Setting Object by type C#

Question

What i need to do is something like this, but really can't understand how.

 Object value = new typeof(i.FieldType.GetType());

The type of the value can be whatever, it just must be inherit of a class (for example, BaseClass). The type will be read from (.Net) System.Reflections. But i don't know how can i create a new object of this.

How can i create a new() object (constructor), of an object stored as Object, of which the type if known by the System.Reflections?

It sounds to me like you need a Factory method. See en.wikipedia.org/wiki/Factory_method_pattern — Robert Harvey
– Robert Harvey, Commented Jul 12, 2015 at 15:25
I guess this might help : stackoverflow.com/questions/6472980/… ? — Igoris
– Igoris, Commented Jul 12, 2015 at 15:27
Unless you're writing something specialistic, a generic application doesn't need reflection. Using base classes, interfaces and perhaps a factory as suggested by @Robert you should be fine. Explain how you would use this code later. — CodeCaster
– CodeCaster, Commented Jul 12, 2015 at 15:27
BaseClass value = (BaseClass)Activator.CreateInstance(typeof(t)) — Olivier Jacot-Descombes
– Olivier Jacot-Descombes, Commented Jul 12, 2015 at 15:31
@OlivierJacot-Descombes That will only work if he doesn't want access to the inherited class's members. — Robert Harvey
– Robert Harvey, Commented Jul 12, 2015 at 15:34

fatih kiymet · Accepted Answer · 2015-07-12 15:32:54Z

1

You can use ConstructorInfo class

 var constructorInfo = typeof(myclasstype).GetConstructor();
 if (constructorInfo != null)
 {
     var myclass = constructorInfo.Invoke();
 }

edited Jul 12, 2015 at 15:32

answered Jul 12, 2015 at 15:31

fatih kiymet

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1 Comment

Robert Harvey Over a year ago

That's probably the hard way to do it. See Oliver's comment below the question.

Olivier Jacot-Descombes · Accepted Answer · 2015-07-12 17:41:57Z

1

Do you really need to construct the type at all? If you want to convert a string to a type dynamically (according to one of your comments), then all you need is the System.Convert.ChangeType method.

object convertedValue = Convert.ChangeType(stringValue, i.FieldType.GetType());

Where the second argument to ChangeType is a System.Type.

The Activator is really only needed, if you want to create new (empty) objects dynamically. If the field types you are talking about are standard types like string, int, or bool, then Convert.ChangeType will do it.

edited Jul 12, 2015 at 17:41

answered Jul 12, 2015 at 15:49

Olivier Jacot-Descombes

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Comments

Zotta · Accepted Answer · 2015-07-12 15:57:05Z

0

You are searching for Activator.CreateInstance(Type type)

answered Jul 12, 2015 at 15:57

Zotta

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