C# Online Compiler | .NET Fiddle

<no name> by Anonymous

// @nuget: HtmlAgilityPack -Version 1.8.2

using HtmlAgilityPack;
using System;
using System.Collections.Generic;

public class HtmlToTextConverter
{
	// Use CorrespondenceFields here
	private static readonly HashSet<string> CorrespondenceFields = new HashSet<string>
	{
		"shop.name"
	};

	public static string ConvertHtmlToText(string htmlContent)
	{
		var htmlDoc = new HtmlDocument();
		htmlDoc.LoadHtml(htmlContent);
		
		return HtmlNodeToText(htmlDoc.DocumentNode).Trim();
		
	}
	
	public static string HtmlNodeToText(HtmlNode node)
	{
		if (node.NodeType == HtmlNodeType.Text)
		{
			return HtmlEntity.DeEntitize(node.InnerText).Trim();
		}
		
		if (node.NodeType == HtmlNodeType.Element && CorrespondenceFields.Contains(node.Name))
		{
			return $"<{node.OriginalName}>{HtmlNodeToTextChildren(node)}";
		}
		
		return HtmlNodeToTextChildren(node);
	}
	
	private static string HtmlNodeToTextChildren(HtmlNode node)
	{
		string result = "";
		foreach (var child in node.ChildNodes)
		{
			result += HtmlNodeToText(child);
		}
		return result;
	}

}

public class Program
{	
	public static void Main()
	{
		string htmlInput = "<html><body><Shop.Name>Test</body></html>";
		string plainText = HtmlToTextConverter.ConvertHtmlToText(htmlInput);
		Console.WriteLine(plainText);
	}
}

​x
 
// @nuget: HtmlAgilityPack -Version 1.8.2
​
using HtmlAgilityPack;
using System;
using System.Collections.Generic;
​
public class HtmlToTextConverter
{
    // Use CorrespondenceFields here
    private static readonly HashSet<string> CorrespondenceFields = new HashSet<string>
    {
        "shop.name"
    };
​
    public static string ConvertHtmlToText(string htmlContent)
    {
        var htmlDoc = new HtmlDocument();
        htmlDoc.LoadHtml(htmlContent);
        
        return HtmlNodeToText(htmlDoc.DocumentNode).Trim();
        
    }
    
    public static string HtmlNodeToText(HtmlNode node)
    {
        if (node.NodeType == HtmlNodeType.Text)
        {
            return HtmlEntity.DeEntitize(node.InnerText).Trim();
        }
        
        if (node.NodeType == HtmlNodeType.Element && CorrespondenceFields.Contains(node.Name))
        {
            return $"<{node.OriginalName}>{HtmlNodeToTextChildren(node)}";
        }
        
        return HtmlNodeToTextChildren(node);
    }
    
    private static string HtmlNodeToTextChildren(HtmlNode node)
    {
        string result = "";
        foreach (var child in node.ChildNodes)
        {
            result += HtmlNodeToText(child);
        }
        return result;
    }
​
}
​
public class Program
{   
    public static void Main()
    {
        string htmlInput = "<html><body><Shop.Name>Test</body></html>";
        string plainText = HtmlToTextConverter.ConvertHtmlToText(htmlInput);
        Console.WriteLine(plainText);
    }
}

View IL Code