System.ObjectDisposedException: 'Cannot access a closed Stream.' 在 IFormFile.CopyTo

Question

我有一种情况需要从图像创建 FormFile，然后我需要从 FormFile 返回 MemoryStream。来自文件的 MemoryStream 在其他地方。我刚刚将其作为示例来产生问题。

private IFormFile ReturnFormFile(Image image, string thumbnailName)
    {
        IFormFile file = null;
        using (MemoryStream ms = new MemoryStream())
        {
            image.Save(ms, ImageFormat.Jpeg);
            file = new FormFile(ms, 0, ms.Length, "name", thumbnailName);
            ms.Seek(0, SeekOrigin.Begin);
        }
        using (System.IO.MemoryStream memStream = new System.IO.MemoryStream())
        {
            file.CopyTo(memStream);// System.ObjectDisposedException: 'Cannot access a closed Stream.'

            Byte[] fileData = memStream.ToArray();
        }
        return file;
    }

有什么建议吗

Answer 1

试试这个方法：

private IFormFile ReturnFormFile(Image image, string thumbnailName)
    {
        IFormFile file = null;
        using (MemoryStream ms = new MemoryStream())
        {
            image.Save(ms, ImageFormat.Jpeg);
            file = new FormFile(ms, 0, ms.Length, "name", thumbnailName);
            ms.Seek(0, SeekOrigin.Begin);
            using (System.IO.MemoryStream memStream = new System.IO.MemoryStream())
            {
                file.CopyTo(memStream);// System.ObjectDisposedException: 'Cannot access a closed Stream.'

                Byte[] fileData = memStream.ToArray();
            }
            return file;
        }
       
    }

System.ObjectDisposedException: 'Cannot access a closed Stream.' 在 IFormFile.CopyTo

System.ObjectDisposedException: 'Cannot access a closed Stream.' in IFormFile.CopyTo

c#

.net-core