Aspose PDF从byte [] []合并PDF(Aspose PDF Merge PDF from byte[][])

 我正在开发一种服务，将多个PDF文件作为varbinary存储在数据库中，并使用Aspose - PDF将它们合并到一个文件中。 然后将合并的文件转换为Memory Stream ，然后转换为blob ，然后发送到网页。 
 
 这是我的服务： 
 
    public MemoryStream GetPrintContent(List<ConfirmationRequestNoticeViewModel> models)
    {
        // Instantiate Pdf instance by calling its empty constructor
        Document pdf1 = new Document();

        byte[][] bytes = new byte[models.Count][];

        for (int i = 0; i < models.Count; i++)
        {
            ConfirmationRequestNoticeViewModel model = models[i];
            byte[] fileContent = _dataService.GetPrintContent(model.ConfirmationRequestId);
            bytes[i] = fileContent;

        }
        MemoryStream stream = new MemoryStream();
        List<Document> documents = GeneratePdfs(bytes, stream);
        stream = ConcatenatePdf(documents);
        return stream;
    }

    private MemoryStream ConcatenatePdf(List<Document> documents)
    {
        MemoryStream stream = new MemoryStream();
        Document mergedPdf = documents[0];
        for(int index = 1; index < documents.Count; index++)
        {
            for (int i = 0; i < documents[index].Pages.Count; i++)
            {
                mergedPdf.Pages.Add(documents[index].Pages[i + 1]);
            }
        }
        mergedPdf.Save(stream);
        return stream;
    }

    private List<Document> GeneratePdfs(byte[][] content, MemoryStream stream)
    {
        List<Document> documents = new List<Document>();
        Document pdf = new Document();
        foreach (byte[] fileContent in content)
        {
            using (MemoryStream fileStream = new MemoryStream(fileContent))
            {
                pdf = new Document(fileStream);
                pdf.Save(stream);
                documents.Add(pdf);
            }
        }
        return documents;
    }
 
 除了mergedPdf.Save(stream);行之外，一切都很好mergedPdf.Save(stream); 它返回错误无法访问封闭的流 。 
 
 我一直在研究这一点，似乎无法理解为什么记忆流已关闭。 有其他人遇到过这个问题吗？ 
 
 编辑： 
 
 我发现这里列出的问题 

I'm working on a service that pulls multiple PDF files stored in a database as varbinary and merges them into a single file using Aspose - PDF. The merged file is then converted to a Memory Stream and then a blob and then sent to the webpage.
 
Here's my service:
 
    public MemoryStream GetPrintContent(List<ConfirmationRequestNoticeViewModel> models)
    {
        // Instantiate Pdf instance by calling its empty constructor
        Document pdf1 = new Document();

        byte[][] bytes = new byte[models.Count][];

        for (int i = 0; i < models.Count; i++)
        {
            ConfirmationRequestNoticeViewModel model = models[i];
            byte[] fileContent = _dataService.GetPrintContent(model.ConfirmationRequestId);
            bytes[i] = fileContent;

        }
        MemoryStream stream = new MemoryStream();
        List<Document> documents = GeneratePdfs(bytes, stream);
        stream = ConcatenatePdf(documents);
        return stream;
    }

    private MemoryStream ConcatenatePdf(List<Document> documents)
    {
        MemoryStream stream = new MemoryStream();
        Document mergedPdf = documents[0];
        for(int index = 1; index < documents.Count; index++)
        {
            for (int i = 0; i < documents[index].Pages.Count; i++)
            {
                mergedPdf.Pages.Add(documents[index].Pages[i + 1]);
            }
        }
        mergedPdf.Save(stream);
        return stream;
    }

    private List<Document> GeneratePdfs(byte[][] content, MemoryStream stream)
    {
        List<Document> documents = new List<Document>();
        Document pdf = new Document();
        foreach (byte[] fileContent in content)
        {
            using (MemoryStream fileStream = new MemoryStream(fileContent))
            {
                pdf = new Document(fileStream);
                pdf.Save(stream);
                documents.Add(pdf);
            }
        }
        return documents;
    }
 
Everything is working great except for the line mergedPdf.Save(stream); which returns the error Cannot access a closed stream.
 
I've been working on this and can't seem to understand why the Memory Stream has been closed. Has anyone else encountered this issue?
 
Edit:
 
I've found the issue listed here

原文：https://stackoverflow.com/questions/41554951