Entity types with constructors | C# Online Compiler

Entity types with constructors by Mohammad Reza

using System;

using System.Text.Json;
using Microsoft.EntityFrameworkCore;
using Microsoft.Data.Sqlite;
using System.Linq;

public class UserEntity
    {
        //1.why query will call the constructor?
        public UserEntity(string name, string password) {
            Id=Guid.NewGuid();
            Name = name;
            Salt = Guid.NewGuid().ToString();
            //2.why [Password] is different,what is the rule
            Password = Salt;
        }
        public Guid Id { get; set; }
        public string Name { get; set; }
        public string Password { get; set; }
        public string Salt { get; set; }
    }
public class MyDbContext:DbContext
{
    public MyDbContext(DbContextOptions<MyDbContext> options)
        : base(options)
    {
        Database.EnsureCreated();
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
    }
    public DbSet<UserEntity> User { get; set; }
}
public class Program
{
	public static void Main()
	{
		//config database context by sqlite
		var connection = new SqliteConnection("DataSource=:memory:");
            connection.Open();
            var options = new DbContextOptionsBuilder<MyDbContext>()
                    .UseSqlite(connection)
                    .Options;
		
		using (var context = new MyDbContext(options))
		{
			var admin = new UserEntity("admin", "admin123");
			
            Console.WriteLine(JsonSerializer.Serialize(admin));
            context.User.Add(admin);
            context.SaveChanges();
		}	
		using (var context = new MyDbContext(options))
		{
            var user = context.User.FirstOrDefault();
			
            Console.WriteLine(user == null ? "" : JsonSerializer.Serialize(user));
		}	
	}
}

​x
 
using System;
​
using System.Text.Json;
using Microsoft.EntityFrameworkCore;
using Microsoft.Data.Sqlite;
using System.Linq;
​
public class UserEntity
    {
        //1.why query will call the constructor?
        public UserEntity(string name, string password) {
            Id=Guid.NewGuid();
            Name = name;
            Salt = Guid.NewGuid().ToString();
            //2.why [Password] is different,what is the rule
            Password = Salt;
        }
        public Guid Id { get; set; }
        public string Name { get; set; }
        public string Password { get; set; }
        public string Salt { get; set; }
    }
public class MyDbContext:DbContext
{
    public MyDbContext(DbContextOptions<MyDbContext> options)
        : base(options)
    {
        Database.EnsureCreated();
    }
​
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
    }
​
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
    }
    public DbSet<UserEntity> User { get; set; }
}
public class Program
{
    public static void Main()
    {
        //config database context by sqlite
        var connection = new SqliteConnection("DataSource=:memory:");
            connection.Open();
            var options = new DbContextOptionsBuilder<MyDbContext>()
                    .UseSqlite(connection)
                    .Options;
        
        using (var context = new MyDbContext(options))
        {
            var admin = new UserEntity("admin", "admin123");
            
            Console.WriteLine(JsonSerializer.Serialize(admin));
            context.User.Add(admin);
            context.SaveChanges();
        }   
        using (var context = new MyDbContext(options))
        {
            var user = context.User.FirstOrDefault();
            
            Console.WriteLine(user == null ? "" : JsonSerializer.Serialize(user));
        }   
    }
}

Compilation error (line 4, col 7): The type or namespace name 'Json' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 36, col 21): The type or namespace name 'JsonSchema' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 51, col 28): The type or namespace name 'JsonSchema' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 22, col 26): The name 'JsonSchema' does not exist in the current context
Compilation error (line 36, col 51): The type or namespace name 'JsonSchemaBuilder' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 37, col 25): The type or namespace name 'Dictionary<,>' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 37, col 44): The type or namespace name 'JsonSchema' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 39, col 28): The type or namespace name 'JsonSchemaBuilder' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 40, col 31): The name 'SchemaValueType' does not exist in the current context
Compilation error (line 43, col 28): The type or namespace name 'JsonSchemaBuilder' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 44, col 31): The name 'SchemaValueType' does not exist in the current context
Compilation error (line 51, col 59): The type or namespace name 'JsonSchemaBuilder' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 52, col 15): The name 'SchemaValueType' does not exist in the current context
Compilation error (line 53, col 17): The name 'MetaSchemas' does not exist in the current context
Compilation error (line 56, col 25): The type or namespace name 'Dictionary<,>' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 56, col 44): The type or namespace name 'JsonSchema' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 59, col 30): The type or namespace name 'JsonSchemaBuilder' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 60, col 23): The name 'SchemaValueType' does not exist in the current context
Compilation error (line 67, col 32): The type or namespace name 'JsonSchemaBuilder' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 68, col 23): The name 'SchemaValueType' does not exist in the current context
Compilation error (line 75, col 31): The type or namespace name 'JsonSchemaBuilder' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 76, col 23): The name 'SchemaValueType' does not exist in the current context
Compilation error (line 78, col 28): The type or namespace name 'JsonSchemaBuilder' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 79, col 25): The type or namespace name 'JsonSchemaBuilder' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 83, col 19): The type or namespace name 'Dictionary<,>' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 83, col 38): The type or namespace name 'JsonSchema' could not be found (are you missing a using directive or an assembly reference?)

Last Run:	10:18:09 pm
Compile:	0.007s
Execute:	0s
Memory:	0b
CPU:	0s

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