标签：开发 grant class .text utf8 log div sns put
获取openid流程为首先根据微信开发参数构造AuthorizeUrl认证链接，用户跳转到该链接进行授权，授权完成将跳转到回调页（首次认证需要授权，后面将直接再跳转至回调页），此时回调页中带上一个GET参数code，使用该code请求微信接口得到用户的openid。话不多说，直接上代码。
1.编写认证类OAuth
public class OAuth
{
public static HttpClient httpClient = new HttpClient();
public static string GetAuthorizeUrl(string appId, string redirectUrl, string state= "state", string scope = "snsapi_base", string responseType = "code")
{
if (!string.IsNullOrEmpty(redirectUrl))
{
redirectUrl = HttpUtility.UrlEncode(redirectUrl, System.Text.Encoding.UTF8);
}
else
{
redirectUrl = null;
}
object[] args = new object[] { appId, redirectUrl, responseType, scope, state };
return string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type={2}&scope={3}&state={4}#wechat_redirect", args);
}
public static string GetOpenIdUrl(string appId, string secret, string code, string grantType = "authorization_code")
{
object[] args = new object[] { appId, secret, code, grantType };
string requestUri = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type={3}", args);
return requestUri;
}
/// <summary>
/// 获取openid
/// </summary>
/// <param name="appId"></param>
/// <param name="secret"></param>
/// <param name="code"></param>
/// <param name="grantType"></param>
/// <returns></returns>
public static string GetOpenid(string appId, string secret, string code, string grantType = "authorization_code")
{
string requestUri = GetOpenIdUrl(appId, secret, code, grantType);
var responseStr = httpClient.GetAsync(requestUri).Result.Content.ReadAsStringAsync().Result;
var obj = JsonConvert.DeserializeObject<Dictionary<string, string>>(responseStr);
string openid = string.Empty;
if (!obj.TryGetValue("openid", out openid))
{
Log.Info($"获取openid失败appId={appId}，secret={secret}，code={code}");
}
return openid;
}
}
2.在控制器中使用认证类获取用户openid,注意：访问该控制器地址确保微信回调时候也能访问到该地址
/// <summary>
/// 获取微信openid
/// </summary>
/// <param name="code"></param>
/// <returns></returns>
[HttpGet]
public IActionResult GetWxOpenid(string code)
{
WxPayConfig wxPayConfig = new WxPayConfig();
//首先构造微信请求授权url，重定向到该url中，其中redirectUrl是回调地址，必须保证该地址在公网上能访问，本例子构造的是返回到本控制器的方法。
//若是从微信授权返回进入该方法，则会带上一个参数，code就不为空，若code为空则跳转微信授权
if (string.IsNullOrEmpty(code))
{
var redirectUrl = OAuth.GetAuthorizeUrl(wxPayConfig.appid, "回调地址到公网本Action");
return Redirect(redirectUrl);
}
else
{
//根据code和微信参数得到openid
var openId = OAuth.GetOpenid(wxPayConfig.appid, wxPayConfig.appSecret, code);
//业务处理
}
return View();
}
通过使用OAuth类轻松的就能获取用户的Openid
标签：开发 grant class .text utf8 log div sns put
原文地址：https://www.cnblogs.com/jomzhang/p/9209241.html
