如何在C＃的html文件中指定第二个表

Question

I need to get the sum of the 4th row of the second table. 我需要获取第二张表的第四行的总和。 I want to sum beginning with the second column. 我想从第二列开始进行总结。 How do I do this? 我该怎么做呢？

    static void Main()
    {
        String htmlFile = "C:/Temp/Test_11.html";

        HtmlDocument doc = new HtmlDocument();
        doc.Load(htmlFile);

        //var sum = doc.DocumentNode.SelectSingleNode("//table")  // <<<< No error when I access the first table 
        var sum = doc.DocumentNode.SelectSingleNode("//table[2]")  // <<<< Error when I try to access the 2nd table
            .Elements("tr")
            // Skip this many rows from the top
            .Skip(1)
            // .ElementAt(2) = third column
            .Sum(tr => int.Parse(tr.Elements("td").ElementAt(2).InnerText));
        Console.WriteLine(sum);

        Console.ReadLine();
    }

Below is the html file consisting of two tables. 以下是由两个表组成的html文件。 The result of the sum should be 26. 总和的结果应为26。

<html>
<head>
<title>Tables</title>
</head>
<body>
<table border="1">
  <tr>
    <th>Environment1</th>
    <th>Databases</th>
    <th>Sites</th>
    <th>Site Collection Storage Used (GB)</th>
    <th>Ref</th>
</th>
  </tr>
  <tr>
    <td>Public1</td>
    <td>14</td>
    <td>28</td>
    <td>32.6602</td>
    <td>2</td>
  </tr>
  <tr>
    <td>Local1</td>
    <td>4</td>
    <td>9</td>
    <td>21.0506</td>
    <td>1</td>
  </tr>
  <tr>
    <td>Shared1</td>
    <td>6</td>
    <td>9</td>
    <td>17.092</td>
    <td>9</td>
  </tr>
</table>
<p></p>
<table border="1">
  <tr>
    <th>Environment2</th>
    <th>Databases</th>
    <th>Sites</th>
    <th>Site Collection Storage Used (GB)</th>
    <th>Ref</th>
 </th>
  </tr>
  <tr>
    <td>Public2</td>
    <td>15</td>
    <td>13</td>
    <td>31.5602</td>
    <td>1</td>
  </tr>
  <tr>
    <td>Local2</td>
    <td>5</td>
    <td>8</td>
    <td>7.0302</td>
    <td>3</td>
  </tr>
  <tr>
    <td>Shared2</td>
    <td>4</td>
    <td>5</td>
    <td>13.109</td>
    <td>4</td>
  </tr>
</table>

</body>
</html>

Please help me with this 请在这件事上给予我帮助

Answer 1

The following sample does the same, the only concern is that I have hardcoded the positions and the elements in the xPath, which you can freely change to accommodate you requirement. 以下示例执行相同的操作，唯一的问题是我已经对xPath中的位置和元素进行了硬编码，您可以自由更改它们以适应您的需求。

var tbl = xdoc.SelectNodes("//table[2]//tr[4]//td[position()>1]");

// In order to select the 1st table, the following statement can be used.
//var tbl = xdoc.SelectNodes("//table[2]//tr[4]//td[position()>1]");

int sum = 0;

foreach (XmlNode item in tbl) 
{
     decimal value = 0;
     if (decimal.TryParse(item.InnerText, out value))
     {
         sum += (int)value;
     }
 }

 Console.WriteLine("Number of (Web Application) sites: " + sum);

There are couple of points to note. 有几点要注意。 You have values in decimal and have treated them like an integer. 您的值以十进制表示，并且已将它们视为整数。 Hence I have used the decimal temporary variable to get all values and then done integer casting. 因此，我使用了十进制临时变量来获取所有值，然后进行整数转换。 This is however not the best practice. 但是，这不是最佳实践。 You have to look into that based on your exact requirement. 您必须根据您的确切要求进行调查。

Additionally, i have used the TryParse so that only the items that can be parsed can be used for the calculation. 此外，我使用了TryParse以便仅可以解析的项目可以用于计算。

Please share your understanding here. 请在这里分享您的理解。

如何在C＃的html文件中指定第二个表

问题描述

1 个解决方案

解决方案1
0 已采纳 2013-05-26 06:03:25

如何在C＃的html文件中指定第二个表

问题描述

1 个解决方案

解决方案1 0 已采纳 2013-05-26 06:03:25

解决方案1
0 已采纳 2013-05-26 06:03:25