c# - Windows Azure : Storage Client Exception Unhandled

Question

我正在编写一个代码，用于使用 block 将大文件上传到 blob...当我测试它时，它给了我一个 StorageClientException

它指出:请求输入之一超出范围。

我在这行代码中遇到了这个异常:

blob.PutBlock(block, ms, null);

这是我的代码:

protected void ButUploadBlocks_click(object sender, EventArgs e)
        {

            // store upladed file as a blob storage
            if (uplFileUpload.HasFile)
            {
                name = uplFileUpload.FileName;
                byte[] byteArray = uplFileUpload.FileBytes;
                Int64 contentLength = byteArray.Length;
                int numBytesPerBlock = 250 *1024; // 250KB per block
                int blocksCount = (int)Math.Ceiling((double)contentLength / numBytesPerBlock);  // number of blocks 
                MemoryStream ms ;
                List<string>BlockIds = new List<string>();
                string block;
                int offset = 0;

                // get refernce to the cloud blob container
                CloudBlobContainer blobContainer = cloudBlobClient.GetContainerReference("documents");

                // set the name for the uploading files
                string UploadDocName = name;

                // get the blob reference and set the metadata properties
                CloudBlockBlob blob = blobContainer.GetBlockBlobReference(UploadDocName);
                blob.Properties.ContentType = uplFileUpload.PostedFile.ContentType;

                for (int i = 0; i < blocksCount; i++, offset = offset + numBytesPerBlock)
                {
                    block = Convert.ToBase64String(BitConverter.GetBytes(i));
                    ms = new MemoryStream();
                    ms.Write(byteArray, offset, numBytesPerBlock);

                    blob.PutBlock(block, ms, null);
                    BlockIds.Add(block);
                }

                blob.PutBlockList(BlockIds);

                blob.Metadata["FILETYPE"] = "text";
            }
        }

谁能告诉我如何解决这个问题...

Answer 1

我认为您必须执行 ms.Position = 0 才能在上传之前将流恢复到开头。 (否则，PutBlock 可能会尝试从流中读取并发现它已经在末尾了。)