检查当前用户是否为exchange通讯组列表的成员- Outlook C#

using Outlook = Microsoft.Office.Interop.Outlook;

public bool IsUserInDistributionList(string distributionListName)
{
    Outlook.Application outlookApp = new Outlook.Application();
    Outlook.AddressList addressList = outlookApp.Session.AddressLists["全局通讯列表"];
    Outlook.AddressEntry currentUser = outlookApp.Session.CurrentUser.AddressEntry;
    bool isInDistributionList = false;

    if (addressList != null && currentUser != null)
    {
        Outlook.ExchangeDistributionList distributionList = addressList.AddressEntries[distributionListName].GetExchangeDistributionList();
        if (distributionList != null)
        {
            foreach (Outlook.AddressEntry member in distributionList.GetExchangeDistributionListMembers())
            {
                if (member.Name == currentUser.Name)
                {
                    isInDistributionList = true;
                    break;
                }
            }
        }
    }

    return isInDistributionList;
}