PutBlock错误:远程服务器返回错误:(400)将文件上载到Azure时出现错误请求

我面临远程服务器返回错误400的问题,将文件作为块blob上传到Azure时出现错误请求.但奇怪的是,有时代码可以用于上传特定文件,有时候它会因同一个文件而失败.

我的代码就像 -

        List blockIdList = new List();

        using (var file = new FileStream(_path, FileMode.Open, FileAccess.Read))
        {
            int blockId = 0;

            int blockSize = 4096;
            // open file
            while (file.Position < file.Length)
            {
                // calculate buffer size (blockSize in KB)   
                long bufferSize = blockSize * 1024 < file.Length - file.Position ? blockSize * 1024 : file.Length - file.Position;
                byte[] buffer = new byte[bufferSize];
                // read data to buffer
                file.Read(buffer, 0, buffer.Length);
                // save data to memory stream and put to storage
                using (var stream = new MemoryStream(buffer))
                {
                    // set stream position to start
                    stream.Position = 0;
                     convert block id to Base64 Encoded string      
                    var blockIdBase64 = Convert.ToBase64String(System.BitConverter.GetBytes(blockId));

                    blockBlob.PutBlock(blockIdBase64, stream, null);
                    blockIdList.Add(blockIdBase64);
                    // increase block id
                    blockId++;
                }
            }

            blockBlob.PutBlockList(blockIdList);

            file.Close();
        } 

不知道为什么这个错误正在抛出并寻找可能的解决方案.

谢谢