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说道微信开发，感觉好久之前的事情了，大概一年前做到过，现在突然有个朋友问到我如何获取用户的openid？好吧，我找了下代码，找到了，现在在这里大概讲一下，很简单，一共分三步

1、首先去获取到接口（如下，当然你必须知道appid、secret还有code）

https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code

2、去接口get一下

helper.HttpGet(string.Format(GetVisitUserUnionidUrl, Config.GetWX_AppID(), Config.GetWX_AppSecret(), code))

在这里，我把HttpGet方法贴出来

 public string HttpGet(string Url)
        {
            var request = WebRequest.Create(Url) as HttpWebRequest;
            request.Method = "GET";
            request.ContentType = "application/x-www-form-urlencoded";
            return HttpRequest(request);
        }

3、接口返回给你的是json串，你知道获取到其中的openid就可以了

 COE.Components.Json.JsonHelper.GetJsonValue(helper.HttpGet(string.Format(GetVisitUserUnionidUrl, Config.GetWX_AppID(), Config.GetWX_AppSecret(), code)), "openid");

同样我还是把GetJsonValue方法粘贴出来

 public static string GetJsonValue(string jsonStr, string key)
        {
            string result = string.Empty;
            if (!string.IsNullOrEmpty(jsonStr))
            {
                key = "\"" + key.Trim('"') + "\"";
                int index = jsonStr.IndexOf(key) + key.Length + 1;
                if (index > key.Length + 1)
                {
                    //先截逗号，若是最后一个，截“｝”号，取最小值
                    int end = jsonStr.IndexOf(',', index);
                    if (end == -1)
                    {
                        end = jsonStr.IndexOf('}', index);
                    }

                    result = jsonStr.Substring(index, end - index);
                    result = result.Trim(new char[] { '"', ' ', '\'' }); //过滤引号或空格
                }
            }
            return result;
        }

Sorry，忘记了一个方法

private static string HttpRequest(HttpWebRequest request)
        {
            HttpWebResponse response = null;
            try
            {
                response = request.GetResponse() as HttpWebResponse;
            }
            catch (WebException ex)
            {
                response = ex.Response as HttpWebResponse;
            }
            if (response == null)
            {
                return null;
            }
            string result = string.Empty;
            using (StreamReader reader = new StreamReader(response.GetResponseStream()))
            {
                result = reader.ReadToEnd();
                reader.Close();
            }
            response.Close();
            return result;

        }