使用 Outlook 生成多封邮件

Question

我想用 Outlook 向多个客户发送电子邮件。为此，我的程序中有一个方法可以迭代收件人、编写消息正文并将第一条消息显示为预览。

这是该方法的简化版本：

public void CreateMails(List<InfoMailRecipient> recipients)
{
    Microsoft.Office.Interop.Outlook.Application outlook = new Microsoft.Office.Interop.Outlook.Application();
    foreach (InfoMailRecipient recipient in recipients)
    {
        MailItem mail = outlook.CreateItem(OlItemType.olMailItem);
        mail.SentOnBehalfOfName = "Sending User";
        mail.BCC = recipient.EMailAddress;

        mail.Subject = "TEST";
        mail.BodyFormat = OlBodyFormat.olFormatHTML;
        mail.HTMLBody = "<html><body>test</body></html>";
        mail.Display(true);
    }
}

当显示Outlook消息window时，无论我只是关闭window还是点击"Send"，都会立即创建下一个MailItem我得到一个异常 "RPC Server unavailable"。显然是因为 Outlook 已关闭。我发现当我删除行时

mail.Display(true);

只需调用 .Send();，所有消息都已正确发送。但随后 Outlook 保持打开状态。即使我在 foreach 循环之后调用 .Quit()。

如何正确处理这个 Outlook 实例？

更新 1 - 手动 GC 调用

public void CreateMails(List<InfoMailRecipient> recipients)
{
    Microsoft.Office.Interop.Outlook.Application outlook = new Microsoft.Office.Interop.Outlook.Application();
    foreach (InfoMailRecipient recipient in recipients)
    {
        MailItem mail = outlook.CreateItem(OlItemType.olMailItem);
        mail.SentOnBehalfOfName = "Sending User";
        mail.BCC = recipient.EMailAddress;

        mail.Subject = "TEST";
        mail.BodyFormat = OlBodyFormat.olFormatHTML;
        mail.HTMLBody = "<html><body>test</body></html>";
        mail.Send();
    }
    outlook.Quit();
    GC.Collect();
    GC.WaitForPendingFinalizers();
}

Outlook 保持运行.

Answer 1

这似乎有效 - 你能告诉我们它是否也适合你吗？

    public static void Main(string[] args)
    {
        CreateMails(new List<string>() {"emailaddresshere"});
        Console.WriteLine("finished");
        Console.ReadLine();
    }

    public static void CreateMails(List<string> recipients)
    {
        Microsoft.Office.Interop.Outlook.Application outlook = new Microsoft.Office.Interop.Outlook.Application();
        foreach (string recipient in recipients)
        {
            MailItem mail = outlook.CreateItem(OlItemType.olMailItem);
            mail.SentOnBehalfOfName = "Sending User";
            mail.BCC = recipient;

            mail.Subject = "TEST";
            mail.BodyFormat = OlBodyFormat.olFormatPlain;
            mail.HTMLBody = "Hello";
            mail.Send();
            System.Runtime.InteropServices.Marshal.ReleaseComObject(mail); // key change
        }
        GC.Collect();
        GC.Collect();
        GC.WaitForPendingFinalizers();
        outlook.Application.Quit();
        outlook.Quit();
        System.Runtime.InteropServices.Marshal.ReleaseComObject(outlook); // key change
        outlook = null;
        GC.Collect();
        GC.Collect();
        GC.WaitForPendingFinalizers();
    }

另请阅读 https://ausdotnet.wordpress.com/category/technical/com-interop/ and 。

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