/// <summary>
/// 授权并跳转
/// </summary>
/// <param name="code">用户同意授权后，返回的code，用于获取access_token获取用户信息</param>
/// <param name="state">state参数，这里传递公众号id</param>
/// <param name="returnUrl"></param>
public IActionResult AuthorizeUrl(string code, string state, string returnUrl)
{
if (string.IsNullOrWhiteSpace(code) || code == "authdeny")
{
return(Content("授权失败"));
}
var url = _authSrv.Authorize(code, returnUrl);
return(Redirect(url));
}