迁移至WindowsServer2019后Microsoft.Office.Interop.Word无法打开文件且无报错

我有一个在Windows Server 2012上稳定运行8年的Web应用，通过Microsoft.Office.Interop实现Office自动化，仅用于内网场景下将Excel/Word文档转换为PDF，再用iTextSharp合并成单个PDF。迁移到Windows Server 2019后，文件无法打开，应用无任何错误抛出，一直处于等待服务器响应的状态。

已知微软不推荐这种Office自动化方案，但应用此前长期稳定运行。浏览器持续等待的现象推测是Office弹出了未被捕获的确认提示框，尽管已在组件服务中配置了应用运行的用户身份，且该身份下手动运行Office无首次运行提示。

对比新旧环境后判断问题可能出在Office的文档打开行为：旧环境以编辑模式打开只读文档，新环境则以受限只读模式打开（可能导致无法使用“另存为”功能），且无法通过Office选项修改该行为。

旧环境中可正常运行的代码如下：

public void Indexchanged_ConvertWordPDF(Object sender, EventArgs e)
{
    Microsoft.Office.Interop.Word.Application xlApp = new Microsoft.Office.Interop.Word.Application();
    object missing = System.Type.Missing;
    xlApp.AutomationSecurity = Microsoft.Office.Core.MsoAutomationSecurity.msoAutomationSecurityForceDisable;
    xlApp.DisplayAlerts = WdAlertLevel.wdAlertsNone;

    xlApp.Visible = false;
    
    string path = Gridview_SO.SelectedRow.Cells[0].Text;

    string CertName = Gridview_SO.SelectedDataKey.Value.ToString().Replace("/", "-");

    Microsoft.Office.Interop.Word._Document wordDocument = xlApp.Documents.Open(path, false, false, ref missing, ref missing);

    wordDocument.ExportAsFixedFormat(@"C:\pdf\" + SALESID.Text + "_" + CertName + ".pdf", Microsoft.Office.Interop.Word.WdExportFormat.wdExportFormatPDF);

    object doNotSaveChanges = Microsoft.Office.Interop.Word.WdSaveOptions.wdDoNotSaveChanges;
    wordDocument.Close(ref doNotSaveChanges, ref missing, ref missing);
    xlApp.Quit();

    DownloadSinglePDF(CertName);

    GC.Collect();
    GC.WaitForPendingFinalizers();
}

针对Windows Server 2019上Office Interop的文档打开问题，可尝试以下调整：

1. 修改文档打开参数，强制以编辑模式打开 #

在Documents.Open方法中，明确设置参数强制以可编辑模式打开文档，绕过受限只读限制：

// 显式指定参数，强制编辑模式打开并启用自动修复
Microsoft.Office.Interop.Word._Document wordDocument = xlApp.Documents.Open(
    FileName: path,
    ConfirmConversions: false,
    ReadOnly: false,
    AddToRecentFiles: false,
    PasswordDocument: missing,
    PasswordTemplate: missing,
    Revert: false,
    WritePasswordDocument: missing,
    WritePasswordTemplate: missing,
    Format: WdOpenFormat.wdOpenFormatAuto,
    Encoding: missing,
    Visible: false,
    OpenAndRepair: true,
    DocumentDirection: WdDocumentDirection.wdLeftToRight,
    NoEncodingDialog: true,
    XMLTransform: missing
);

2. 补充静默配置，避免潜在弹窗 #

除已有的配置外，添加以下设置禁用Office的各类提示：

// 禁用自动宏运行
xlApp.WordBasic.DisableAutoMacros();
// 关闭阅读模式，强制编辑视图
xlApp.Options.AllowReadingMode = false;
// 设置默认保存格式，避免兼容提示
xlApp.DefaultSaveFormat = WdSaveFormat.wdFormatDocumentDefault;

3. 检查用户环境与权限 #

• 确认应用运行用户对C:\pdf目录有完全读写权限，对源文档路径有读取权限
• 以该用户身份登录服务器，手动打开目标文档，确认无信任中心、格式兼容或激活类提示
• 关闭Office受保护视图：打开Word → 文件 → 选项 → 信任中心 → 信任中心设置 → 受保护视图，取消所有勾选选项

4. 新增异常捕获与进程清理 #

添加异常捕获并强制输出日志，同时确保Office进程正常退出：

public void Indexchanged_ConvertWordPDF(Object sender, EventArgs e)
{
    Microsoft.Office.Interop.Word.Application xlApp = null;
    Microsoft.Office.Interop.Word._Document wordDocument = null;
    object missing = System.Type.Missing;
    try
    {
        xlApp = new Microsoft.Office.Interop.Word.Application();
        xlApp.AutomationSecurity = Microsoft.Office.Core.MsoAutomationSecurity.msoAutomationSecurityForceDisable;
        xlApp.DisplayAlerts = WdAlertLevel.wdAlertsNone;
        xlApp.Visible = false;
        // 新增静默配置
        xlApp.WordBasic.DisableAutoMacros();
        xlApp.Options.AllowReadingMode = false;

        string path = Gridview_SO.SelectedRow.Cells[0].Text;
        string CertName = Gridview_SO.SelectedDataKey.Value.ToString().Replace("/", "-");

        // 修改打开参数
        wordDocument = xlApp.Documents.Open(
            path, false, false, ref missing, ref missing, ref missing,
            ref missing, ref missing, ref missing, ref missing, ref missing,
            false, true, ref missing, true, ref missing
        );

        wordDocument.ExportAsFixedFormat(@"C:\pdf\" + SALESID.Text + "_" + CertName + ".pdf", 
            Microsoft.Office.Interop.Word.WdExportFormat.wdExportFormatPDF);

        object doNotSaveChanges = Microsoft.Office.Interop.Word.WdSaveOptions.wdDoNotSaveChanges;
        wordDocument.Close(ref doNotSaveChanges, ref missing, ref missing);
        xlApp.Quit();

        DownloadSinglePDF(CertName);
    }
    catch (Exception ex)
    {
        // 写入错误日志便于排查
        System.IO.File.WriteAllText(@"C:\pdf\interop_error.log", $"[{DateTime.Now}] {ex.ToString()}");
        // 强制清理Office进程
        if (wordDocument != null)
        {
            object doNotSave = Microsoft.Office.Interop.Word.WdSaveOptions.wdDoNotSaveChanges;
            wordDocument.Close(ref doNotSave, ref missing, ref missing);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(wordDocument);
        }
        if (xlApp != null)
        {
            xlApp.Quit();
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
        }
        throw;
    }
    finally
    {
        GC.Collect();
        GC.WaitForPendingFinalizers();
    }
}

内容的提问来源于stack exchange，提问作者Barnabeck