需要的类 用于反序列化

public class GuanZhuModel2
{
    public int total { get; set; }
    public int count { get; set; }
    public OpenIdListData data { get; set; }
    public string next_openid { get; set; }
}
public class OpenIdListData
{
    /// 

    /// OPENID的列表
    /// 
    public List openid { get; set; }
}

具体方法：

string returnStr = HttpUtil.Send("", "https://api.weixin.qq.com/cgi-bin/user/get?access_token=" + Convert.ToString(PayCenter.getCache("wxModelAccess")) + "&next_openid=");
       
        var obj = JsonConvert.DeserializeObject(returnStr);
        for (int i = 0; i < obj.data.openid.Count; i++)
        {
            var openid = Convert.ToString(obj.data.openid[i]);
            UserOpen openmodel = new UserOpenDAL().GetOpenIDOrType(openid, 1);
            new WXAPICommon(null, null, null).ReturnTxt(openid, "尊敬的用户,由于惠号网帐户体系升级,您的帐户类型已变更！");
            if (openmodel == null)
            {
                WeiXinCommon.GuanZhuList.Add(new GuanZhuModel()
                {
                    fromUserName = openid,
                    EventKey = ""
                });
            }
        }