[RESOLVED] Dependency injection - some explanation

[LuckyLuke82]

I'm allways confused about term "dependency injection".

Let's take a look at these two examples:

1.) Constructor injection

public class SomeClass
{
      private readonly Class1 class1;

      public SomeClass(Class1 _class1)
      {
          class1=_class1;
  
         //....
       }

}

2.) initializing instance in constructor

public class SomeClass
{
      private readonly Class1 class1;

      public SomeClass()
      {
          class1= new Class1();
  
         //....
       }

}

Now I'm wondering:

- why is example 1.) considered to be a dependency injection and example 2.) not ?

- what are differencies between them ?

- what are pros/cons of using each?


I'm hoping for a simple answer, since I'm a newbie in WPF. Thanks in advance