public void ConfigureServices(IServiceCollection services)
 {
     services.AddControllers()
            .AddNewtonsoftJson()
     // ...
}

public class Person
{
   public string FirstName { get; set; }
   public string LastName { get; set; }
   public DateTime? BirthDay { get; set; }
}

using System;
using System.Text.Json.Serialization;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            Person person = JsonSerializer.Parse<Person>(...);
            string json = JsonSerializer.ToString(person);
        }
    }
}

namespace System.Text.Json.Serialization
{
    public static class JsonSerializer
    {
        public static object Parse(ReadOnlySpan<byte> utf8Json, Type returnType, JsonSerializerOptions options = null);
        public static object Parse(string json, Type returnType, JsonSerializerOptions options = null);
        public static TValue Parse<TValue>(ReadOnlySpan<byte> utf8Json, JsonSerializerOptions options = null);
        public static TValue Parse<TValue>(string json, JsonSerializerOptions options = null);

        public static string ToString(object value, Type type, JsonSerializerOptions options = null);
        public static string ToString<TValue>(TValue value, JsonSerializerOptions options = null);
    }
}

public sealed class JsonSerializerOptions
{
   public bool AllowTrailingCommas { get; set; }
   public int DefaultBufferSize { get; set; }
   public JsonNamingPolicy DictionaryKeyPolicy { get; set; }
   public bool IgnoreNullValues { get; set; }
   public bool IgnoreReadOnlyProperties { get; set; }
   public int MaxDepth { get; set; }
   public bool PropertyNameCaseInsensitive { get; set; }
   public JsonNamingPolicy PropertyNamingPolicy { get; set; }
   public JsonCommentHandling ReadCommentHandling { get; set; }
   public bool WriteIndented { get; set; }
}

// Json.NET:
var settings = new JsonSerializerSettings
{
    NullValueHandling = NullValueHandling.Ignore
};
string json = JsonConvert.SerializeObject(person, settings);

// JsonSerializer:
var options = new JsonSerializerOptions
{
    IgnoreNullValues = true
};
string json = JsonSerializer.ToString(person, options);

services.AddControllers()
   .AddJsonOptions(options => options.JsonSerializerOptions.WriteIndented = true);

[JsonPropertyName("birthdate")]
public DateTime? BirthDay { get; set; }

var options = new JsonSerializerOptions
{
   PropertyNamingPolicy = JsonNamingPolicy.CamelCase
};
string json = JsonSerializer.ToString(person, options);

using System.Web;
using System.Web.Mvc;
using System.Web.Helpers;
using System.Globalization;

namespace Parsnet
{
    public class ParsnetModelBinder : DefaultModelBinder
    {
        public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            try
            {
                return base.BindModel(controllerContext, bindingContext);
            }
            catch (HttpRequestValidationException ex)
            {
                var modelState = new ModelState();
                modelState.Errors.Add("اطلاعات ارسالی شما دارای کدهای HTML می‌باشند.");
                var key = bindingContext.ModelName;
                var value = controllerContext.RequestContext.HttpContext.Request.Unvalidated().Form[key];
                modelState.Value = new ValueProviderResult(value, value, CultureInfo.InvariantCulture);
                bindingContext.ModelState.Add(key, modelState);
            }

            return null;
        }
    }
}

    ModelBinders.Binders.DefaultBinder = new ParsnetModelBinder();

var src = new Mat(@"..\..\Images\corridor.jpg", LoadMode.AnyDepth | LoadMode.AnyColor);
var srcCopy = new Mat();
src.CopyTo(srcCopy);
 
var markerMask = new Mat();
Cv2.CvtColor(srcCopy, markerMask, ColorConversion.BgrToGray);
 
var imgGray = new Mat();
Cv2.CvtColor(markerMask, imgGray, ColorConversion.GrayToBgr);
markerMask = new Mat(markerMask.Size(), markerMask.Type(), s: Scalar.All(0));
 
var sourceWindow = new Window("Source (Select areas by mouse and then press space)")
{
    Image = srcCopy
};
 
var previousPoint = new Point(-1, -1);
sourceWindow.OnMouseCallback += (@event, x, y, flags) =>
{
    if (x < 0 || x >= srcCopy.Cols || y < 0 || y >= srcCopy.Rows)
    {
        return;
    }
 
    if (@event == MouseEvent.LButtonUp || !flags.HasFlag(MouseEvent.FlagLButton))
    {
        previousPoint = new Point(-1, -1);
    }
    else if (@event == MouseEvent.LButtonDown)
    {
        previousPoint = new Point(x, y);
    }
    else if (@event == MouseEvent.MouseMove && flags.HasFlag(MouseEvent.FlagLButton))
    {
        var pt = new Point(x, y);
        if (previousPoint.X < 0)
        {
            previousPoint = pt;
        }
 
