C# 从 OpenXML 返回内存流，导致损坏的 Word 文件

我对来自 OpenXML 的 MemoryStream 有疑问。如果我在一个方法中完成所有步骤，我可以成功打开 Word 文件、更改它并通过 HttpResponse 下载它。

但是，如果我尝试通过返回 MemoryStream 在两个不同的类（或方法）中执行此操作，则会得到损坏的 Word 文件。我考虑过冲洗或缓冲问题，但没有找到解决方案。

这是工作代码：

    public void FillTemplateOpenXmlWord(HttpResponse response)
    {
        string filePath = @"c:\template.docx";
        byte[] filebytes = File.ReadAllBytes(filePath);

        using (MemoryStream stream = new MemoryStream(filebytes))
        {
            using (WordprocessingDocument myDoc = WordprocessingDocument.Open(stream, true))
            {
                // do some changes
                ...
                myDoc.MainDocumentPart.Document.Save();
            }

            string docx = "docx";
            response.Clear();
            response.ClearHeaders();
            response.ClearContent();
            response.AddHeader("content-disposition", "attachment; filename=\"" + docx + ".docx\"");
            response.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
            response.ContentEncoding = Encoding.GetEncoding("ISO-8859-1");
            stream.Position = 0;
            stream.CopyTo(response.OutputStream);
            response.End();
        }
    }

这是非工作代码：

    public void OpenFile(HttpResponse response)
    {
        MemoryStream stream = this.FillTemplateOpenXmlWord();

        string docx = "docx";
        response.Clear();
        response.ClearHeaders();
        response.ClearContent();
        response.AddHeader("content-disposition", "attachment; filename=\"" + docx + ".docx\"");
        response.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
        response.ContentEncoding = Encoding.GetEncoding("ISO-8859-1");
        stream.Position = 0;
        stream.CopyTo(response.OutputStream);
        response.End();
    }

    public MemoryStream FillTemplateOpenXmlWord()
    {
        string filePath = @"c:\template.docx";
        byte[] filebytes = File.ReadAllBytes(filePath);

        using (MemoryStream stream = new MemoryStream(filebytes))
        {
            using (WordprocessingDocument myDoc = WordprocessingDocument.Open(stream, true))
            {
                // do some changes
                ...
                myDoc.MainDocumentPart.Document.Save();
            }

            return stream;
        }
    }

任何想法 ？

谢谢

这是我用来从内存流生成 OpenXML 文件的方法。在本例中，它从服务器上的模板生成 XLSX 文件，但对于其他 OpenXml 格式应该类似。

控制器动作：

public class ExportController : Controller
{
    public FileResult Project(int id)
    {
        var model = SomeDateModel.Load(id); 
        ProjectExport export = new ProjectExport();
        var excelBytes = export.Export(model);
        FileResult fr = new FileContentResult(excelBytes, "application/vnd.ms-excel")
        {
            FileDownloadName = string.Format("Export_{0}_{1}.xlsx", DateTime.Now.ToString("yyMMdd"), model.Name)
        };

        return fr;
    }
}

// 辅助类

public class ProjectExport
{
    private WorkbookPart workbook;
    private Worksheet ws;

    public byte[] Export(SomeDateModel model)
    {
        var template = new FileInfo(HostingEnvironment.MapPath(@"~\Export\myTemplate.xlsx"));
        byte[] templateBytes = File.ReadAllBytes(template.FullName);

        using (var templateStream = new MemoryStream())
        {
            templateStream.Write(templateBytes, 0, templateBytes.Length);
            using (var excelDoc = SpreadsheetDocument.Open(templateStream, true))
            {
                workbook = excelDoc.WorkbookPart;
                var sheet = workbook.Workbook.Descendants<Sheet>().First();

                ws = ((WorksheetPart)workbook.GetPartById(sheet.Id)).Worksheet;

                sheet.Name = model.Name;
                // Here write some other stuff for setting values in cells etc...
            }
            templateStream.Position = 0;
            var result = templateStream.ToArray();
            templateStream.Flush();

            return result;
        }
    }