/**
* 返回带{@code state}参数的授权url，授权回调时会带上这个{@code state}
*
* @param state state 验证授权流程的参数，可以防止csrf
* @return 返回授权地址
* @since 1.9.3
*/
public override string Authorize(string state)
{
return(UrlBuilder.FromBaseUrl(source.Authorize())
.QueryParam("appid", config.ClientId)
.QueryParam("redirect_uri", GlobalAuthUtil.UrlEncode(config.RedirectUri))
.QueryParam("response_type", "code")
.QueryParam("scope", config.Scope.IsNullOrWhiteSpace() ? "snsapi_userinfo" : config.Scope)
.QueryParam("state", GetRealState(state) + "#wechat_redirect")
.Build());
}