Office 2016 中的 MailItem.GetInspector.WordEditor 生成应用程序定义或对象定义的错误

csharp
using Outlook = Microsoft.Office.Interop.Outlook;
using word = Microsoft.Office.Interop.word;
public void EditMAIlBody(Outlook.MAIlItem mAIlItem)
{
    Outlook.Inspector inspector = mAIlItem.GetInspector;
    word.Document wordDoc = inspector.wordEditor as word.Document;
    
    if (wordDoc != null)
    {
        // 在邮件正文中插入文本
        wordDoc.Content.Text = "这是一封测试邮件";
        
        // 格式化邮件正文
        wordDoc.Content.Font.Size = 12;
        wordDoc.Content.Font.Bold = true;
        
        // 保存并关闭word编辑器
        wordDoc.Save();
        wordDoc.Close();
    }
}