How to get properties from another class?

Question

I have a struct (structA) where I want to have a property that holds properties for another class (ClassB).

struct structA
{
public ClassB PropertyA {get; set;}
}

class ClassB
{
int PropertyB1....
int PropertyB2....
int PropertyB3....
}

I want to do this in another class (ClassC)

structA.PropertyA.ClassB = 10

But I always get "Object reference not set to an instance of an object."

Any ideas?

Thanks.

Jason

Vulpes · Answer

You need to create an object of type ClassB and then assign it to structA.PropertyA. You can then access ClassB's properties like this: using System; struct StructA { public ClassB PropertyA {get; set;} } class ClassB { public int PropertyB1 {get; set;} public int PropertyB2 {get; set;} public int PropertyB3 {get; set;} } class Test { static void Main() { StructA structA = new StructA(); structA.PropertyA = new ClassB(); structA.PropertyA.PropertyB1 = 10; Console.WriteLine(structA.PropertyA.PropertyB1); // 10 Console.WriteLine(structA.PropertyA.PropertyB2); // 0 default value Console.WriteLine(structA.PropertyA.PropertyB3); // 0 default value Console.ReadKey(); } }