public enum Grade
    {
        Failing,        // = 0
        BelowAverage,   // = 1
        Average,        // = 2
        VeryGood,       // = 3
        Excellent       // = 4
    }

static void Main(string[] args)
{
    Grade grade = Grade.Average;
    Console.WriteLine(grade.ToString());    // Print Avarage
    Console.WriteLine(grade.ToString("D")); // Print 2
    Console.WriteLine(grade.ToString("X")); // Print 00000002
    Console.WriteLine((int) grade);         //Print 2
    Console.ReadKey();
}

public enum Grade
{
    Failing = 5,
    BelowAverage = 10,
    Average = BelowAverage + 5, // = 15
    VeryGood = 18,
    Excellent = 20
}

public enum Grade : byte
{
    Failing = 5,
    BelowAverage = 10,
    Average = BelowAverage + 5, // = 15
    VeryGood = 18,
    Excellent = 20
}

Console.WriteLine(grade.ToString("X")); // Print 0F

Console.WriteLine("Underlying type: {0}", Enum.GetUnderlyingType(grade.GetType())); // Print System.Byte

Console.WriteLine("Type Code      : {0}", grade.GetTypeCode()); // Print Byte

Console.WriteLine("Value : {0}", (int)grade); // Print 15

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'ngsrc';
}

var user = new User
{
      PhoneNumber = user.PhoneNumber
};
user.Apps.Add(appCode, new ActiveApp
{
       FirstName = "عبدالصالح",
       LastName = "کاشانی",
       UserName = abdossaleh,
       IsActive = true,
       RolesId = new List<string>{"Admin"}
});
await _documentSession.StoreAsync(user);
await _documentSession.SaveChangesAsync()

 _documentSession.Advanced.Increment<User, int>("Users/131-A", x => x.TestProp, 10);
 

_documentSession.Advanced.Defer(new PatchCommandData("Users/131-A", null,
                              new PatchRequest()
                              {
                                    Script = $@"this.Apps[args.appCode] = args.app",
                                    Values =
                                         {
                                              {"appCode", appCode},
                                              {"app", new ActiveApp
                                                   {
                                                        FirstName = "عبدالصالح",
                                                        LastName = "کاشانی",
                                                        UserName = abdossaleh,
                                                        RolesId = new List<string>{"Admin"}
                                                    }
                                              }
                                          }
                              }, null));

Script = "this.Apps[args.app].Roles.splice(args.index,0,args.role)",
Values =
        {
            {
                "index": 1 // مکانی که میخواهیم عملیات انجام شود
                "app", 59
                "role", "User"
            }
        }

splice(args.index,1,args.role)

Script = @"this.Roles= this.Apps[args.app].Roles.filter(role=> role != args.role);",
        Values =
        {
            {"app", 59}
            {"role", "User"}
        }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Text.Json;

namespace BlazorWasm.Client.Utils
{
    public class JwtInfo
    {
        public IEnumerable<Claim> Claims { set; get; }

        public DateTime? ExpirationDateUtc { set; get; }

        public bool IsExpired { set; get; }

        public IEnumerable<string> Roles { set; get; }
    }

    /// <summary>
    /// From the Steve Sanderson’s Mission Control project:
    /// https://github.com/SteveSandersonMS/presentation-2019-06-NDCOslo/blob/master/demos/MissionControl/MissionControl.Client/Util/ServiceExtensions.cs
    /// </summary>
    public static class JwtParser
    {
        public static JwtInfo ParseClaimsFromJwt(string jwt)
        {
            var claims = new List<Claim>();
            var payload = jwt.Split('.')[1];

            var jsonBytes = getBase64WithoutPadding(payload);

            foreach (var keyValue in JsonSerializer.Deserialize<Dictionary<string, object>>(jsonBytes))
            {
                if (keyValue.Value is JsonElement element && element.ValueKind == JsonValueKind.Array)
                {
                    foreach (var itemValue in element.EnumerateArray())
                    {
                        claims.Add(new Claim(keyValue.Key, itemValue.ToString()));
                    }
                }
                else
                {
                    claims.Add(new Claim(keyValue.Key, keyValue.Value.ToString()));
                }
            }

            var roles = getRoles(claims);
            var expirationDateUtc = getDateUtc(claims, "exp");
            var isExpired = getIsExpired(expirationDateUtc);
            return new JwtInfo
            {
                Claims = claims,
                Roles = roles,
                ExpirationDateUtc = expirationDateUtc,
                IsExpired = isExpired
            };
        }

        private static IList<string> getRoles(IList<Claim> claims) =>
            claims.Where(c => c.Type == ClaimTypes.Role).Select(c => c.Value).ToList();

        private static byte[] getBase64WithoutPadding(string base64)
        {
            switch (base64.Length % 4)
            {
                case 2: base64 += "=="; break;
                case 3: base64 += "="; break;
            }
            return Convert.FromBase64String(base64);
        }

