用替代文本 html 敏捷包替换图像

发布于 2024-11-16 19:25:06 字数 699 浏览 4 评论 0原文

我需要解析图像的 HTML 并用一个新标签替换这些标签，该新标签只包含替换中包含的文本。有人可以展示如何使用 linq 和标准用法来做到这一点吗？

我现在使用 linq 示例来替换段落。但是，我收到只读错误。

    HtmlDocument doc = new HtmlDocument();
    doc.LoadHtml(html);      
    IEnumerable<HtmlNode> paragraphs = doc.DocumentNode.DescendantNodes().Where(p => p.Name.ToLower() == "p");
    foreach (HtmlNode p in paragraphs)
    {
        p.InnerText = "Hello World";
    }

还有一种简单的方法可以将其转回文本吗？即输出为字符串

这是我所拥有的不起作用

MemoryStream outStream = new MemoryStream();
doc.Save(outStream);


outStream.Seek(0, SeekOrigin.Begin);
StreamReader reader = new StreamReader( outStream );
string text = reader.ReadToEnd();

原文

I need to parse HTML for images and replace those tags with a new tag that just has the text that is contained in the alternate. Can someone show how to do this with both linq and standard usage?

I've using a linq sample now to replace paragraphs. But, I'm getting a read only error.

    HtmlDocument doc = new HtmlDocument();
    doc.LoadHtml(html);      
    IEnumerable<HtmlNode> paragraphs = doc.DocumentNode.DescendantNodes().Where(p => p.Name.ToLower() == "p");
    foreach (HtmlNode p in paragraphs)
    {
        p.InnerText = "Hello World";
    }

Also is there an easy way to transfer it back to text? I.e Output as string

This is what I have which doesn't work

MemoryStream outStream = new MemoryStream();
doc.Save(outStream);


outStream.Seek(0, SeekOrigin.Begin);
StreamReader reader = new StreamReader( outStream );
string text = reader.ReadToEnd();

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如梦初醒的夏天 2024-11-23 19:25:06

var images = doc.DocumentNode.SelectNodes("//img");
if (images != null)
{
    foreach (HtmlNode image in images)
    {
        var alt = image.GetAttributeValue("alt", "");
        var nodeForReplace = HtmlTextNode.CreateNode(alt);
        image.ParentNode.ReplaceChild(nodeForReplace, image);
    }
}

var sb = new StringBuilder();
using (var writer = new StringWriter(sb))
{
    doc.Save(writer);
}

var images = doc.DocumentNode.SelectNodes("//img");
if (images != null)
{
    foreach (HtmlNode image in images)
    {
        var alt = image.GetAttributeValue("alt", "");
        var nodeForReplace = HtmlTextNode.CreateNode(alt);
        image.ParentNode.ReplaceChild(nodeForReplace, image);
    }
}

var sb = new StringBuilder();
using (var writer = new StringWriter(sb))
{
    doc.Save(writer);
}

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