C# 合併兩個 word 示範

和 C# 使用 Open XML SDK 2.5 輸出 Word 文件 這篇一樣， 先使用 NuGet 安裝 DocumentFormat.OpenXml 套件，或是使用 .NET CLI 執行以下指令安裝

	
dotnet add package DocumentFormat.OpenXml --version 2.19.0
    

讀取 Word 文件到 MemoryStream：

    
    public MemoryStream GetWordTemplate()
    {
        var filePath = GetWordTemplateFilePath();
        using FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
        MemoryStream memoryStream = new MemoryStream();
        fileStream.CopyTo(memoryStream);

        memoryStream.Position = 0;
        return memoryStream;
    }
    

將兩個 MemoryStream 合併：

    
    public static MemoryStream MergeWordDocuments(this MemoryStream[] stream)
    {
        MemoryStream mergedStream = new MemoryStream();

        using var myDoc = WordprocessingDocument.Create(mergedStream, WordprocessingDocumentType.Document, true);
        MainDocumentPart mainPart = myDoc.AddMainDocumentPart();
        mainPart.Document = new Document();
        Body body = mainPart.Document.AppendChild(new Body());

        stream.ToList().ForEach(x =>
        {
            AppendDocumentToBody(x, body);
        });

        mergedStream.Position = 0;
        return mergedStream;
    }

    private static void AppendDocumentToBody(MemoryStream stream, Body body)
    {
        using WordprocessingDocument wordDoc = WordprocessingDocument.Open(stream, true);
        var enumerable = wordDoc.MainDocumentPart?.Document.Body?.Elements();
        if (enumerable == null) return;
        foreach (var element in enumerable)
        {
            body.Append(element.CloneNode(true));
        }
    }
    

最後要將 MemoryStream 儲存成檔案也很簡單：

    
File.WriteAllBytes("my.docx", memoryStream.ToArray());