azure - IFormFileCollection : Cannot access a Disposed Object

Question

我尝试将文档上传到 Azure Blob，但在读取文件流时抛出如下错误。

错误，

Cannot access a disposed object.
Object name: 'FileBufferingReadStream'.

调用代码 OpenReadStream() 时出现错误，

public async Task UploadAsync(IFormFileCollection files, string directoryName)
    {
        var blobContainer = await _azureBlobConnectionFactory.GetBlobContainer();
        CloudBlobDirectory directory = blobContainer.GetDirectoryReference(directoryName);
        for (int i = 0; i < files.Count; i++)
        {
            CloudBlockBlob blockblob = directory.GetBlockBlobReference(files[i].FileName);
            using (var stream = files[i].OpenReadStream())
            {
                await blockblob.UploadFromStreamAsync(stream);

            }
        }
    }

我从实际的服务类中调用 UploadAsync 方法，例如，

public async Task<bool> UploadToBlob(DocumentModel model,string directorypath)
    {
        try
        {
            //string directory = directorypath + model.EmailId + "/" + model.Files[0].FileName;
            await _blobService.UploadAsync(model.Files, "Documents/dummy.pdf");

           
            return true;
        }
        catch(Exception e)
        {
            throw e;
        }
    }

我哪里出错了？

Answer 1

• Action 方法的返回方法可能是导致此问题的原因
• 如果返回类型不是Task<T>，则会发生错误.
  您可以按如下方式修改操作方法:

[HttpPost]
public async Task<int> ActionMethod(IFormFile img)
{
     // same

     return resultValue;
}

引用文献:

1. When trying to upload file, FileBufferingReadStream.ThrowIfDisposed() error occur
2. Cannot access a disposed object. Object name: FileBufferingReadStream
3. IFormFile copy to memorystream ObjectDisposedException