C# 使用 htmlagilitypack 解析表中的特定行

Question

我正在开发一个 C# 应用程序，我需要在其中解析表中的特定行并将其不同值与给定字符串进行比较。

我要解析的网址是 http://wsrpg.com/clans/57

<table cellspacing="0" cellpadding="0" border="0" class="table">
<thead>
<tr>
<th width="100">Rank</th>
<th width="150">Nick</th>
<th width="100">RCASH</th>
<th width="150">Activity in December</th>
<th width="100">Comportment</th>
<th width="100">Online</th>
<th width="150">Last Login</th> 
</tr>
</thead>

<tr><td>Leader</td><td>robbie_william</td><td>351</td><td>1024</td><td>1195</td><td class='offline'><span class="label label-danger">Offline</span></td><td>03/01/2016</td></tr><tr><td>Boss</td><td>Alloy_</td><td>1418</td><td>1043</td><td>354</td><td class='offline'><span class="label label-danger">Offline</span></td><td>26/12/2015</td></tr><tr><td>Boss</td><td>AnonYmous_</td><td>32976</td><td>5142</td><td>937</td><td class='offline'><span class="label label-danger">Offline</span></td><td>04/01/2016</td></tr><tr><td>Boss</td><td>dJones</td><td>2739</td><td>6152</td><td>1044</td><td class='online'><span class="label label-success">Online</span></td><td>04/01/2016</td></tr><tr><td>Boss</td><td>SHARP</td><td>9015</td><td>1216</td><td>32</td><td class='offline'><span class="label label-danger">Offline</span></td><td>04/01/2016</td></tr><tr><td>Boss</td><td>Steffie</td><td>7888</td><td>6043</td><td>887</td><td class='online'><span class="label label-success">Online</span></td><td>04/01/2016</td></tr><tr><td>Boss</td><td>YOLOvsYODO</td><td>10950</td><td>2703</td><td>385</td><td class='offline'><span class="label label-danger">Offline</span></td><td>04/01/2016</td></tr><tr><td>Member</td><td>Angel_</td><td>8629</td><td>3256</td><td>167</td><td class='offline'><span class="label label-danger">Offline</span></td><td>04/01/2016</td></tr><tr><td>Member</td><td>asad</td><td>2452</td><td>3938</td><td>183</td><td class='offline'><span class="label label-danger">Offline</span></td><td>03/01/2016</td></tr><tr><td>Member</td><td>D3nim</td><td>1285</td><td>3217</td><td>31</td><td class='offline'><span class="label label-danger">Offline</span></td><td>03/01/2016</td></tr><tr><td>Member</td><td>Dell</td><td>5025</td><td>3305</td><td>182</td><td class='offline'><span class="label label-danger">Offline</span></td><td>01/01/2016</td></tr><tr><td>Member</td><td>Habib</td><td>1650</td><td>3860</td><td>36</td><td class='offline'><span class="label label-danger">Offline</span></td><td>04/01/2016</td></tr><tr><td>Member</td><td>Iron_MiXx</td><td>2569</td><td>485</td><td>525</td><td class='offline'><span class="label label-danger">Offline</span></td><td>03/01/2016</td></tr><tr><td>Member</td><td>MCool</td><td>4960</td><td>12739</td><td>290</td><td class='online'><span class="label label-success">Online</span></td><td>04/01/2016</td></tr><tr><td>Member</td><td>PREXEN</td><td>127</td><td>3873</td><td>1547</td><td class='offline'><span class="label label-danger">Offline</span></td><td>04/01/2016</td></tr><tr><td>Member</td><td>Sensation_</td><td>2733</td><td>1944</td><td>338</td><td class='offline'><span class="label label-danger">Offline</span></td><td>03/01/2016</td></tr><tr><td>Member</td><td>Wizard_</td><td>2081</td><td>2578</td><td>46</td><td class='offline'><span class="label label-danger">Offline</span></td><td>03/01/2016</td></tr>
</table>

我只希望将昵称存储在字符串或字符串数​​组中，以便我可以使用它与已经给定的字符串进行比较。

我要实现的是检查用户输入的昵称是否存在于这个表中。

我将使用 bool 方法来实现。

解决方案： 我使用了 Tim Schmelter 的代码，下面是我的使用方法：

private bool Authenticate(string nick)
        {
            using (WebClient client = new WebClient())
            {
                string html = client.DownloadString("http://wsrpg.com/clans/57");
                DataTable table = GetTable(html, "table", true);
                string[] nicks = table.AsEnumerable().Select(r => r.Field<string>("nick")).ToArray();
               if(nicks.Contains(nick))
                {
                    return true;
                }
               else
                {
                    return false;
                }
            }
        }

然后调用它

bool Authenticated = Authenticate(Player.GetName());

Answer 1

您可以使用此方法解析 HTML 并使用包含给定类名的第一个表填充 DataTable：

public static DataTable GetTable(string html, string tableClass, bool firstRowContainsHeader = false)
{
    var doc = new HtmlAgilityPack.HtmlDocument();
    doc.LoadHtml(html);

    string xpath = string.Format("//table[contains(@class,'{0}')]", tableClass);
    var firstTable = doc.DocumentNode.SelectSingleNode(xpath);
    if (firstTable == null) return null;

    DataTable table = new DataTable();
    var tableRows = firstTable.Descendants("tr");
    var tableData = tableRows.Skip(firstRowContainsHeader ? 1 : 0)
        .Select(row => row.Descendants("td")
            .Select((cell, index) => new { row, cell, index, cell.InnerText })
            .ToList());

    var headerCells = tableRows.First().Descendants()
        .Where(n => n.Name == "td" || n.Name == "th");
    int columnIndex = 0;
    foreach (HtmlNode cell in headerCells)
    {
        string colName = firstRowContainsHeader
            ? cell.InnerText
            : String.Format("Column {0}", (++columnIndex).ToString());
        table.Columns.Add(colName, typeof(string));
    }
    foreach (var rowCells in tableData)
    {
        DataRow row = table.Rows.Add();
        for (int i = 0; i < Math.Min(rowCells.Count, table.Columns.Count); i++)
        {
            row.SetField(i, rowCells[i].InnerText);
        }
    }

    return table;
}

然后你可以使用 LINQ-To-DataTable 来检查它是否包含给定的 nick：

string html = File.ReadAllText("C:\\Temp\\html.txt");  // loading your sample from file
DataTable table = GetTable(html, "table", true);
string nick = "robbie_william";  // input example
bool isContained = table.AsEnumerable()
    .Any(r => nick.Equals(r.Field<string>("nick"), StringComparison.InvariantCultureIgnoreCase));

如果您只想填写string[] 或List<string>：

string[] nicks = table.AsEnumerable().Select(r => r.Field<string>("nick")).ToArray(); // or ToList()

Answer 2

执行此操作的最简单方法是使用元素的 XPath，因此我拥有的应用程序可以解析我拥有的不同表：

string tableResult = htmlDocument.DocumentNode.SelectSingleNode("//table[@class='output']/tr[3]/td[3]").InnerText;