Cef Sharp json protocol snippet

JsonComand.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;

namespace TransportProto
{
    public class JsonComand
    {
        public string Command { get; set; }
        public string Data { get; set; }
    }

    public class JsonComandTransportProto
    {
       static public JsonComand FromString(string json)
        {
            return JsonConvert.DeserializeObject<JsonComand>(json);
        }

    }
}

mapper.js

var src_path_array = []
var button_ids_array = []
var targetElements = document.querySelectorAll('.block-video.block');

for (var i = 0; i < targetElements.length; i++) {
    var downloadButton = document.createElement('button');
    downloadButton.style.borderRadius = '10px';
    downloadButton.style.padding = '10px 20px';
    downloadButton.style.background = 'blue';
    downloadButton.style.color = 'white';
    downloadButton.innerText = 'Cкачать';
    downloadButton.style.position = 'absolute';
    downloadButton.style.right = '0';
    downloadButton.style.top = '0';
    var content_preview = targetElements[i].querySelector('video');
    var srcValue = content_preview.getAttribute('src');
    src_path_array.push(srcValue);
    button_ids_array.push(downloadButton.id);
    downloadButton.id = i.toString();
    downloadButton.addEventListener('click', function () {
        var command = {
            "Command": "download",
            "Data": window.location.origin + src_path_array[Number(this.id)],
        };
        var jsonString = JSON.stringify(command);
        CefSharp.PostMessage(jsonString);
        console.log(src_path_array[Number(this.id)]);
    });
    targetElements[i].appendChild(downloadButton);
}


for(var i = 0; i < targetElements.length; i++) {
    var downloadButton = document.createElement('button');
    downloadButton.style.borderRadius = '10px';
    downloadButton.style.padding = '10px 20px';
    downloadButton.style.background = 'green';
    downloadButton.style.color = 'white';
    downloadButton.innerText = 'Воспроизвести';
    downloadButton.style.position = 'absolute';
    downloadButton.style.left = '0';
    downloadButton.style.top = '0';
    var content_preview = targetElements[i].querySelector('video');
    var srcValue = content_preview.getAttribute('src');
    src_path_array.push(srcValue);
    button_ids_array.push(downloadButton.id);
    downloadButton.id = i.toString();
    downloadButton.addEventListener('click', function () {
        var command = {
            "Command": "play",
            "Data": window.location.origin + src_path_array[Number(this.id)],
        };
        var jsonString = JSON.stringify(command);
        CefSharp.PostMessage(jsonString);
        console.log(src_path_array[Number(this.id)]);
    });
    targetElements[i].appendChild(downloadButton);
}

MessageProcessing.cs

  private void Browser_JavascriptMessageReceived(object sender, JavascriptMessageReceivedEventArgs e)
  {
      if (e.Message == null) { return; }
      var payload = (string)e.Message;

      try
      {
          JsonComand cmd = JsonComandTransportProto.FromString(payload);
          if (cmd == null) { return; }
          if (cmd.Command == "download")
          {

              Task task = Task.Run(async () =>
              {
                  browser_view.StartDownload(cmd.Data);
              });

          }

          if (cmd.Command == "play")
          {
              string m = cmd.Data;
              string path_bin = "BMVLPlayer.exe";
              string arguments = "-m=" + m;
              ProcessStartInfo Player = new ProcessStartInfo { FileName = path_bin, Arguments = arguments };
              try
              {
                  Process.Start(Player);
              }
               catch(Exception ex)
              {
                  logger.Error(ex.Message);
              }

          }

      }
      catch (Exception ex){ logger.Error(ex.Message); }
  }
  
  browser_view.JavascriptObjectRepository.Settings.LegacyBindingEnabled = true;
  browser_view.JavascriptMessageReceived += Browser_JavascriptMessageReceived;