Question

I have the following problem. This is a simple example of some classes I have (each have dependencies on other classes).

public Class1()
{
  public Class1(Class2 class2)
 {

 }
}

public Class2()
{
  public Class2(Class3 class3)
 {

 }
}

public Class3()
{
 public Class1 class1;
 public Class3(Class1 class1)
 {
     this.class1 = class1;
 }
}

I then have the following code initialising the objects.

Class1 class1 = null;
Class2 class2 = null;
Class3 class3 = null;

class3 = new Class3(class1);
class2 = new Class2(class3);
class1 = new Class1(class2);

Assert.IsNotNull(class3.class1)

The problem I have is that the assert is always null, even though class1 has been initalized. One condition I do have is that I only want there to be one instance of each class created.

Can anybody advise the best way to make sure the assert passes.

Answer 1

class1 is not initialized to its object when class3 is created, thus class3’s instance of it is null.

The proper way to make this test pass is:

Class1 class1 = null;
Class2 class2 = null;
Class3 class3 = null;

class1 = new Class1();
class3 = new Class3(class1);
class2 = new Class2(class3);
class1.Class3 = class3;

Assert.IsNotNull(class3.class1)