tinylit / codearts

    var guid = "0bbd0503-4879-42de-8cf0-666537b642e2".CastTo<Guid?>();// success

    var list = new List<string> { "11111", "2111", "3111" };

    var stack = list.CastTo<Stack<string>>();// success

    var listInt = list.CastTo<List<int>>();// success

    var quene = list.CastTo<Queue<int>>();// success

    var queneGuid = list.CastTo<Queue<Guid>>(); // fail => null

    public class CopyTest
    {
        public int Id { get; set; }

        public string Name { get; set; }
    }

    public class CopyToTest : CopyTest
    {
        public DateTime Date { get; set; }
    }

    public class MapToTest
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public DateTime Date { get; set; }
    }

    var value = new CopyToTest
    {
        Id = 1000,
        Name = "test",
        Date = DateTime.Now
    };

    var copy1 = value.CopyTo(); // success
    var copy2 = value.CopyTo<CopyTest>(); // success

    var value = new CopyToTest
    {
        Id = 1000,
        Name = "test",
        Date = DateTime.Now
    };

    var map1 = value.MapTo<CopyTest>(); // success

    var map2 = value.MapTo<MapToTest>(); // success

    var map3 = value.MapTo<IEnumerable<KeyValuePair<string, object>>>(); // success

    var map4 = value.MapTo<ICollection<KeyValuePair<string, object>>>(); // success

    var map5 = value.MapTo<Dictionary<string, object>>(); // success

    var copyTo = new CopyToExpression();

    //? Specify the proxy for the target type of "CopyTest".
    copyTo.Use((profile, type) =>
    {
        if (type == typeof(CopyToTest))
        {
            return source =>
            {
                var copy = (CopyTest)source;

                return new CopyTest
                {
                    Id = copy.Id,
                    Name = copy.Name
                };
            };
        }
        return profile.Create<CopyTest>(type);
    });

    RuntimeServicePools.TryAddSingleton<ICopyToExpression>(() => copyTo);

    var mapTo = RuntimeServicePools.Singleton<IMapToExpression, MapToExpression>();

    //? Specify an agent of type "CopyToTest" to type "CopyTest".
    mapTo.Absolute<CopyToTest, CopyTest>(source =>
    {
        return new CopyTest
        {
            Id = source.Id,
            Name = source.Name
        };
    });

    //? Type "CopyTest" by specifying an agent of type "CopyToTest" or a subclass of "CopyToTest".
    mapTo.Run<CopyToTest, MapToTest>(source =>
    {
        return new MapToTest
        {
            Id = source.Id,
            Name = source.Name,
            Date = source.Date
        };
    });

    var castTo = RuntimeServicePools.Singleton<ICastToExpression, CastToExpression>();

    mapTo.Map<string>(sourceType => sourceType.IsValueType ,source => source.ToString());

	var of = ProxyGenerator.Of<IEmitTest>(new ProxyOptions(new NonIsByRefMethodsHook())); // Generate interface proxy.
	
	var instance = new EmitTest(); // Interface implementation class.
	
	var interceptor = new Interceptor(); // The interceptor.

	var proxy = of.Of(instance, interceptor); //Gets the interface proxy instance for the specified instance.

	var of = ProxyGenerator.New<EmitTest>(new ProxyOptions(new NonIsByRefMethodsHook())); // Generate class proxy.
	
	var interceptor = new Interceptor(); // The interceptor.

	var proxy = of.New(interceptor); // Gets an instance of a proxy.

	var of = ProxyGenerator.CreateInstance<EmitTest>(new ProxyOptions(new NonIsByRefMethodsHook())); // Generate class proxy.

	var interceptor = new Interceptor(); // The interceptor.

	var proxy = of.CreateInstance(interceptor, ...args/* The constructor parameter of the proscribed class. */); // Gets an instance of a proxy.

    [Naming(NamingType.UrlCase, Name = "yep_users")] // 指定整个实体的字段格式，指定当前实体映射表名称。
    public class User : BaseEntity<int> // 必须继承IEntity接口或实现了IEntity接口的类。
    {
        [Key] // 指定主键（用户操作更新和删除）
        [Naming("uid")] // 字段映射，将字段Id和数据库user字段添加映射关系。
        [ReadOnly(true)] //指定字段只读，字段值由数据库生成，不被插入或更新。
        public override int Id { get => base.Id; set => base.Id = value; }

        [Required] //设置字段必填
        [Display(Name = "用户名")] // 遵循 System.ComponentModel.DataAnnotations.ValidationAttribute 约束
        public string Username { get; set; }

        [Naming(NamingType.CamelCase)] // 如果字段特殊，可单独为字段设置字段命名规则。
        [DateTimeToken] // 设置Token键（在更新时，将属性数据作为更新条件，并为属性创建新值；在插入时，如若属性值为类型默认值，会自动获取新值）
        public DateTime PasswordLastChanged { get; set; }
    }

    DbConnectionManager.RegisterAdapter(new SqlServerAdapter());
    DbConnectionManager.RegisterProvider<CodeArtsProvider>();

    var y1 = 100;
    var str = "1";
    Prepare();
    var user = new UserRepository();
    var details = new UserDetailsRepository();
    var userWx = new UserWeChatRepository();
    var result = from x in user
                    join y in details on x.Id equals y.Id
                    join z in userWx on x.Id equals z.Uid
                    where x.Id > 0 && y.Id < y1 && x.Username.Contains(str)
                    orderby x.Id, y.Registertime descending
                    select new { x.Id, OldId = x.Id + 1, z.Openid };

    var list = result.ToList();