C＃HttpWebRequest Post Method表格中有很多參數

Question

我正在編寫一個簡單的C＃程序來做一些Web請求和發布數據。 我理解基礎知識如何工作如何使用密碼和html表單的東西登錄。 但是我想知道是否有很多輸入參數（例如這個問題頁面），如復選框和文本字段，是否有任何有效的方法比硬編碼字符串中的20個參數並傳入它？ 我可以讀取html文件解析它並掃描輸入並使用String builder來制作這樣的字符串，但我想知道是否有比這更有效的方法呢？

    private HtmlAgilityPack.HtmlDocument getpage(string url ,String input)
    {
        try
        {
            Stream datastream;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.CookieContainer = new CookieContainer();
            request.CookieContainer.Add(cookies);
            request.AllowAutoRedirect = true;
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";
            request.ContentType = "application/x-www-form-urlencoded";

            if (input!=null)
            {
                String postData = "";
                request.Method = "POST";
                if (input == "login")
                {
                    postData = String.Format("username={0}&password={1}", "myusername", "mypassword");
                }
                else if (input == "sendMessage")
                {
                //THIS IS THE LONG STRING THAT I DON'T WANT TO HARD CODE
                    postData = String.Format("reciever={0}&sendmessage={1}", "thepersontomessage" ,this.DefaultMessage);
                //I am just puting two parameters for now, there should be alot
                }
                byte[] byteArray = Encoding.UTF8.GetBytes(postData);
                request.ContentLength = byteArray.Length;
                datastream = request.GetRequestStream();
                datastream.Write(byteArray, 0, byteArray.Length);
                datastream.Close();
            }

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            datastream = response.GetResponseStream();
            String sourceCode = "";
            using (StreamReader reader = new StreamReader(datastream))
            {
                sourceCode = reader.ReadToEnd();
            }

            HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
            htmlDoc.LoadHtml(sourceCode);
            this.cookies.Add(response.Cookies);
            return htmlDoc;
        }
        catch (Exception)
        {
            return null;
        }

還有一種簡單的方法可以查看當我在瀏覽器中單擊html表單上的按鈕時設置的參數值（基本上是post url字符串和發送的參數值），因此我可以將這些值硬編碼到Postdatastring中（復選框，文本等）

Answer 1

我個人會做的是將參數構建為Dictionary<string,string>這樣你就可以這樣做：

var parms = new Dictionary<string,string>();

parms.Add("username","fred");

然后你可以有一個方法，如：

string DictToString(Dictionary<string,string> dict)
{
   StringBuilder builder = new StringBuilder();

   foreach(KeyValuePair<string,string> kvp in dict) {
      builder.Append(kvp.Key + "=" + kvp.Value + "&");
   }

   return builder.ToString();
}

然后，您可以使用以下命令獲取最終參數字符

var parms_str = builder.ToString();