        Cv2.Line(img: markerMask, pt1: previousPoint, pt2: pt, color: Scalar.All(255), thickness: 5);
        Cv2.Line(img: srcCopy, pt1: previousPoint, pt2: pt, color: Scalar.All(255), thickness: 5);
        previousPoint = pt;
        sourceWindow.Image = srcCopy;
    }
};

Point[][] contours; //vector<vector<Point>> contours;
HiearchyIndex[] hierarchyIndexes; //vector<Vec4i> hierarchy;
Cv2.FindContours(
    markerMask,
    out contours,
    out hierarchyIndexes,
    mode: ContourRetrieval.CComp,
    method: ContourChain.ApproxSimple);

var markers = new Mat(markerMask.Size(), MatType.CV_32S, s: Scalar.All(0));
 
var componentCount = 0;
var contourIndex = 0;
while ((contourIndex >= 0))
{
    Cv2.DrawContours(
        markers,
        contours,
        contourIndex,
        color: Scalar.All(componentCount + 1),
        thickness: -1,
        lineType: LineType.Link8,
        hierarchy: hierarchyIndexes,
        maxLevel: int.MaxValue);
 
    componentCount++;
    contourIndex = hierarchyIndexes[contourIndex].Next;
}

var rnd = new Random();
var colorTable = new List<Vec3b>();
for (var i = 0; i < componentCount; i++)
{
    var b = rnd.Next(0, 255); //Cv2.TheRNG().Uniform(0, 255);
    var g = rnd.Next(0, 255); //Cv2.TheRNG().Uniform(0, 255);
    var r = rnd.Next(0, 255); //Cv2.TheRNG().Uniform(0, 255);
 
    colorTable.Add(new Vec3b((byte)b, (byte)g, (byte)r));
}
 
Cv2.Watershed(src, markers);
 
var watershedImage = new Mat(markers.Size(), MatType.CV_8UC3);
 
// paint the watershed image
for (var i = 0; i < markers.Rows; i++)
{
    for (var j = 0; j < markers.Cols; j++)
    {
        var idx = markers.At<int>(i, j);
        if (idx == -1)
        {
            watershedImage.Set(i, j, new Vec3b(255, 255, 255));
        }
        else if (idx <= 0 || idx > componentCount)
        {
            watershedImage.Set(i, j, new Vec3b(0, 0, 0));
        }
        else
        {
            watershedImage.Set(i, j, colorTable[idx - 1]);
        }
    }
}
 
watershedImage = watershedImage * 0.5 + imgGray * 0.5;
Cv2.ImShow("Watershed Transform", watershedImage);
Cv2.WaitKey(1); //do events

using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;

namespace AngularTemplateDrivenFormsLab.Utils
{
    public class ContentSecurityPolicyMiddleware
    {
        private readonly RequestDelegate _next;

        public ContentSecurityPolicyMiddleware(RequestDelegate next)
        {
            _next = next;
        }

        public Task Invoke(HttpContext context)
        {
            context.Response.Headers.Add("X-Frame-Options", "SAMEORIGIN");
            context.Response.Headers.Add("X-Xss-Protection", "1; mode=block");
            context.Response.Headers.Add("X-Content-Type-Options", "nosniff");

            string[] csp =
            {
              "default-src 'self'",
              "style-src 'self' 'unsafe-inline'",
              "script-src 'self' 'unsafe-inline' 'unsafe-eval'",
              "font-src 'self'",
              "img-src 'self' data:",
              "connect-src 'self'",
              "media-src 'self'",
              "object-src 'self'",
              "report-uri /api/CspReport/Log" //TODO: Add api/CspReport/Log
            };
            context.Response.Headers.Add("Content-Security-Policy", string.Join("; ", csp));
            return _next(context);
        }
    }

    public static class ContentSecurityPolicyMiddlewareExtensions
    {
        /// <summary>
        /// Make sure you add this code BEFORE app.UseStaticFiles();,
        /// otherwise the headers will not be applied to your static files.
        /// </summary>
        public static IApplicationBuilder UseContentSecurityPolicy(this IApplicationBuilder builder)
        {
            return builder.UseMiddleware<ContentSecurityPolicyMiddleware>();
        }
    }
}

