阅读和使用C＃发布到网页 [英] Reading and posting to web pages using C#

问题描述

我在工作中需要我能够将信息输入到一个网页，阅读下一页我重定向到，然后采取进一步行动的项目。一个简化的真实世界的例子是像去google.com，进入编码技巧作为搜索条件，然后阅读结果的页面。

I have a project at work the requires me to be able to enter information into a web page, read the next page I get redirected to and then take further action. A simplified real-world example would be something like going to google.com, entering "Coding tricks" as search criteria, and reading the resulting page.

之类的小编码实例的那些挂在 http://www.csharp-station.com/HowTo/HttpWebFetch。 ASPX 告诉如何阅读网页，而不是如何通过提交信息到一个窗体，并继续到下一个页面进行操作。

Small coding examples like the ones linked to at http://www.csharp-station.com/HowTo/HttpWebFetch.aspx tell how to read a web page, but not how to interact with it by submitting information into a form and continuing on to the next page.

有关记录，我不是建立一个恶意的和/或垃圾邮件相关的产品。

For the record, I'm not building a malicious and/or spam related product.

那么，如何去阅读网页，需要正常浏览的几个步骤，以达到？第一个

So how do I go read web pages that require a few steps of normal browsing to reach first?

推荐答案

您可以通过编程方式创建一个HTTP请求和检索响应：

You can programmatically create an Http request and retrieve the response:

 string uri = "http://www.google.com/search";
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";

        // encode the data to POST:
        string postData = "q=searchterm&hl=en";
        byte[] encodedData = new ASCIIEncoding().GetBytes(postData);
        request.ContentLength = encodedData.Length;

        Stream requestStream = request.GetRequestStream();
        requestStream.Write(encodedData, 0, encodedData.Length);

        // send the request and get the response
        using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
        {

            // Do something with the response stream. As an example, we'll
            // stream the response to the console via a 256 character buffer
            using (StreamReader reader = new StreamReader(response.GetResponseStream()))
            {
                Char[] buffer = new Char[256];
                int count = reader.Read(buffer, 0, 256);
                while (count > 0)
                {
                    Console.WriteLine(new String(buffer, 0, count));
                    count = reader.Read(buffer, 0, 256);
                }
            } // reader is disposed here
        } // response is disposed here

当然，这段代码将因为谷歌使用GET，而不是帖子，搜索查询返回一个错误。

Of course, this code will return an error since Google uses GET, not POST, for search queries.

如果你正在处理此方法将工作与特定的网页，作为URL和POST数据基本上都是硬编码。如果你需要的东西，这是一个有点更有活力，你必须：

This method will work if you are dealing with specific web pages, as the URLs and POST data are all basically hard-coded. If you needed something that was a little more dynamic, you'd have to:

1. 抢页


2. 带出的形式


3. 创建基于表单字段POST字符串

。FWIW，我认为像Perl或Python的可能更适合于那种任务

FWIW, I think something like Perl or Python might be better suited to that sort of task.

编辑：X WWW的形式进行了urlencoded

edit: x-www-form-urlencoded

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