private async Task ShareToWeixinAsync(string name)
{
shareType = name == "WeixinShare" ?
ShareType.WechatSession :
ShareType.WechatTimeLine;
var doc = new HtmlDocument();
doc.LoadHtml(nativeString);
var bytes = await SDKHelpers.ReadResFromImageAsync(thumb);
await SDKHelpers.SendWechatShareToUserChoiceRequestAsync(
url : currentUri.ToString(),
title : title,
thumb : bytes,
desc : description,
toTimeLine : shareType);
}