Difference between new & passing Type of the object

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Hello Every One,
I am having One ResultClass in my project.
I am creating the object of that class

XML

<pre lang="c#">ResultClass r=new ResultClass();</pre>

one more thing i am doing is

<pre lang="cs">
//m_ResultList is temp resultclass object
ResultClass m_RecedResult = (ResultContainer)m_ResultList[0];
               m_ResultList.RemoveAt(0);</pre>

now i am not understanding the difference between this both statement.what is difference between new keyword and type of obj passing.

Posted 8-Mar-14 18:53pm

Member 8825505

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Sergey Alexandrovich Kryukov 9-Mar-14 1:03am

The question does not make sense. This is the same as to ask "what is the difference between newborn and elementary school?". :-)
Forget about "difference"; you won't be able to explain what it is supposed to mean. Ask what do you fail to understand in first and second case, exactly.

And could you tell us: if you have no idea on the very basics, how did you managed to become an author of 10 answers on this forum? I don't want to review them, but I would not trust you as an expert... Please, feel some responsibility for your answers...

—SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2014-03-08T19:11:00

In first case, you create an instance of some class using the class constructor and assign a reference to the variable. In second case, you try to get a reference to the instance which was created (instantiated) some time ago, with type case. Note that it can be unsuccessful and throw one or another exception. First, a collection might be empty, then indexing at zero would be out if index range, and the actual runtime type of the collection element might be different, that would throw a type cast exception.

If you did not understand such elementary things, you should stop doing what you are doing and read some book/documentation on programming, .NET and the language, otherwise you won't get anything exception frustration.

—SA

Krunal Rohit · Accepted Answer · 2014-03-08T19:05:00

new :
the new keyword can be used as an operator, a modifier, or a constraint.

new Operator : Used to create objects and invoke constructors.
Animal an = new Animal();

new Modifier : Used to hide an inherited member from a base class member.

public class BaseC<br />
{<br />
public int x;<br />
public void Invoke() { }<br />
}<br />
public class DerivedC : BaseC<br />
{<br />
new public void Invoke() { }<br />
}

new Constraint : Used to restrict types that might be used as arguments for a type parameter in a generic declaration.

class ItemFactory<t> where T : new()<br />
{<br />
public T GetNewItem()<br />
{<br />
    return new T();<br />
}<br />
}</t>

typeof :
Used to obtain the System.Type object for a type. A typeof expression takes the following form:
System.Type type = typeof(int);

You could have find more info on MSDN. :)

-KR

Difference between new & passing Type of the object

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