C#开发Outlook VSTO插件如何获取阅读窗格中预览的邮件？

架构老林

2026-9-26

解决方案

核心原理

Outlook 中独立打开的邮件窗口对应 Inspector 对象，包含邮件列表、阅读窗格的主界面对应 Explorer 对象
阅读窗格当前预览的邮件，就是主界面选中列表的首个 MailItem 对象

兼容双场景的实现代码

using Microsoft.Office.Interop.Outlook;
using System.Runtime.InteropServices;

// ......

MailItem targetMail = null;
Inspector activeInspector = null;
Explorer activeExplorer = null;

try
{
    // 优先读取独立窗口打开的邮件
    activeInspector = Globals.ThisAddIn.Application.ActiveInspector();
    if (activeInspector != null && activeInspector.CurrentItem is MailItem inspectorMail)
    {
        targetMail = inspectorMail;
    }
    else
    {
        // 无独立窗口时读取阅读窗格预览的邮件
        activeExplorer = Globals.ThisAddIn.Application.ActiveExplorer();
        if (activeExplorer != null && activeExplorer.Selection.Count > 0)
        {
            object selectedItem = activeExplorer.Selection[1];
            if (selectedItem is MailItem explorerMail)
            {
                targetMail = explorerMail;
            }
        }
    }

    if (targetMail != null)
    {
        // 你的原有业务逻辑：保存邮件、打包为附件发送等
        string path = @"C:\Test\Mail.msg";
        targetMail.SaveAs(path, OlSaveAsType.olMSG);
        // 后续发送新邮件的逻辑写在此处
    }
}
finally
{
    // 手动释放COM对象避免内存泄漏
    if (targetMail != null) Marshal.ReleaseComObject(targetMail);
    if (activeInspector != null) Marshal.ReleaseComObject(activeInspector);
    if (activeExplorer != null) Marshal.ReleaseComObject(activeExplorer);
}