如何阅读HTML出一个网页，并用它作为HTML自动应答电子邮件的身体

Question

我的工作在一个HTML自动回复电子邮件。如果有一个更简单的方法比我在做什么，请让我知道。

到目前为止，我已经建立了“pagename.aspx”我阅读此页为一个字符串变量，然后使用这个变量作为邮件的正文。其工作原理。

在页面可选地接受一个名为“leadID”查询字符串。这是用来从数据库中提取数据和填充字段此页面上。这也能正常工作时，我手动浏览页面 - ？pagename.aspx leadid = XYZ

我的问题/问题是的，我怎么这个查询字符串传递给页面和页面生成的HTML输出返回到一个字符串，然后它可以作为我的电子邮件的正文。

此外，如果有更好的方法，请让我知道。我使用LINQ到SQL，VB.NET和ASP.NET 3.5。

由于一百万。

Answer 1

在最简单的方法是只是做一个WebRequest它：

string url = "...";
string result;

HttpWebRequest webrequest = (HttpWebRequest) HttpWebRequest.Create(url);
webrequest.Method        = "GET";
webrequest.ContentLength = 0;

WebResponse response = webrequest.GetResponse();

using(StreamReader stream = new StreamReader(response.GetResponseStream())){
    result = stream.ReadToEnd();
}

Answer 2

如在这篇文章描述，可以使用HttpWebRequest类从您的网页“pagename.aspx？leadID = 1”检索数据流。但是，这可能导致比特开销到应用程序的由于额外的HTTP请求。

那岂不是有可能/最好生成一个简单的类你的HTML内容？哪些内容产生的页面？

编辑： 至于问哈立德这里是一个简单的类使用leadID参数和GridView控件生成一个动态HTML文件。这只是一个例子，你将需要自定义它，让更多的可重复使用的：

using System;
using System.Text;
using System.IO;
using System.Web.UI.WebControls;
using System.Web.UI;

public class PageBroker
{

    /*
     * How to use PageBroker:
     * 
     *  string leadID = "xyz"; // dynamic querystring parameter
     *  string pathToHTML = Server.MapPath(".") + "\\HTML\\leadForm.html"; //more detail about this file below
     *  PageBroker pLeadBroker = new PageBroker(pathToHTML, leadID);  
     *  Response.Write(pLeadBroker.GenerateFromFile()); // will show content of generated page
     */

    private string _pathToFile;
    private StringBuilder _fileContent;
    private string _leadID;

    public PageBroker(string pathToFile, string leadID)
    {
        _fileContent = new StringBuilder();
        _pathToFile = pathToFile;
        _leadID = leadID;
    }

    public string GenerateFromFile() {
        return LoadFile();
    }
    private string LoadFile()
    {
        // Grab file and load content inside '_fileContent'
        // I used an html file to create the basic structure of your page
        // but you can also create
        // a page from scratch.
        if (File.Exists(_pathToFile))
        {
            FileStream stream = new FileStream(_pathToFile, FileMode.Open, FileAccess.Read);
            StreamReader reader = new StreamReader(stream);
            while (reader.Peek() > -1)
                _fileContent.Append(reader.ReadLine() + "\n");
            stream.Close();
            reader.Close();

            InjectTextContent();
            InjectControlsContent();
        }        
        return _fileContent.ToString();
    }

    // (Ugly) method to inject dynamic values inside the generated html
    // You html files need to contain all the necesary tags to place your
    // content (for example: '__USER_NAME__')
    // It would be more OO if a dictionnary object was passed to the 
    // constructor of this class and then used inside this method 
    // (I leave it hard-coded for the sake of understanding but 
    // I can give you a more detailled code if you need it).
    private void InjectTextContent() {
        _fileContent.Replace("__USER_NAME__", "Khalid Rahaman");
    }

    // This method add the render output of the controls you need to place
    // on the page. At this point you will make use of your leadID parameter,
    // I used a simple array with fake data to fill the gridview.
    // You can add whatever control you need.
    private void InjectControlsContent() {
        string[] products = { "A", "B", "C", "D" };
        GridView gvProducts = new GridView();
        gvProducts.DataSource = products;
        gvProducts.DataBind();

        // HtmlTextWriter is used to write HTML programmatically. 
        // It provides formatting capabilities that ASP.NET server 
        // controls use when rendering markup to clients 
        // (http://msdn.microsoft.com/en- us/library/system.web.ui.htmltextwriter.aspx)
        // This way you will be able to inject the griview's 
        // render output inside your file.
        StringWriter gvProductsWriter = new StringWriter();
        HtmlTextWriter htmlWrit = new HtmlTextWriter(gvProductsWriter);
        gvProducts.RenderControl(htmlWrit);
        _fileContent.Replace("__GRIDVIEW_PRODUCTS__", gvProductsWriter.ToString());
    }
}