我希望有人可以帮我解决一直困扰我多年的问题。
是否可以在打开浏览器时将数据从C＃应用程序发送到网页，例如如果你有一个在线登录表，并希望从你的C＃应用程序发布该表单的用户名和密码。
我看到类似于打开浏览器到表单页面的内容，并将登录详细信息从程序发布到该页面，然后页面可以立即处理表单，从而登录并将它们发送到主页。这可能吗？
提前致谢
保
答案 0 :(得分：9)
是肯定的。
您可以使用HttpWebRequest与网页或Web服务器（或Web服务）进行通信。这是我用来从facebook url获取数据的实际代码：
internal static string FbFetch(string url)
{
var request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "GET";
using (var response = (HttpWebResponse)request.GetResponse())
{
using (var reader = new StreamReader(response.GetResponseStream()))
{
var responseText = reader.ReadToEnd();
return responseText;
}
}
}
但是，您所描述的内容称为“HTML屏幕抓取”，它可能是构建应用程序的繁琐而脆弱的方法。单调乏味，因为很难在所有UI糖果中徘徊，而且很脆弱，因为如果页面设计师改变了他的页面，你的屏幕抓取将不再有效。
祝你好运。答案 1 :(得分：1)
要回答关于HTTP帖子（带附件）的问题，由于附件，它更加难以理解。这是我用来将图像发布到FaceBook的实际代码。
/// <summary>
/// Create a new HttpWebRequest with the default properties for HTTP POSTS
/// </summary>
/// <param name="url">The URL to be posted to</param>
/// <param name="referer">The refer</param>
/// <param name="cookies">CookieContainer that should be used in this request</param>
/// <param name="postData">The post data</param>
private string CreateHttpWebUploadRequest(string url, string referer, CookieContainer cookies, NameValueCollection postData, FileInfo fileData, string fileContentType)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
string boundary = "----------" + DateTime.UtcNow.Ticks.ToString("x", CultureInfo.InvariantCulture);
// set the request variables
request.Method = WebRequestMethods.Http.Post;
request.ContentType = "multipart/form-data; boundary=" + boundary;
request.CookieContainer = cookies;
request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4";
request.Accept = "image/gif, image/jpeg, image/pjpeg, image/pjpeg, */*";
request.Headers.Add("Accept-Encoding: gzip,deflate");
request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
request.Headers.Add("Accept-Language: en-us");
request.Referer = referer;
request.KeepAlive = true;
request.AllowAutoRedirect = false;
// process through the fields
StringBuilder sbHeader = new StringBuilder();
// add form fields, if any
if (postData != null)
{
foreach (string key in postData.AllKeys)
{
string[] values = postData.GetValues(key);
if (values != null)
{
foreach (string value in values)
{
if (!string.IsNullOrEmpty(value))
sbHeader.AppendFormat("--{0}\r\n", boundary);
sbHeader.AppendFormat("Content-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}\r\n", key, value);
}
}
}
}
if (fileData != null)
{
sbHeader.AppendFormat("--{0}\r\n", boundary);
sbHeader.AppendFormat("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n", "media", fileData.Name);
sbHeader.AppendFormat("Content-Type: {0}\r\n\r\n", fileContentType);
}
byte[] header = Encoding.UTF8.GetBytes(sbHeader.ToString());
byte[] footer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
long contentLength = header.Length + (fileData != null ? fileData.Length : 0) + footer.Length;
// set content length
request.ContentLength = contentLength;
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(header, 0, header.Length);
// write the uploaded file
if (fileData != null)
{
// write the file data, if any
byte[] buffer = new Byte[fileData.Length];
var bytesRead = fileData.OpenRead().Read(buffer, 0, (int)(fileData.Length));
requestStream.Write(buffer, 0, bytesRead);
}
// write footer
requestStream.Write(footer, 0, footer.Length);
requestStream.Flush();
requestStream.Close();
using (var response = request.GetResponse() as HttpWebResponse)
{
using (var stIn = new System.IO.StreamReader(response.GetResponseStream()))
{
return stIn.ReadToEnd();
}
}
}
}
<强>更新 为了使其完整，这里是帖子的代码，而不需要文件附件。我再次使用此代码发布到FaceBook。
/// <summary>
/// Create a new HttpWebRequest with the default properties for HTTP POSTS
/// </summary>
/// <param name="url">The URL to be posted to</param>
/// <param name="referer">The refer</param>
/// <param name="cookies">CookieContainer that should be used in this request</param>
/// <param name="postData">The post data (needs to be formatted in name=value& format</param>
private string CreateHttpWebPostRequest(string url, string referer, CookieContainer cookies, NameValueCollection postData)
{
var sbPostData = new StringBuilder();
if (postData != null)
{
foreach (string key in postData.AllKeys)
{
string[] values = postData.GetValues(key);
if (values != null)
{
foreach (string value in values)
{
if (!string.IsNullOrEmpty(value))
sbPostData.Append(string.Format("{0}={1}&", HttpUtility.UrlEncode(key), HttpUtility.UrlEncode(value)));
}
}
}
}
var parameterString = Encoding.UTF8.GetBytes(sbPostData.ToString());
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Method = WebRequestMethods.Http.Post;
request.CookieContainer = cookies;
request.ContentLength = parameterString.Length;
request.ContentType = "application/x-www-form-urlencoded";
request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4";
request.Accept = "image/gif, image/jpeg, image/pjpeg, image/pjpeg, */*";
request.Headers.Add("Accept-Encoding: gzip,deflate");
request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
request.Headers.Add("Accept-Language: en-us");
request.Referer = referer;
request.KeepAlive = true;
request.AllowAutoRedirect = false;
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(parameterString, 0, parameterString.Length);
requestStream.Close();
using (var response = request.GetResponse() as HttpWebResponse)
{
using (var stIn = new System.IO.StreamReader(response.GetResponseStream()))
{
return stIn.ReadToEnd();
}
}
}
}
答案 2 :(得分：0)
您可以直接在C＃中自动执行webbrowser control。与HttpWebRequest不同，这适用于任何网站。
但如果您有更多的钱而不是时间，请考虑使用商业广告component。