C# 正则根据某个class 匹配所有html元素

Question

<a onclick="" id="ContentPlaceHolder1_rpt_list_LinkButton2_0" class="btn btn-danger btn-xs delete ROLE_Button_SaveSysConfig" href="" style="display: inline-block;">保存</a>

<input type="text" onclick="" id="ContentPlaceHolder1_rpt_list_LinkButton2_0" class="btn btn-danger btn-xs delete ROLE_Button_SaveSysConfig" href="" style="display: inline-block;" />

根据class包含 “ROLE_Button_SaveSysConfig” 匹配出上面的元素，不一定是a标签不一定是input，有可能是div，li span 等等，只要class包含了 就匹配出来这个闭合元素

Answer 1

可以使用 AngleSharp ，示例代码如下：

class Program
{
    static async Task Main(string[] args)
    {
        var html = @"<a onclick="""" id=""ContentPlaceHolder1_rpt_list_LinkButton2_0"" class=""btn btn-danger btn-xs delete ROLE_Button_SaveSysConfig"" href="""" style=""display: inline-block;"">保存</a>
                        <input type=""text"" onclick="""" id=""ContentPlaceHolder1_rpt_list_LinkButton2_0"" class=""btn btn-danger btn-xs delete ROLE_Button_SaveSysConfig"" href="""" style=""display: inline-block;"" />";

        var context = BrowsingContext.New(Configuration.Default);
        var document = await context.OpenAsync(req => req.Content(html));
        var elements = document.QuerySelectorAll(".ROLE_Button_SaveSysConfig");
        foreach(var element in elements)
        {
            Console.WriteLine(element.Id);
        }
    }
}

Answer 2

换HtmlAgilityPack 解决了

Answer 3

换个方式：HtmlAgilityPack + Linq 简洁方便。