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1、生成微信小程序二维码，需要获取微信小程序Access_Token。代码如下，先获取Access_Token

/// <summary>

/// 获取微信小程序Access_Token

/// </summary>

/// <param name="appId">小程序唯一凭证</param>

/// <param name="appSecret">小程序唯一凭证密钥</param>

/// <returns></returns>

public static string GetAccessToken(string appId, string appSecret)

{

string access_token = string.Empty;

try

{

string token_url = $"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={appId}&secret={appSecret}";

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(token_url);

//请求方式

myRequest.Method = "GET";

HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();

Stream stream = myResponse.GetResponseStream();

XmlDictionaryReader xmlReader = JsonReaderWriterFactory.CreateJsonReader(stream, XmlDictionaryReaderQuotas.Max);

xmlReader.Read();

string xml = xmlReader.ReadOuterXml();

myResponse.Close();

stream.Close();

stream.Dispose();

XmlDocument doc = new XmlDocument();

doc.LoadXml(xml);

XmlElement rootElement = doc.DocumentElement;

access_token = rootElement.SelectSingleNode("access_token").InnerText.Trim();

return access_token;

}

catch (Exception ex)

{

throw ex;

}

2、生成微信小程序二维码，无限次数

/// <summary>

/// 生成微信小程序二维码

/// </summary>

/// <param name="picPath"></param>

/// <param name="access_token"></param>

/// <param name="paramData"></param>

/// <param name="page"></param>

/// <param name="width"></param>

public static void GetWeChatCodeLimit(string picPath, string access_token, string paramData = null, string page = null, int width = 430)

{

try

{

//这个路径生成的二维码是无限次数，scene参数最大32位

string url = $"https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token={access_token}";

Dictionary<string, object> dic = new Dictionary<string, object>();

if (string.IsNullOrWhiteSpace(paramData))

{

paramData = "id=123";

}

dic.Add("scene", paramData); //必填，有不能为空，随便填好了

if (!string.IsNullOrWhiteSpace(page))

{

dic.Add("path", page); //注意这里要用 path，而不是用page，官网有问题

}

dic.Add("width", width);

string json = JsonHelper.GetJSON<Dictionary<string, object>>(dic);

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);

myRequest.Method = "POST";

myRequest.ContentType = "application/json;charset=UTF-8";

byte[] payload = Encoding.UTF8.GetBytes(json);

myRequest.ContentLength = payload.Length;

Stream writer = myRequest.GetRequestStream();

writer.Write(payload, 0, payload.Length);

writer.Close();

HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();

Stream stream = myResponse.GetResponseStream();//返回图片数据流

byte[] byteArray = StreamToBytes(stream);//将数据流转为byte[]

if (byteArray.Length > 1000)

{

File.WriteAllBytes(picPath, byteArray);

}

else

{

//转字符串--报错

string str = Encoding.Default.GetString(byteArray);

throw new Exception(str);

}

myResponse.Close();

stream.Close();

stream.Dispose();

}

catch (Exception ex)

{

throw ex;

}

3、生成微信小程序二维码，有限次数

/// <summary>

/// 生成微信小程序二维码

/// </summary>

/// <param name="picPath"></param>

/// <param name="access_token"></param>

/// <param name="paramData"></param>

/// <param name="page"></param>

/// <param name="width"></param>

public static void CreateWeChatQrCode(string picPath, string access_token, string paramData = null, string page = null, int width = 430)

{

try

{

//这个路径有限次数，1000，000个，要注意使用

//string url = $"https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token={access_token}";

//这个生成是小程序码，上面是二维码

string url = $"https://api.weixin.qq.com/wxa/getwxacode?access_token={access_token}";

if (!string.IsNullOrWhiteSpace(paramData))

{

page += "?" + paramData;

}

Dictionary<string, object> dic = new Dictionary<string, object>();

dic.Add("path", page); //必填

dic.Add("width", width);

string json = JsonHelper.GetJSON<Dictionary<string, object>>(dic);

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);

myRequest.Method = "POST";

myRequest.ContentType = "application/json;charset=UTF-8";

byte[] payload = Encoding.UTF8.GetBytes(json);

myRequest.ContentLength = payload.Length;

Stream writer = myRequest.GetRequestStream();

writer.Write(payload, 0, payload.Length);

writer.Close();

HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();

Stream stream = myResponse.GetResponseStream();//返回图片数据流

byte[] byteArray = StreamToBytes(stream);//将数据流转为byte[]

if (byteArray.Length > 1000)

{

File.WriteAllBytes(picPath, byteArray);

}

else

{

//转字符串

string str = Encoding.Default.GetString(byteArray);

throw new Exception(str);

}

myResponse.Close();

stream.Close();

stream.Dispose();

}

catch (Exception ex)

{

throw ex;

}

/// <summary>

/// 将数据流转为byte[]

/// </summary>

/// <param name="stream"></param>

/// <returns></returns>

public static byte[] StreamToBytes(Stream stream)

{

List<byte> bytes = new List<byte>();

int temp = stream.ReadByte();

while (temp != -1)

{

bytes.Add((byte)temp);

temp = stream.ReadByte();

}

return bytes.ToArray();

}

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