微信公众号开发笔记(C#)

这篇文章还不错，使用 .net , 对微信用户的想公众号发送的文字进行回复。比较简单，自己可以修改更复杂的回复。

微信公众号开发笔记(C#)

原文地址

需求分析

根据用户在微信上发送至价值中国公众号的消息，查询与该消息相关的内容返回给用户。

例如，用户发送【美国经济】后收到包含【美国经济】的内容，点击可查看全文。若没有查询到相关内容，则返回默认消息。

运行环境

.NET

准备工作

1.在微信公众平台申请开发者。

2.功能页面完成后上传至自己的网站并能正常访问该URL（以下统称：目标接口）

3.在微信公众平台开启开发模式。

开发流程

1.验证签名，微信服务器会发一个GET请求到目标接口，接收参数后开始验证。

2.首先接收微信服务器发送的请求，然后进行处理，请求为xml格式，携带公众号、发送方微信号、消息类型，消息内容等结点。

3.根据消息类型，从数据库读取相关预设内容返回，要求响应时间在5秒内，返回格式同样是xml格式。

备注

输出内容一定要使用UTF-8的编码方式，否则中文会产生乱码。

如果消息中需要换行，使用\r\n来换行。

支持html的a标签，但是如果是换行是紧邻关系的话可能无法识别换行。

完整代码

using System;

using System.IO;

using System.Text;

using System.Web;

using System.Web.Security;

using System.Xml;

public class WeChat : IHttpHandler

{

public void ProcessRequest(HttpContext context)

{

weixin wx = new weixin();

String postStr = String.Empty;

if (HttpContext.Current.Request.HttpMethod.ToUpper() == "POST")

{

Stream s = HttpContext.Current.Request.InputStream;

Byte[] b = new Byte[s.Length];

s.Read(b, 0, (Int32)s.Length);

postStr = Encoding.UTF8.GetString(b);

if (!String.IsNullOrEmpty(postStr))

{

wx.Handle(postStr);

}

else

{

wx.Auth();

}

public bool IsReusable

{

get

{

return false;

}

public class weixin

{

private String Token = "改写为自己的Token";

private String DefaultResponseContent = "欢迎关注价值中国\r\n价值中国是中国领先的财经商业领域社会化媒体";

public void Auth()

{

String echoStr = HttpContext.Current.Request.QueryString["echoStr"];

if (CheckSignature())

{

if (!String.IsNullOrEmpty(echoStr))

{

HttpContext.Current.Response.Write(echoStr);

HttpContext.Current.Response.End();

}

public void Handle(String postStr)

{

XmlDocument doc = new XmlDocument();

doc.LoadXml(postStr);

XmlElement rootElement = doc.DocumentElement;

XmlNode MsgType = rootElement.SelectSingleNode("MsgType");

RequestXML requestXML = new RequestXML();

requestXML.ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText;

requestXML.FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText;

requestXML.CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText;

requestXML.MsgType = MsgType.InnerText;

if (requestXML.MsgType == "text")

{

requestXML.Content = rootElement.SelectSingleNode("Content").InnerText;

}

else if (requestXML.MsgType == "location")

{

requestXML.Location_X = rootElement.SelectSingleNode("Location_X").InnerText;

requestXML.Location_Y = rootElement.SelectSingleNode("Location_Y").InnerText;

requestXML.Scale = rootElement.SelectSingleNode("Scale").InnerText;

requestXML.MapInfo = rootElement.SelectSingleNode("Label").InnerText;

}

else if (requestXML.MsgType == "image")

{

requestXML.PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText;

}

ResponseMsg(requestXML);

}

/// 验证微信签名

private bool CheckSignature()

{

String signature = HttpContext.Current.Request.QueryString["signature"];

String timestamp = HttpContext.Current.Request.QueryString["timestamp"];

String nonce = HttpContext.Current.Request.QueryString["nonce"];

String[] ArrTmp = { Token, timestamp, nonce };

Array.Sort(ArrTmp);

String tmpStr = String.Join("", ArrTmp);

tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");

tmpStr = tmpStr.ToLower();

if (tmpStr == signature)

{

return true;

}

else

{

return false;

}

/// <summary>

/// 回复消息

/// </summary>

/// <param name="weixinXML"></param>

private void ResponseMsg(RequestXML requestXML)

{

String responseContent = String.Empty;

if (requestXML.MsgType == "text")

{

responseContent = FormatTextXML(requestXML.FromUserName, requestXML.ToUserName, "从数据库读取的内容");

}

HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;

HttpContext.Current.Response.Write(responseContent);

}

/// 返回格式化文本XML内容

private String FormatTextXML(String fromUserName, String toUserName, String content)

{

return "<xml><ToUserName><![CDATA[" + fromUserName + "]]></ToUserName><FromUserName><![CDATA[" + toUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[" + content + "]]></Content><FuncFlag>1</FuncFlag></xml>";

}

private int ConvertDateTimeInt(System.DateTime time)

{

System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));

return (int)(time - startTime).TotalSeconds;

}

//微信请求类

public class RequestXML

{

private String toUserName = String.Empty;

/// <summary>

/// 公众号

/// </summary>

public String ToUserName

{

get { return toUserName; }

set { toUserName = value; }

}

private String fromUserName = "";

/// <summary>

/// 发送方微信号

/// </summary>

public String FromUserName

{

get { return fromUserName; }

set { fromUserName = value; }

}

private String createTime = String.Empty;

/// <summary>

/// 创建时间

/// </summary>

public String CreateTime

{

get { return createTime; }

set { createTime = value; }

}

private String msgType = String.Empty;

/// <summary>

/// 信息类型地理位置:location,文本消息:text,消息类型:image

/// </summary>

public String MsgType

{

get { return msgType; }

set { msgType = value; }

}

private String content = String.Empty;

/// <summary>

/// 信息内容

/// </summary>

public String Content

{

get { return content; }

set { content = value; }

}

private String location_X = String.Empty;

/// <summary>

/// 地理位置纬度

/// </summary>

public String Location_X

{

get { return location_X; }

set { location_X = value; }

}

private String location_Y = String.Empty;

/// <summary>

/// 地理位置经度

/// </summary>

public String Location_Y

{

get { return location_Y; }

set { location_Y = value; }

}

private String scale = String.Empty;

/// <summary>

/// 地图缩放大小

/// </summary>

public String Scale

{

get { return scale; }

set { scale = value; }

}

private String mapInfo = String.Empty;

/// <summary>

/// 地理位置信息

/// </summary>

public String MapInfo

{

get { return mapInfo; }

set { mapInfo = value; }

}

private String picUrl = String.Empty;

/// <summary>

/// 图片链接

/// </summary>

public String PicUrl

{

get { return picUrl; }

set { picUrl = value; }

}


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