public void Configure(IApplicationBuilder app)
{
   app.UseContentSecurityPolicy();

 context.Response.Headers.Add("X-Frame-Options", "SAMEORIGIN");

 context.Response.Headers.Add("X-Xss-Protection", "1; mode=block");

 context.Response.Headers.Add("X-Content-Type-Options", "nosniff");

string[] csp =
            {
              "default-src 'self'",
              "style-src 'self' 'unsafe-inline'",
              "script-src 'self' 'unsafe-inline' 'unsafe-eval'",
              "font-src 'self'",
              "img-src 'self' data:",
              "connect-src 'self'",
              "media-src 'self'",
              "object-src 'self'",
              "report-uri /api/CspReport/Log" //TODO: Add api/CspReport/Log
            };
context.Response.Headers.Add("Content-Security-Policy", string.Join("; ", csp));

 Set-Cookie: sess=abc123; path=/; SameSite

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <rewrite>
      <outboundRules>
        <clear />
        <!-- https://scotthelme.co.uk/csrf-is-dead/ -->
        <rule name="Add SameSite" preCondition="No SameSite">
          <match serverVariable="RESPONSE_Set_Cookie" pattern=".*" negate="false" />
          <action type="Rewrite" value="{R:0}; SameSite=lax" />
          <conditions></conditions>
        </rule>
        <preConditions>
          <preCondition name="No SameSite">
            <add input="{RESPONSE_Set_Cookie}" pattern="." />
            <add input="{RESPONSE_Set_Cookie}" pattern="; SameSite=lax" negate="true" />
          </preCondition>
        </preConditions>
      </outboundRules>
    </rewrite>
  </system.webServer>
</configuration>

   "report-uri /api/CspReport/Log" //TODO: Add api/CspReport/Log

{
  "csp-report": {
    "document-uri": "http://localhost:5000/untypedSha",
    "referrer": "",
    "violated-directive": "script-src",
    "effective-directive": "script-src",
    "original-policy": "default-src 'self'; style-src 'self'; script-src 'self'; font-src 'self'; img-src 'self' data:; connect-src 'self'; media-src 'self'; object-src 'self'; report-uri /api/Home/CspReport",
    "disposition": "enforce",
    "blocked-uri": "eval",
    "line-number": 21,
    "column-number": 8,
    "source-file": "http://localhost:5000/scripts.bundle.js",
    "status-code": 200,
    "script-sample": ""
  }
}

    class CspPost
    {
        [JsonProperty("csp-report")]
        public CspReport CspReport { get; set; }
    }

    class CspReport
    {
        [JsonProperty("document-uri")]
        public string DocumentUri { get; set; }

        [JsonProperty("referrer")]
        public string Referrer { get; set; }

        [JsonProperty("violated-directive")]
        public string ViolatedDirective { get; set; }

        [JsonProperty("effective-directive")]
        public string EffectiveDirective { get; set; }

        [JsonProperty("original-policy")]
        public string OriginalPolicy { get; set; }

        [JsonProperty("disposition")]
        public string Disposition { get; set; }

        [JsonProperty("blocked-uri")]
        public string BlockedUri { get; set; }

        [JsonProperty("line-number")]
        public int LineNumber { get; set; }

        [JsonProperty("column-number")]
        public int ColumnNumber { get; set; }

        [JsonProperty("source-file")]
        public string SourceFile { get; set; }

        [JsonProperty("status-code")]
        public string StatusCode { get; set; }

        [JsonProperty("script-sample")]
        public string ScriptSample { get; set; }
    }

namespace AngularTemplateDrivenFormsLab.Controllers
{
    [Route("api/[controller]")]
    public class CspReportController : Controller
    {
        [HttpPost("[action]")]
        [IgnoreAntiforgeryToken]
        public async Task<IActionResult> Log()
        {
            CspPost cspPost;
            using (var bodyReader = new StreamReader(this.HttpContext.Request.Body))
            {
                var body = await bodyReader.ReadToEndAsync().ConfigureAwait(false);
                this.HttpContext.Request.Body = new MemoryStream(Encoding.UTF8.GetBytes(body));
                cspPost = JsonConvert.DeserializeObject<CspPost>(body);
            }

            //TODO: log cspPost

            return Ok();
        }
    }
}