“new” keyword in property declaration in c#

Question

I\'ve been given a .net project to maintain. I was just browsing through the code and I noticed this on a property declaration:

public new string navUrl
{
           


        

Answer 1

This is also documented here.

Code snippet from msdn.

public class BaseClass
{
    public void DoWork() { }
    public int WorkField;
    public int WorkProperty
    {
        get { return 0; }
    }
}

public class DerivedClass : BaseClass
{
    public new void DoWork() { }
    public new int WorkField;
    public new int WorkProperty
    {
        get { return 0; }
    }
}    

DerivedClass B = new DerivedClass();
B.WorkProperty;  // Calls the new property.

BaseClass A = (BaseClass)B;
A.WorkProperty;  // Calls the old property.

Answer 2

new is hiding the property.

It might be like this in your code:

class base1
{
    public virtual string navUrl
    {
        get;
        set;
    }
}

class derived : base1
{
    public new string navUrl
    {
        get;
        set;
    }
}

Here in the derived class, the navUrl property is hiding the base class property.

Answer 3

Some times referred to as Shadowing or method hiding; The method called depends on the type of the reference at the point the call is made. This might help.

Answer 4

https://msdn.microsoft.com/en-us/library/435f1dw2.aspx

Look at the first example here, it gives a pretty good idea of how the new keyword can be used to mask base class variables

Answer 5

It hides the navUrl property of the base class. See new Modifier. As mentioned in that MSDN entry, you can access the "hidden" property with fully qualified names: BaseClass.navUrl. Abuse of either can result in massive confusion and possible insanity (i.e. broken code).