C# 如何从Azure Blob存储下载、解压缩和反序列化对象/文件？

此代码将压缩并序列化对象：

public static byte[] ObjectToByteArray(object[] obj)
        {
            using (MemoryStream msCompressed = new MemoryStream())
            using (GZipStream gZipStream = new GZipStream(msCompressed, CompressionMode.Compress))
            using (MemoryStream msDecompressed = new MemoryStream())
            {
                new BinaryFormatter().Serialize(msDecompressed, obj);
                byte[] byteArray = msDecompressed.ToArray();

                gZipStream.Write(byteArray, 0, byteArray.Length);
                gZipStream.Close();
                return msCompressed.ToArray();
            }
        }

以下内容将上载到Azure Blob存储：

byte[] byteObject = ObjectToByteArray(uploadObject);

            using (Stream stream = new MemoryStream(byteObject))
            {

                stream.Seek(0, SeekOrigin.Begin);
                blockBlob.UploadFromStream(stream, null, options);
            }

---

这非常有效，但我找不到从我的存储中下载、解压缩和反序列化此对象/文件的方法。

您可以使用方法下载到流将文件下载到本地

using (var fileStream = System.IO.File.OpenWrite(@"xxxx\compressedfile.gz"))
{
    blockBlob.DownloadToStream(fileStream);
}

然后您可以参考下面的代码来解压缩和反序列化指定的流

public static void DecompressAndDeserialize(string path)
{
    using (FileStream originalFileStream = new FileStream(path, FileMode.Open, FileAccess.Read))
    {
        FileInfo fileToDecompress = new FileInfo(path);

        string FileName = fileToDecompress.FullName;
        string newFileName = FileName.Remove(FileName.Length - fileToDecompress.Extension.Length);

        using (FileStream decompressedFileStream = File.Create(newFileName))
        {
            using (GZipStream decompressionStream = new GZipStream(originalFileStream, CompressionMode.Decompress))
            {
                decompressionStream.CopyTo(decompressedFileStream);
            }
        }

        FileStream fs = new FileStream(newFileName, FileMode.Open);

        BinaryFormatter formatter = new BinaryFormatter();

        object[] uploadObject = (object[])formatter.Deserialize(fs);
    }
}

---

您可以使用方法DownloadToStream将文件下载到本地

using (var fileStream = System.IO.File.OpenWrite(@"xxxx\compressedfile.gz"))
{
    blockBlob.DownloadToStream(fileStream);
}

然后您可以参考下面的代码来解压缩和反序列化指定的流

public static void DecompressAndDeserialize(string path)
{
    using (FileStream originalFileStream = new FileStream(path, FileMode.Open, FileAccess.Read))
    {
        FileInfo fileToDecompress = new FileInfo(path);

        string FileName = fileToDecompress.FullName;
        string newFileName = FileName.Remove(FileName.Length - fileToDecompress.Extension.Length);

        using (FileStream decompressedFileStream = File.Create(newFileName))
        {
            using (GZipStream decompressionStream = new GZipStream(originalFileStream, CompressionMode.Decompress))
            {
                decompressionStream.CopyTo(decompressedFileStream);
            }
        }

        FileStream fs = new FileStream(newFileName, FileMode.Open);

        BinaryFormatter formatter = new BinaryFormatter();

        object[] uploadObject = (object[])formatter.Deserialize(fs);
    }
}

---

非常感谢您的光临！但它仍然给我一个错误：路径格式不受支持。当我使用此路径时：“https/：MYSTORAGEACC.blob.core.windows.net/MYCONTAINER/MYFILE”。我做错了什么？首先将文件从Azure Blob存储下载到本地，然后从本地解压并反序列化下载的文件，而不是将Blob url作为路径传递给方法DecompressAndDeserialize。非常感谢您的帮助！但它仍然给我一个错误：路径格式不受支持。当我使用此路径时：“https/：MYSTORAGEACC.blob.core.windows.net/MYCONTAINER/MYFILE”。我做错了什么？首先将文件从Azure Blob存储下载到本地，然后从本地解压缩并反序列化下载的文件，而不是将Blob url作为路径传递给方法DecompressAndDeserialize。