Azure存储:上载的文件大小为零字节

当我将图像文件上载到blob时,图像显然已成功上载(没有错误)。当我进入CloudStorageStudio时,文件就在那里,但大小为0(零)字节。

以下是我使用的代码:

// These two methods belong to the ContentService class used to upload
// files in the storage.
public void SetContent(HttpPostedFileBase file, string filename, bool overwrite)
{
    CloudBlobContainer blobContainer = GetContainer();
    var blob = blobContainer.GetBlobReference(filename);

    if (file != null)
    {
        blob.Properties.ContentType = file.ContentType;
        blob.UploadFromStream(file.InputStream);
    }
    else
    {
        blob.Properties.ContentType = "application/octet-stream";
        blob.UploadByteArray(new byte[1]);
    }
}

public string UploadFile(HttpPostedFileBase file, string uploadPath)
{
    if (file.ContentLength == 0)
    {
        return null;
    }

    string filename;
    int indexBar = file.FileName.LastIndexOf('\\');
    if (indexBar > -1)
    {
        filename = DateTime.UtcNow.Ticks + file.FileName.Substring(indexBar + 1);
    }
    else
    {
        filename = DateTime.UtcNow.Ticks + file.FileName;
    }
    ContentService.Instance.SetContent(file, Helper.CombinePath(uploadPath, filename), true);
    return filename;
}

// The above code is called by this code.
HttpPostedFileBase newFile = Request.Files["newFile"] as HttpPostedFileBase;
ContentService service = new ContentService();
blog.Image = service.UploadFile(newFile, string.Format("{0}{1}", Constants.Paths.BlogImages, blog.RowKey));

在将图像文件上载到存储之前,来自httpPostedFileBase的属性inputstream似乎很好(图像的大小与预期的大小相对应!)不会抛出异常)。

而真正奇怪的是,这在其他情况下(从工作者角色上传功率点,甚至其他图像)也能很好地工作。调用setcontent方法的代码似乎完全相同,并且文件似乎是正确的,因为在正确的位置创建了一个零字节的新文件。

有人有什么建议吗?我调试了这段代码很多次,但看不到问题所在。欢迎提出任何建议!

谢谢