redirect browser source to load a local modified file

hello, so i have sample code for windows for c#:

using CefSharp;
using CefSharp.Handler;
using CefSharp.WinForms;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Windows.Forms;

namespace FlymerLite
{
	public class frmFlymerLite : Form
	{
		private IContainer components = null;

		private ChromiumWebBrowser browser;

		public frmFlymerLite()
		{
			CefSharpSettings.set_WcfEnabled(true);
			CefSettings cefSetting = new CefSettings();
			cefSetting.set_CachePath(Path.GetFullPath("cache"));
			Cef.Initialize(cefSetting);
			this.InitializeComponent();
		}

		private void browser_LoadingStateChanged(object sender, LoadingStateChangedEventArgs e)
		{
		}

		protected override void Dispose(bool disposing)
		{
			if ((!disposing ? false : this.components != null))
			{
				this.components.Dispose();
			}
			base.Dispose(disposing);
		}

		private void frmFlymerLite_Load(object sender, EventArgs e)
		{
			frmFlymerLite.RedirectionRequestHandler handler = new frmFlymerLite.RedirectionRequestHandler();
			handler.AddRedirection("http://www.flyordie.com/games/online/c/game5.html?664", "js\\online\\c\\game5[664].html");
			handler.AddRedirection("http://www.flyordie.com/games/deploy/pool/180910/code.jz", "js\\deploy\\pool\\180910\\code.jz");
			handler.AddRedirection("http://www.flyordie.com/games/deploy/snooker/180910/code.jz", "js\\deploy\\snooker\\180910\\code.jz");
			this.browser.set_RequestHandler(handler);
			this.browser.Load("http://www.flyordie.com/games/online/games.html?game=8Ball");
		}

		private void InitializeComponent()
		{
			this.browser = new ChromiumWebBrowser();
			base.SuspendLayout();
			this.browser.set_ActivateBrowserOnCreation(false);
			this.browser.Dock = DockStyle.Fill;
			this.browser.Location = new Point(0, 0);
			this.browser.Name = "browser";
			this.browser.Size = new System.Drawing.Size(1140, 600);
			this.browser.TabIndex = 0;
			this.browser.add_LoadingStateChanged(new EventHandler<LoadingStateChangedEventArgs>(this.browser_LoadingStateChanged));
			base.AutoScaleDimensions = new SizeF(6f, 13f);
			base.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
			base.ClientSize = new System.Drawing.Size(1140, 600);
			base.Controls.Add(this.browser);
			base.Name = "frmFlymerLite";
			this.Text = "Flymer Lite";
			base.Load += new EventHandler(this.frmFlymerLite_Load);
			base.ResumeLayout(false);
		}

		private class FilePathResourceRequestHandler : ResourceRequestHandler
		{
			private string filePath;

			public FilePathResourceRequestHandler(string filePath)
			{
				this.filePath = filePath;
			}

			protected override IResourceHandler GetResourceHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request)
			{
				return ResourceHandler.FromFilePath(this.filePath, null, false);
			}
		}

		public class MyCustomLifeSpanHandler : ILifeSpanHandler
		{
			public MyCustomLifeSpanHandler()
			{
			}

			public bool DoClose(IWebBrowser chromiumWebBrowser, IBrowser browser)
			{
				return true;
			}

			public void OnAfterCreated(IWebBrowser chromiumWebBrowser, IBrowser browser)
			{
			}

			public void OnBeforeClose(IWebBrowser chromiumWebBrowser, IBrowser browser)
			{
			}

			public bool OnBeforePopup(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, string targetUrl, string targetFrameName, WindowOpenDisposition targetDisposition, bool userGesture, IPopupFeatures popupFeatures, IWindowInfo windowInfo, IBrowserSettings browserSettings, ref bool noJavascriptAccess, out IWebBrowser newBrowser)
			{
				browser.get_MainFrame().LoadUrl(targetUrl);
				newBrowser = null;
				return true;
			}
		}

		public class RedirectionRequestHandler : RequestHandler
		{
			private Dictionary<string, string> redirections;

			public RedirectionRequestHandler()
			{
				this.redirections = new Dictionary<string, string>();
			}

			public void AddRedirection(string url, string filePath)
			{
				this.redirections.Add(url, filePath);
			}

			public void ClearRedirections()
			{
				this.redirections.Clear();
			}

			public bool ContainsUrl(string url)
			{
				return this.redirections.ContainsKey(url);
			}

			public string GetFilePath(string url)
			{
				return this.redirections[url];
			}

			protected override IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
			{
				IResourceRequestHandler filePathResourceRequestHandler;
				if (!this.redirections.ContainsKey(request.get_Url()))
				{
					filePathResourceRequestHandler = null;
				}
				else
				{
					filePathResourceRequestHandler = new frmFlymerLite.FilePathResourceRequestHandler(this.redirections[request.get_Url()]);
				}
				return filePathResourceRequestHandler;
			}

			public bool RemoveUrl(string url)
			{
				return this.redirections.Remove(url);
			}
		}
	}
}

my question is how would i make this for mac os via xcode or visual studio?

keep getting errors im trying to simply make a web site load my editied modified file instead of there own file on the server?