        private static bool getIsExpired(DateTime? expirationDateUtc) =>
            !expirationDateUtc.HasValue || !(expirationDateUtc.Value > DateTime.UtcNow);

        private static DateTime? getDateUtc(IList<Claim> claims, string type)
        {
            var exp = claims.SingleOrDefault(claim => claim.Type == type);
            if (exp == null)
            {
                return null;
            }

            var expValue = getTimeValue(exp.Value);
            if (expValue == null)
            {
                return null;
            }

            var dateTimeEpoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
            return dateTimeEpoch.AddSeconds(expValue.Value);
        }

        private static long? getTimeValue(string claimValue)
        {
            if (long.TryParse(claimValue, out long resultLong))
                return resultLong;

            if (float.TryParse(claimValue, out float resultFloat))
                return (long)resultFloat;

            if (double.TryParse(claimValue, out double resultDouble))
                return (long)resultDouble;

            return null;
        }
    }
}

           string source =
           @"
               namespace Foo
               {
                    public class Bar
                    {
                        static void Main(string[] args)
                        {
                            Bar.SayHello();
                        }

                        public static void SayHello()
                        {
                            System.Console.WriteLine(""Hello World"");
                        }
                    }
               }
            ";

using System;
using System.Collections.Generic;
//دو فضای نامی که برای این منظور اضافه شده‌اند
using Microsoft.CSharp;
using System.CodeDom.Compiler;

namespace compilerTest
{
   class Program
   {
       static void compileIt1()
       {
           //سورس کد ما جهت کامپایل
           string source =
           @"
               namespace Foo
               {
                    public class Bar
                    {
                        static void Main(string[] args)
                        {
                            Bar.SayHello();
                        }

                        public static void SayHello()
                        {
                            System.Console.WriteLine(""Hello World"");
                        }
                    }
               }
            ";

           //تعیین نگارش کامپایلر مورد استفاده
           Dictionary<string, string> providerOptions = new Dictionary<string, string>
                {
                    {"CompilerVersion", "v3.5"}
                };
           //تعیین اینکه کد ما سی شارپ است
           CSharpCodeProvider provider = new CSharpCodeProvider(providerOptions);

           //تعیین اینکه خروجی یک فایل اجرایی است بعلاوه مشخص سازی محل ذخیره سازی فایل نهایی
           CompilerParameters compilerParams = new CompilerParameters
           {
               OutputAssembly = "D:\\Foo.EXE",
               GenerateExecutable = true
           };

           //عملیات کامپایل در اینجا صورت می‌گیرد
           CompilerResults results = provider.CompileAssemblyFromSource(compilerParams, source);

           //اگر خطایی وجود داشته باشد نمایش داده خواهد شد
           Console.WriteLine("Number of Errors: {0}", results.Errors.Count);
           foreach (CompilerError err in results.Errors)
           {
               Console.WriteLine("ERROR {0}", err.ErrorText);
           }
       }

       static void Main(string[] args)
       {
           compileIt1();

           Console.WriteLine("Press a key...");
           Console.ReadKey();
       }
   }
}

using System;
using System.Collections.Generic;
using Microsoft.CSharp;
using System.CodeDom.Compiler;
using System.Reflection;

namespace compilerTest
{
   class Program
   {
       static void compileIt2()
       {
           //سورس کد ما جهت کامپایل
           string source =
           @"
               namespace Foo
               {
                    public class Bar
                    {
                        static void Main(string[] args)
                        {
                            Bar.SayHello();
                        }

                        public static void SayHello()
                        {
                            System.Console.WriteLine(""Hello World"");
                        }
                    }
               }
            ";

           //تعیین نگارش کامپایلر مورد استفاده
           Dictionary<string, string> providerOptions = new Dictionary<string, string>
                {
                    {"CompilerVersion", "v3.5"}
                };
           //تعیین اینکه کد ما سی شارپ است
           CSharpCodeProvider provider = new CSharpCodeProvider(providerOptions);

           //نحوه تعیین مشخص سازی کامپایل در حافظه
           CompilerParameters compilerParams = new CompilerParameters
           {
               GenerateInMemory = true,
               GenerateExecutable = false
           };

           //عملیات کامپایل در اینجا صورت می‌گیرد
           CompilerResults results = provider.CompileAssemblyFromSource(compilerParams, source);

           // اگر خطایی در کامپایل وجود نداشت متد دلخواه را فراخوانی می‌کنیم
           if (results.Errors.Count == 0)
           {
               //استفاده از ریفلکشن برای دسترسی به متد و فراخوانی آن
               Type type = results.CompiledAssembly.GetType("Foo.Bar");
               MethodInfo method = type.GetMethod("SayHello");
               method.Invoke(null, null);
           }
       }


       static void Main(string[] args)
       {
           compileIt2();

