using System;

using System.Linq;

​

public class atrstr : System.Attribute

{

    public string wartosc

    {

        get;

        set;

    }

​

    public object wartoscint

    {

        get;

        set;

    }

​

    public atrstr()

    {

    }

}

public class atrint : System.Attribute

{

    public atrint()

    {

    }

​

    public object war

    {

        get;

        set;

    }

}

​

​

public class klasa

{

    [atrstr(wartosc = "nazwa",wartoscint=999)]

    public int pole1

    {

        get;

        set;

    }

    [atrint(war=null)]

    public int pole2

    {

        get;

        set;

    }

    [atrint(war=333)]

    public int pole3

    {

        get;

        set;

    }

}

​

​

​

​

​

public static class helper1

{

    public static System.Collections.Generic.List<System.ComponentModel.PropertyDescriptor> getprop<T>(this T t)

    {

        return System.ComponentModel.TypeDescriptor.GetProperties(typeof (T)).OfType<System.ComponentModel.PropertyDescriptor>().ToList();

    }

    public static System.Collections.Generic.List<System.ComponentModel.PropertyDescriptor> getprop(this object t)

    {

        return System.ComponentModel.TypeDescriptor.GetProperties(t.GetType()).OfType<System.ComponentModel.PropertyDescriptor>().ToList();

    }

​

    public static T getAttr<T>(this System.ComponentModel.PropertyDescriptor pd)

    {

        return pd.Attributes.OfType<System.Attribute>().Where(r => r.GetType() == typeof (T)).OfType<T>().FirstOrDefault();

    }

​

    public static System.Nullable<TO> val<T, TO>(this T t, Func<T, System.Nullable<TO>> f)where TO : struct

    {

        return (t == null ? null : f(t));

    }

    public static dynamic valdyn<T>(this T t,Func<T,dynamic> f)

    {

        return (t==null ? null: f(t));

    }

​

    public static TO valnull<T, TO>(this T t, Func<T, TO> f)where TO : class

    {

        return (t == null ? null : f(t));

    }

    /*

    public static TO valdyn2<T,TO>(this T t,Func<T,TO> f)

    {

        return t.getAttr().valdyn<T>(f);

    }

    */

    public static string getatrstr(this System.ComponentModel.PropertyDescriptor pd)

    {

        return pd.getatrdyn<atrstr,string>(r => r.wartosc);//pd.getAttr<atrstr>().valnull<atrstr, string>(r => r.wartosc);

    }

    public static T2 getatrdyn<T,T2>(this System.ComponentModel.PropertyDescriptor pd,Func<T,dynamic> f)

    {

        return pd.getAttr<T>().valdyn<T>(f);

    }

    public static int? getatrint(this System.ComponentModel.PropertyDescriptor pd)

    {

        return pd.getatrdyn<atrint,int?>(r => r.war);//pd.getatrint1();//pd.getAttr<atrint>().val<atrint, int>(r => (int?)r.war);

    }

    public static int getatrint1(this System.ComponentModel.PropertyDescriptor pd)

    {

        return pd.getatrdyn<atrint,int>(r => r.war);//pd.getAttr<atrint>().valdyn<atrint>(r => r.war);

    }

    public static System.Nullable<int> getatrint2(this System.ComponentModel.PropertyDescriptor pd)

    {

        return pd.getatrdyn<atrstr,System.Nullable<int>>(r=>r.wartoscint);//pd.getAttr<atrint>().valdyn<atrint>(r => (System.Nullable<int>)r.war);

    }

    public static dynamic getwardyn<T>(this System.ComponentModel.PropertyDescriptor pd,object obj,Func<object,dynamic> f)

    {

        return new object[1]{pd.GetValue(obj)}.OfType<T>().FirstOrDefault();//.valdyn<object>(f);

    }

    public static T war<T>(this object o,string pole)

    {

        var prop=o.getprop().Where(p=>p.Equals(pole)).FirstOrDefault();

        System.Console.WriteLine("prop.count={0}",prop.GetValue(o));

        if (prop==null) throw new System.Exception("blad");

        return prop.getwardyn<T>(0,r=>(T)r);

    }

}

​

public class Program

{

    public static void Main()

    {

        var k2=new{pole=1,pole2="string",pole3=(int?)4};

        var v1=1;//k2.war<int>("pole");

        var v2=2;//k2.war<string>("pole2");

        var k = new klasa();

        var pd = k.getprop();

        var p1 = pd[0].getatrstr();

        var p1a = pd[0].getatrint2();

        var p2 = pd[1].getatrint();

        var p3 = pd[2].getatrint();

        Console.WriteLine("Hello World, p1:{0},p2:{1},p1a:{2},p3:{3},v1:{4},v2:{5},k2.getprop.count={6}", p1,p2,p1a,p3,1,2,k2.getprop()[0].GetValue(k2));

    }

}