c# – 抑制Outlook字段打印

取消Outlook用户字段打印

static void SuppressUserPropertyPrinting(Outlook.MailItem message)
{
    try
    {   // Late Binding in .NET: https://support.microsoft.com/en-us/kb/302902
        Type userPropertyType;
        long dispidMember = 107;
        long ulPropPrintable = 0x4; // removes PDO_PRINT_SAVEAS
        string dispMemberName = String.Format("[DispID={0}]",dispidMember);
        object[] dispParams;

        if (message.UserProperties.Count == 0) return; // no props found (exit)

        // marks all user properties as suppressed
        foreach (Outlook.UserProperty userProperty in message.UserProperties.Cast<Outlook.UserProperty>())
        {
            if (userProperty == null) continue; // no prop found (go to next)
            userPropertyType = userProperty.GetType(); // user property type

            // Call IDispatch::Invoke to get the current flags
            object flags = userPropertyType.InvokeMember(dispMemberName,BindingFlags.GetProperty,null,userProperty,null);
            long lFlags = long.Parse(flags.ToString()); // default is 45 - PDO_IS_CUSTOM|PDO_PRINT_SAVEAS|PDO_PRINT_SAVEAS_DEF (ref: http://msdn.microsoft.com/en-us/library/ee415114.aspx)

            // Remove the hidden property Printable flag
            lFlags &= ~ulPropPrintable; // change to 41 - // PDO_IS_CUSTOM|PDO_PRINT_SAVEAS_DEF (ref: http://msdn.microsoft.com/en-us/library/ee415114.aspx)

            // Place the new flags property into an argument array
            dispParams = new object[] { lFlags };

            // Call IDispatch::Invoke to set the current flags
            userPropertyType.InvokeMember(dispMemberName,BindingFlags.SetProperty,dispParams);
        }
    }
    catch { } // safely ignore if property suppression doesn't work
}