           Console.WriteLine("Press a key...");
           Console.ReadKey();
       }
   }
}

           string source =
           @"
             namespace Foo
             {
            
                 public class Bar
                 {
                     static void Main(string[] args)
                     {
                         Bar.SayHello();
                     }
            
                     public static void SayHello()
                     {
                         System.Console.WriteLine(""Hello World"");
                         var r = new System.Drawing.Rectangle(0,0,100,100);
                         System.Console.WriteLine(r);             
                     }
                 }
             }
            ";

Number of Errors: 1
ERROR The type or namespace name 'Drawing' does not exist in the namespace 'System' (are you missing an assembly reference?)

compilerParams.ReferencedAssemblies.Add("System.Drawing.Dll");

Expression<Func<string, bool>> f = s => s.Length < 5;

Expression<Func<string, bool>> filter = s => s.Length > 5 && s.Length < 45;

ParameterExpression parameterExpression = Expression.Parameter(typeof(string));
MemberExpression memberExpression = Expression.Property(parameterExpression, "Length");

ConstantExpression greaterThanConstantExpression = Expression.Constant(5);
BinaryExpression greaterThanComparison = Expression.GreaterThan(memberExpression, greaterThanConstantExpression);
var greaterThan = Expression.Lambda<Func<string, bool>>(greaterThanComparison, parameterExpression);

ConstantExpression lessThanConstantExpression = Expression.Constant(45);
BinaryExpression lessThanComparsion = Expression.LessThan(memberExpression, lessThanConstantExpression);
var lessThan = Expression.Lambda<Func<string, bool>>(lessThanComparsion, parameterExpression);

var param = Expression.Parameter(typeof(string), "x");
var body = Expression.AndAlso(
            Expression.Invoke(greaterThan, param),
            Expression.Invoke(lessThan, param)
        );
Expression<Func<string, bool>> filter = Expression.Lambda<Func<string, bool>>(body, param);

Expression<Func<string, bool>> filter = s => s.Length > 5 && s.Length < 45;

public class DynamicModel
{
    public string Name { get; set; }
    public string Comparison { get; set; }
    public object Data { get; set; }
}

public static class ComparisonConstant
{
    public const string LessThan = "LesThan";
    public const string LessThanEqual = "LesThanEqual";
    public const string GreaterThan = "GreaterThan";
    public const string GreaterThanEqual = "GreaterThanEqual";
    public const string Equal = "Equal";
    public const string NotEqual = "NotEqual";
}

public static IQueryable<TModel> DynamicFilter<TModel>(this IQueryable<TModel> iqueryable, IEnumerable<DynamicModel> dynamicModel)
{
    return iqueryable.Where(Filter<TModel>(dynamicModel));
}  

public static Expression<Func<TModel, bool>> Filter<TModel>(IEnumerable<DynamicModel> dynamicModel)
{
    Expression<Func<TModel, bool>> result = a => true;
    foreach (var item in dynamicModel)
    {
        ParameterExpression parameterExpression = Expression.Parameter(typeof(TModel));
        MemberExpression memberExpression = Expression.Property(parameterExpression, item.Name);
        ConstantExpression constantExpression = Expression.Constant(item.Data);
        BinaryExpression comparison = GetBinaryExpression(item.Comparison, memberExpression, constantExpression);
        var expression = Expression.Lambda<Func<TModel, bool>>(comparison, parameterExpression);
        var param = Expression.Parameter(typeof(TModel), "x");
        var body = Expression.AndAlso(
                    Expression.Invoke(result, param),
                    Expression.Invoke(expression, param)
                );
        result = Expression.Lambda<Func<TModel, bool>>(body, param);
    }
    return result;
}

private static BinaryExpression GetBinaryExpression(string comparison, MemberExpression memberExpression, ConstantExpression constantExpression)
{
    switch (comparison)
    {
        case ComparisonConstant.Equal:
            return Expression.Equal(memberExpression, constantExpression);
        case ComparisonConstant.LessThan:
            return Expression.LessThan(memberExpression, constantExpression);
        case ComparisonConstant.GreaterThan:
            return Expression.GreaterThan(memberExpression, constantExpression);
        case ComparisonConstant.NotEqual:
            return Expression.NotEqual(memberExpression, constantExpression);
        case ComparisonConstant.GreaterThanEqual:
            return Expression.GreaterThanOrEqual(memberExpression, constantExpression);
        case ComparisonConstant.LessThanEqual:
            return Expression.LessThanOrEqual(memberExpression, constantExpression);
        default:
            return null;
    }
}

[
   {
      "Name":"Title",
      "Comparison":"Equal",
      "Data":"Hi"
   },
   {
      "Name":"Id",
      "Comparison":"LesThanEqual",
      "Data": 100
   }
]

var categories = _dbContext.Categories
                         .DynamicFilter(filter)//filter => IEnumerable<DynamicModel>
                         .ToList();