public static async Task ReportError(string feedbackText, string qqText)
        {
            const string to      = "*****@*****.**";
            const string subject = "《饥荒百科全书 by tpxxn》意见与建议";
            var          body    = feedbackText;

            if (qqText != null)
            {
                body += " QQ:" + qqText;
            }
            await CallExternalContent.OpenEmailComposeAsync(to, subject, body);
        }