如何将 OpenXML 从模板创建的 Word 文档转换为 MemoryStream？

Question

我需要在 ASP.NET 控制器方法中将文档作为 MemoryStream 返回以在网页上下载它。我不想把这个文档保存在文件上，然后把它读成 MemoryStream 并返回。注意：重载方法 WordprocessingDocument.CreateFromTemplate(template) 没有流选项 vs WordprocessingDocument.Create(stream, ...)

保存临时文件的解决方案如下。

    public static MemoryStream GetWordDocumentFromTemplate()
    {
        string tempFileName = Path.GetTempFileName();
        var templatePath = AppDomain.CurrentDomain.BaseDirectory + @"Controllers\" + templateFileName;

        using (var document = WordprocessingDocument.CreateFromTemplate(templatePath))
        {
            var body = document.MainDocumentPart.Document.Body;

            //add some text 
            Paragraph paraHeader = body.AppendChild(new Paragraph());
            Run run = paraHeader.AppendChild(new Run());
            run.AppendChild(new Text("This is body text"));

            OpenXmlPackage savedDoc = document.SaveAs(tempFileName); // Save result document, not modifying the template
            savedDoc.Close();  // can't read if it's open
            document.Close();
        }

        var memoryStream = new MemoryStream(File.ReadAllBytes(tempFileName)); // this works but I want to avoid saving and reading file

        //memoryStream.Position = 0; // should I rewind it? 
        return memoryStream;
    }

Answer 1

找到了无需保存到中间临时文件即可工作的答案。技巧是打开模板进行编辑，使用可访问的流，将文档类型从模板更改为文档，然后返回此流。

public static MemoryStream GetWordDocumentStreamFromTemplate()
{
    var templatePath = AppDomain.CurrentDomain.BaseDirectory + "Controllers\\" + templateFileName;
    var memoryStream = new MemoryStream();

    using (var fileStream = new FileStream(templatePath, FileMode.Open, FileAccess.Read))
        fileStream.CopyTo(memoryStream);

    using (var document = WordprocessingDocument.Open(memoryStream, true))
    {
        document.ChangeDocumentType(WordprocessingDocumentType.Document); // change from template to document

        var body = document.MainDocumentPart.Document.Body;

        //add some text 
        Paragraph paraHeader = body.AppendChild(new Paragraph());
        Run run = paraHeader.AppendChild(new Run());
        run.AppendChild(new Text("This is body text"));

        document.Close();
    }

    memoryStream.Position = 0; //let's rewind it
    return memoryStream;
}

完整测试解决方案：https : //github.com/sergeklokov/WordDocumentByOpenXML/blob/master/WordDocumentByOpenXML/Program.cs