获取具有特定属性的表的HTML源代码 [英] Get HTML source code of table with specific attribute

问题描述

我试图获取具有特定属性的表格的HTML源代码。
下面的代码将帮助您更好地理解。

  public static async任务GetCldInfos（）
 {
 string sURL = @https://www.investing.com/economic-calendar/; 
 using（HttpClient clientduplicate = new HttpClient（））
 {
 clientduplicate.DefaultRequestHeaders.Add（User-Agent，
Mozilla / 5.0（compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident / 6.0））; 
 
 using（HttpResponseMessage responseduplicate = await clientduplicate.GetAsync（sURL））
 using（HttpContent contentduplicate = responseduplicate.Content）
 {
 try 
 {
字符串resultduplicate =等待contentduplicate.ReadAsStringAsync（）; 
 
 // var websiteduplicate = new HtmlDocument（）; 
 //websiteduplicate.LoadHtml(resultduplicate）; 
 Debug.WriteLine（resultduplicate）; 
} 
 catch（Exception ex1）
 {
 throw ex1.InnerException; 
} 
} 
} 
} 
  

我们访问此处，我们可以选择设置时间范围。
我们选择的时间表相应地修改了表格。
当我做一个http请求来获取源代码时，它会自动给我格林威治标准时间格林威治时间-5：00。

我如何获取源代码例如格林尼治标准时间0:00？

解决方案

使用HTML Agility Pack，您可以使用以下扩展方法获取特定元素具有特定属性：

  public static IEnumerable< HtmlNode> GetNodesByAttr（这个HtmlDocument htmlDoc，字符串标签，字符串attributeName，字符串attributeValue）
 {
 var allTags = htmlDoc.DocumentNode.Descendants（tag）; 
 
返回（来自htmlNode in allTags 
选择htmlNode.Attributes 
到attrs 
 attrrs 
其中attr.Name == attributeName&& amp ; attr.Value == attributeValue 
 select attr）.Select（attr => attr.OwnerNode）.ToList（）; 
 
 
 
 
 $ b 
例如，如果你想找到表格 class  gmt0，您可以像这样调用扩展方法： 
 
 
  var websiteduplicate = new HtmlDocument（）; 
 websiteduplicate.LoadHtml（resultduplicate）; 
 
 var myElement = websiteduplicate.GetNodesByAttr（table，class，gmt0）。FirstOrDefault（）; 
  
 
I am trying to get the HTML source code of a table with a specific attribute.
The code below will help you understand more.
public static async Task GetCldInfos()
{
    string sURL = @"https://www.investing.com/economic-calendar/";
    using (HttpClient clientduplicate = new HttpClient())
    {
        clientduplicate.DefaultRequestHeaders.Add("User-Agent",
            "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident / 6.0)");

        using (HttpResponseMessage responseduplicate = await clientduplicate.GetAsync(sURL))
        using (HttpContent contentduplicate = responseduplicate.Content)
        {
            try
            {
                string resultduplicate = await contentduplicate.ReadAsStringAsync();

                //var websiteduplicate = new HtmlDocument();
                //websiteduplicate.LoadHtml(resultduplicate);
                Debug.WriteLine(resultduplicate);
            }
            catch (Exception ex1)
            {
                throw ex1.InnerException;
            }
        }
    }
}
When we visit here we have an option to set the time frame.
The timeframe we chose modifies the table accordingly. 
When I do an http request to get the source it automatically gives me the standard GMT which is GMT -5:00.


How can I get the source for example with GMT 0:00?
解决方案
With HTML Agility Pack, you can use the following extension method to get a specific element with a specific attribute:
    public static IEnumerable<HtmlNode> GetNodesByAttr(this HtmlDocument htmlDoc, string tag, string attributeName, string attributeValue)
    {
        var allTags = htmlDoc.DocumentNode.Descendants(tag);

        return (from htmlNode in allTags
                select htmlNode.Attributes
                    into attrs
                    from attr in attrs
                    where attr.Name == attributeName && attr.Value == attributeValue
                    select attr).Select(attr => attr.OwnerNode).ToList();

    }
For example, if you want to find table with class "gmt0", you can call the extension method like this:
var websiteduplicate = new HtmlDocument();
websiteduplicate.LoadHtml(resultduplicate);

var myElement = websiteduplicate.GetNodesByAttr("table", "class", "gmt0").FirstOrDefault();


                        
这篇关于获取具有特定属性的表的HTML源代码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！