CODEWITHSUNDEEP
c#.netoopgenerics
Sandy
Sandy

Reputation: 11687

Create object generics class

I came across a question recently and I have not worked much on that in my past. I have a class named ObjectCreator with a method Create.

public static class ObjectCreator
{
    // Create method
}

I should be able to call the Create method in the following ways.

var obj1 = ObjectCreator.Create<Employee>();
var obj2 = ObjectCreator.Create<Client>();
var obj3 = ObjectCreator.Create<Company>();

and so on for any other type. Now how to implement the Create method here? Remember Create method does not accept any parameters here. Can anyone help me to get a work around?

Upvotes: 1

Views: 101

Answers (2)

dcastro
dcastro

Reputation: 68660

public static class ObjectCreator
{
    public static T Create<T>() where T : new()
    {
        return new T();
    }
}

I added the T: new() constraint (which forces the type T to have the default constructor) and the return statement just to illustrate one possible use case.

Upvotes: 4

Mehmet Ataş
Mehmet Ataş

Reputation: 11549

We already have Activator.CreateInstance Method which requires (not forces) a parameterless public constructor. If no suitable constructor found it throws an exception at runtime. Since dcastor's answer forces a compile time error it seems better.

var obj1 = Activator.CreateInstance<Employee>();
var obj2 = Activator.CreateInstance<Client>();
var obj3 = Activator.CreateInstance<Company>();

Upvotes: 2

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