Question

好的，我需要查询实时网站以从表中获取数据，将此HTML表放入DataTable然后使用此数据。到目前为止，我已经设法使用Html Agility Pack和XPath来获取我需要的表中的每一行，但我知道必须有一种方法可以将其解析为DataTable。（C＃）我目前使用的代码是：

string htmlCode = "";
using (WebClient client = new WebClient())
{
htmlCode = client.DownloadString("http://www.website.com");
}
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();

doc.LoadHtml(htmlCode);

//My attempt at LINQ to solve the issue (not sure where to go from here)
var myTable = doc.DocumentNode
.Descendants("table")
.Where(t =>t.Attributes["summary"].Value == "Table One")
.FirstOrDefault();

//Finds all the odd rows (which are the ones I actually need but would prefer a
//DataTable containing all the rows!
foreach (HtmlNode cell in doc.DocumentNode.SelectNodes("//tr[@class='odd']/td"))
{
string test = cell.InnerText;
//Have not gone further than this yet!
}

我要查询的网站上的HTML表格如下：

<table summary="Table One">
<tbody>
<tr class="odd">
<td>Some Text</td>
<td>Some Value</td>
</tr>
<tr class="even">
<td>Some Text1</td>
<td>Some Value1</td>
</tr>
<tr class="odd">
<td>Some Text2</td>
<td>Some Value2</td>
</tr>
<tr class="even">
<td>Some Text3</td>
<td>Some Value3</td>
</tr>
<tr class="odd">
<td>Some Text4</td>
<td>Some Value4</td>
</tr>
</tbody>
</table>

我不确定是否更好/更容易使用LINQ + HAP或XPath + HAP来获得所需的结果，我尝试了两种方法，但您可能会看到它们。这是我第一次制作一个查询网站甚至以任何方式与网站互动的程序，所以我现在非常不确定！感谢您提前提供任何帮助：）

Answer 1

使用上面的一些Jack Eker代码和Mark Gravell（see post here）的一些代码，我设法找到了解决方案。此代码段用于在撰写本文时获取南非2012年的公众假期

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Web;
using System.Net;
using HtmlAgilityPack;



namespace WindowsFormsApplication
{
    public partial class Form1 : Form
    {
        private DataTable dt;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            string htmlCode = "";
            using (WebClient client = new WebClient())
            {
                client.Headers.Add(HttpRequestHeader.UserAgent, "AvoidError");
                htmlCode = client.DownloadString("http://www.info.gov.za/aboutsa/holidays.htm");
            }
            HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();

            doc.LoadHtml(htmlCode);

            dt = new DataTable();
            dt.Columns.Add("Name", typeof(string));
            dt.Columns.Add("Value", typeof(string));

            int count = 0;


            foreach (HtmlNode table in doc.DocumentNode.SelectNodes("//table"))
            {

                foreach (HtmlNode row in table.SelectNodes("tr"))
                {

                    if (table.Id == "table2")
                    {
                        DataRow dr = dt.NewRow();

                        foreach (var cell in row.SelectNodes("td"))
                        {
                            if ((count % 2 == 0))
                            {
                                dr["Name"] = cell.InnerText.Replace("&nbsp;", " ");
                            }
                            else
                            {

                                dr["Value"] = cell.InnerText.Replace("&nbsp;", " ");

                                dt.Rows.Add(dr);
                            }
                            count++;

                        }


                    }

                }


                dataGridView1.DataSource = dt;

            }
        }

    }
}

Answer 2

HTML Agility Pack没有开箱即用的方法，但创建一个方法应该不会太难。有samples out there从Linq-to XML到Datatable的XML。这些可以重新制作成你需要的东西。

如果需要，我可以帮助创建整个方法，但不是今天：）。

另见：

Answer 3

这是我的解决方案。可能有点乱，但目前工作正常：D

string htmlCode = "";
using (WebClient client = new WebClient())
{
client.Headers.Add(HttpRequestHeader.UserAgent, "AvoidError");
htmlCode = client.DownloadString("http://www.website.com");
}
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();

doc.LoadHtml(htmlCode);

DataTable dt = new DataTable();
dt.Columns.Add("Name", typeof(string));
dt.Columns.Add("Value", typeof(decimal));

int count = 0;
decimal rowValue = 0;
bool isDecimal = false;
foreach (var row in doc.DocumentNode.SelectNodes("//table[@summary='Table Name']/tbody/tr"))
{
DataRow dr = dt.NewRow();
foreach (var cell in row.SelectNodes("td"))
{
if ((count % 2 == 0))
{
dr["Name"] = cell.InnerText.Replace("&nbsp;", " ");
}
else
{
isDecimal = decimal.TryParse((cell.InnerText.Replace(".", "")).Replace(",", "."), out rowValue);
if (isDecimal)
{
dr["Value"] = rowValue;
}
dt.Rows.Add(dr);
}
count++;
}
}

Answer 4

将htmltable转换为datatable的简单逻辑：

//Define your webtable
public static HtmlTable table
            {
                get
                {
                    HtmlTable var = new HtmlTable(parent);
                    var.SearchProperties.Add("id", "searchId");
                    return var;
                }
            }

//Convert a webtable to datatable
public static DataTable getTable
            {
                get
                {
                    DataTable dtTable= new DataTable("TableName");
                    UITestControlCollection rows = table.Rows;
                    UITestControlCollection headers = rows[0].GetChildren();
                    foreach (HtmlHeaderCell header in headers)
                    {
                        if (header.InnerText != null)
                            dtTable.Columns.Add(header.InnerText);
                    }
                    for (int i = 1; i < rows.Count; i++)
                    {
                        UITestControlCollection cells = rows[i].GetChildren();
                        string[] data = new string[cells.Count];
                        int counter = 0;
                        foreach (HtmlCell cell in cells)
                        {
                            if (cell.InnerText != null)
                                data[counter] = cell.InnerText;
                            counter++;
                        }
                        dtTable.Rows.Add(data);
                    }
                    return dtTable;
                }
            }

Answer 5

你可以尝试

    DataTable.Rows[i].Cells[j].InnerText;

其中DataTable是表的id，i是行，j是单元格。

将数据从HTML表中获取到数据表中

5 个答案: