C# HttpWebRequest Post 方法表单中的很多参数
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C# HttpWebRequest Post Method many parameters in form
提问by noobiehacker
I am writing a simple C# program to do some web request and posting data. I understand how the basics work like how to login with password and stuff of a html form. However I am wondering if there is a lot of input parameters (such as this question page ) like check boxes and text fields, is there any efficient method than hard-coding 20 parameters in a string and passing it in? I can read the html file parse it and scan out the input and use String builder to make such a string but I am wondering is there a more efficient method than doing that?
我正在编写一个简单的 C# 程序来执行一些 Web 请求和发布数据。我了解基础知识是如何工作的，例如如何使用密码和 html 表单的内容登录。但是我想知道是否有很多输入参数（例如这个问题页面），例如复选框和文本字段，有没有比在字符串中硬编码20个参数并传入它的有效方法？我可以读取 html 文件解析它并扫描输入并使用 String builder 来制作这样的字符串，但我想知道有没有比这样做更有效的方法？
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;
}
Also is there a simple way to see what are the parameter values set to when I click a button on a html form within a browser (basically the post url string and parameter values that is sent) so I can hardcode those values into the Postdatastring (check boxs, texts etc)
还有一种简单的方法可以查看当我在浏览器中单击 html 表单上的按钮时设置的参数值是什么（基本上是发送的 url 字符串和参数值），以便我可以将这些值硬编码到 Postdatastring （复选框、文本等）
回答by Lloyd
Personally what I would do is build the parameters as a Dictionary<string,string>so that you can just do:
就我个人而言，我会做的是将参数构建为 aDictionary<string,string>以便您可以执行以下操作：
var parms = new Dictionary<string,string>();
parms.Add("username","fred");
You can then have a method such as:
然后你可以有一个方法，例如：
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();
}
You can then get the final parameter string with:
然后，您可以使用以下命令获取最终参数字符串：
var parms_str = builder.ToString();
