use derived class object in base class

Question

I have a base class which contain helper method, and I have some derived classes which contain some virtual methods.

so, I want to know how can I use the derived class object in the base classes virtual methods?

derived class

 class myclass :baseClass
{
    public string id { get; set; }

    public string name { get; set; }

}

base class

public abstract class baseClass
{

    public virtual object FromStream()
    {
        string name, type;

        List<PropertyInfo> props = new List<PropertyInfo>(typeof(object).GetProperties()); // here I need to use derived class object 

        foreach (PropertyInfo prop in props)
        {
            type = prop.PropertyType.ToString();
            name = prop.Name;

            Console.WriteLine(name + " as "+ type);
        }
        return null;
    }

main

 static void Main(string[] args)
    {
        var myclass = new myclass();
        myclass.FromStream(); // the object that I want to use it 

        Console.ReadKey();
    }

Answer 1

As the method FromStream is checking the properties of an object, I think you could use generics.

Example Code:

public abstract class BaseClass
{
    public virtual object FromStream<T>(string line)
    {
        string name, type;

        List<PropertyInfo> props = new List<PropertyInfo>(typeof(T).GetProperties()); 

        foreach (PropertyInfo prop in props)
        {
            type = prop.PropertyType.ToString();
            name = prop.Name;

            Console.WriteLine(name + " as " + type);
        }
        return null;
    }
}

public class MyClass : BaseClass
{
    public string id { get; set; }

    public string name { get; set; }
}

To consume:

var myclass = new MyClass();
myclass.FromStream<MyClass>("some string"); 

Any type of which the properties needs to be checked can be passed in by doing so:

public virtual object FromStream<T>(string line)

---

EDIT: Please also note that you can follow the approach mentioned by @Jon Skeet - i.e to use GetType().GetProperties()

In that case you could write the FromStream method as below:

public virtual object FromStream(string line)
{
    string name, type;

    List<PropertyInfo> props = new List<PropertyInfo>(GetType().GetProperties()); 

    foreach (PropertyInfo prop in props)
    {
        type = prop.PropertyType.ToString();
        name = prop.Name;

        Console.WriteLine(name + " as " + type);
    }
    return null;
}