微信公共服务平台开发（.Net 的实现）1-------认证“成为开发者”

这些代码也就开始认证的时候用一次，以后就不用了：

const string Token = "XXXXX";//你的token
protected void Page_Load(object sender, EventArgs e)
{
    string postStr = "";
    if (Request.HttpMethod.ToLower() == "post")
    {
        System.IO.Stream s = System.Web.HttpContext.Current.Request.InputStream;
        byte[] b = new byte[s.Length];
        s.Read(b, 0, (int)s.Length);
        postStr = System.Text.Encoding.UTF8.GetString(b);
        if (!string.IsNullOrEmpty(postStr))
        {
            //ResponseMsg(postStr);
            Response.Write(ResponseMsg(postStr));
            Response.End();
        }
        //WriteLog("postStr:" + postStr);
    }
    else
    {
        Valid();
    }
}

/// <summary>
/// 验证微信签名
/// </summary>
/// * 将token、timestamp、nonce三个参数进行字典序排序
/// * 将三个参数字符串拼接成一个字符串进行sha1加密
/// * 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。
/// <returns></returns>
private bool CheckSignature()
{
    string signature = Request.QueryString["signature"].ToString();
    string timestamp = Request.QueryString["timestamp"].ToString();
    string nonce = Request.QueryString["nonce"].ToString();
    string[] ArrTmp = { Token, timestamp, nonce };
    Array.Sort(ArrTmp);     //字典排序
    string tmpStr = string.Join("", ArrTmp);
    tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
    tmpStr = tmpStr.ToLower();
    if (tmpStr == signature)
    {
        return true;
    }
    else
    {
        return false;
    }
}


private void Valid()
{
    string echoStr = Request.QueryString["echoStr"].ToString();
    if (CheckSignature())
    {
        if (!string.IsNullOrEmpty(echoStr))
        {
            Response.Write(echoStr);
            Response.End();
        }
    }
}


/// <summary>
/// 写日志(用于跟踪)
/// </summary>
private void WriteLog(string strMemo)
{
    string filename = Server.MapPath("/logs/log.txt");
    if (!Directory.Exists(Server.MapPath("//logs//")))
        Directory.CreateDirectory("//logs//");
    StreamWriter sr = null;
    try
    {
        if (!File.Exists(filename))
        {
            sr = File.CreateText(filename);
        }
        else
        {
            sr = File.AppendText(filename);
        }
        sr.WriteLine(strMemo);
    }
    catch
    {

    }
    finally
    {
        if (sr != null)
            sr.Close();
    }
}