bfc3115bd