如何在 c# 中选择包含所有子项的 dl 标记

Question

>我从打击HTML表中选择所有dt和dd时遇到问题

<dl class="Grid Grid--multicol Grid--2col:40em Grid--4col:60em">
    <div class="Grid-cell u-flex u-flexOne u-flexRow">
        <dt> Item ID:</dt>
        <dd class="u-weightSemibold u-paddingL5px">72547664</dd>
    </div>
    <div class="Grid-cell u-flex u-flexOne u-flexRow">
            <dt> License:</dt>
            <dd class="u-weightSemibold u-paddingL5px">
                <a class="u-linkDodgerBlue js-infoLicenseString" href="" target="_blank">Standard</a>
            </dd>
    </div>
    <div class="Grid-cell u-flex u-flexOne u-flexRow">
            <dt> Usage:</dt>
            <dd class="u-weightSemibold">Commercial<span class="TooltipQuestionMark"></span></dd>
    </div>
    <div class="Grid-cell u-flex u-flexOne u-flexRow">
            <dt> Required Plugins:</dt>
            <dd class="u-weightSemibold u-paddingL5px">None</dd>
    </div>
    <div class="Grid-cell u-flex u-flexOne u-flexRow">
            <dt> Creation Tool:</dt>
            <dd class="u-weightSemibold u-paddingL5px">Autodesk</dd>
    </div>
    <div class="Grid-cell u-flex u-flexOne u-isHidden:0-60em"></div>
</dl>

我写这个

            i = 0; doc.DocumentNode.SelectNodes("//dl").Where(x => x.HasClass("Grid")).FirstOrDefault().SelectNodes(".//div").ToList().ForEach(x =>
            {
                result.Items.Add(new DownloadItem { Name = "specs-title", Index = i,    Type = DownloadItemType.Text, Value = x.SelectNodes(".//dt").FirstOrDefault().GetText() });
                result.Items.Add(new DownloadItem { Name = "specs",       Index = i++,  Type = DownloadItemType.Text, Value = x.SelectNodes(".//dd").GetText() });
            });

上面的代码只是抓住第一行 Item ID: | 72547664 列出所有dt和dd信息有什么问题

Answer 1

你的代码的问题在于，当你第一次想用类Grid获取所有dl元素时，你只用方法FirstOrDefault()获取该类型的DOM元素中的第一个。

i = 0; doc.DocumentNode.SelectNodes("//dl").Where(x => x.HasClass("Grid")).SelectNodes(".//div").ToList().ForEach(x =>
            {
                result.Items.Add(new DownloadItem { Name = "specs-title", Index = i,    Type = DownloadItemType.Text, Value = x.SelectNodes(".//dt").FirstOrDefault().GetText() });
                result.Items.Add(new DownloadItem { Name = "specs",       Index = i++,  Type = DownloadItemType.Text, Value = x.SelectNodes(".//dd").GetText() });
            });

您必须删除FirstOrDefault()才能获取适合您需求的所有元素。