下载Blob存储并返回Json对象 [英] Download blob storage and return Json object

问题描述

我正在尝试使用Newtonsoft.Json下载存储在Azure Storage容器中的.json blob，并将其写入对象.

I am trying to download a .json blob that I have stored in a container in the Azure Storage using Newtonsoft.Json to write it to an object.

我通过致电:

(CloudBlockBlob) blob.DownloadToStream(stream);

但是，我不想将流写入本地应用程序目录中的文件中，而是要返回json object做Json(result)

However, instead of writing the stream to a file in the local app directory, I want to return the json object doing Json(result)

这是我尝试过的:

using (var stream = new MemoryStream())
{
    blob.DownloadToStream(stream);

    var serializer = new JsonSerializer();

    using (var sr = new StreamReader(stream))
    {
        using (var jsonTextReader = new JsonTextReader(sr))
        {
            result = serializer.Deserialize(jsonTextReader);
        }
    }
}

最后，我的jsonTextReader变量为空，而对象null

At the end my jsonTextReader variable is empty and the object null

我该怎么做?

谢谢

推荐答案

在将Blob读入流后，请将流的位置重置为0.因此您的代码将是:

Please reset the stream's position to 0 after reading the blob into the stream. So your code would be:

        using (var stream = new MemoryStream())
        {
            blob.DownloadToStream(stream);
            stream.Position = 0;//resetting stream's position to 0
            var serializer = new JsonSerializer();

            using (var sr = new StreamReader(stream))
            {
                using (var jsonTextReader = new JsonTextReader(sr))
                {
                    var result = serializer.Deserialize(jsonTextReader);
                }
            }
        }

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