[英]C# HttpWebRequest Post Method many parameters in form
我正在编写一个简单的C#程序来做一些Web请求和发布数据。 我理解基础知识如何工作如何使用密码和html表单的东西登录。 但是我想知道是否有很多输入参数(例如这个问题页面),如复选框和文本字段,是否有任何有效的方法比硬编码字符串中的20个参数并传入它? 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,但我想知道是否有比这更有效的方法呢?
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;
}
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(基本上是post url字符串和发送的参数值),因此我可以将这些值硬编码到Postdatastring中(复选框,文本等)
我个人会做的是将参数构建为Dictionary<string,string>
这样你就可以这样做:
var parms = new Dictionary<string,string>();
parms.Add("username","fred");
然后你可以有一个方法,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获取最终参数字符
var parms_str = builder.ToString();
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