Replace MSDN links

Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;

namespace UpdateMSDNLinks
{
    class Program
    {
        static void Main()
        {
            //string path = @"C:\Users\XXXXXXX\Documents\GitHub\docs-1\docs\framework\migration-guide\net-framework-4-migration-issues.md";

            string path = @"net-framework-4-migration-issues.md";

            var inputLines = File.ReadAllLines(path);
            var outputLines = new List<string>();
            var dict = new Dictionary<string, string>();
            var replacements = 0;

            foreach (var line in inputLines)
            {
                if (line.Contains("msdn.microsoft.com/library"))
                {
                    var r = new Regex(@"\[(.*?)\]\(https://msdn.microsoft.com/library/(.*?)\((.*?)\).aspx\)", RegexOptions.IgnoreCase);
                    var outputLine = line;
                    foreach (var match in r.Matches(line))
                    {
                        var linkText = match.ToString();
                        int startPos = linkText.IndexOf("library/") + 8;
                        int len = linkText.LastIndexOf("(") - startPos;
                        var parsedLinkText = linkText.Substring(startPos, len);

                        if (dict.ContainsKey(parsedLinkText))
                        {
                            outputLine = outputLine.Replace(linkText, dict[parsedLinkText]);
                            replacements++;

                            Console.WriteLine($"Dict: {linkText}");
                        }
                        else
                        {
                            var xrefLink = linkText;
                            WebRequest request = WebRequest.Create($"https://docs.microsoft.com/dotnet/api/{parsedLinkText}");
                            WebResponse response = null;

                            try
                            {
                                response = request.GetResponse();
                                string content = string.Empty;
                                string apiName = string.Empty;

                                using (var reader = new StreamReader(response.GetResponseStream()))
                                {
                                    content = reader.ReadToEnd();
                                }

                                var web = new HtmlAgilityPack.HtmlDocument();
                                web.LoadHtml(content);
                                apiName = web.DocumentNode.SelectNodes("//meta[@name='ms.assetid']")[0].GetAttributeValue("content", String.Empty);
                                xrefLink = $"<xref:{apiName}>";
                                dict.Add(parsedLinkText, xrefLink);

                                outputLine = outputLine.Replace(linkText, xrefLink);
                                replacements++;

                                Console.WriteLine($"Web: {linkText} -> {xrefLink}");
                            }
                            catch (Exception ex)
                            {
                                Console.WriteLine($"{linkText} ({parsedLinkText}) -> {ex.ToString()}");
                            }
                        }
                    }
                    outputLines.Add(outputLine);
                }
                else
                {
                    outputLines.Add(line);
                }
            }
            File.WriteAllLines(path, outputLines);
            Console.WriteLine($"Total Replacements: {replacements}");
        }
    }
}