struct field's property inside a class, cannot access class's fields

Question

2.00/5 (1 vote)

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Hello everyone, can you please help me in finding the solution.

Situation:
There is a form (MyForm), and a user control class (MyShape),
there will be multiple objects of MyShape inside MyForm. Now each object need to know some info about some other object. As the info has many fields and its common to all the objects, i thought it would be better to bind the info in a struct (or a class ???). I need to make the fields of this struct as property, so that i can read the latest data.

problem:
MyShape's fields are not accessible inside struct's fields's property.

Help required :
Is there a way to access MyShape's fields inside struct's fields's ?
Is using class rather than struct be better ?
Is there another way to perform such task ?

Code:
A sample code for better understanding of my requirement is as below:
(* THIS CODE IS NOT CORRECT, ITS JUST A REPRESENTATION OF MY REQUIREMENT)

public class MyShape
{
	private int num;
	private int size;
	public struct Info
	{
		int Num{ get { return num;} set{ num = value;}} // Error
		int Size{ set { size = value;} set{ size = value;}} // Error		
...
	};

	public static Info info;

	public MyShape(int num, int size)
	{
		this.num = num;
		this.size = size;
	}
}

public class MyForm : form
{
	private void SomeFunc()
	{
		MyShape shapeA = new MyShape(1,2);
		MyShape shapeB = new MyShape(3,4);

		shapeA.info = shapeB.info;
	}
}

Posted 27-Sep-10 12:16pm

Abhishrek

Updated 27-Sep-10 15:15pm

v3

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3 solutions

Solution 1

What is your objection to making them plain old properties?

C#

public class MyShape
{
    private int num;
    private int size;

    public MyShape(int num)
    {
        this.num = num;
    }

    public int Num
    {
        get
        {
             return this.num;
        }

        set
        {
            this.num = value;
        }
    }

    // and so on
}

Posted 27-Sep-10 12:40pm

Henry Minute

Comments

Abhishrek 27-Sep-10 21:09pm

As i wrote in the question, there will be many class fields which i need to simply copy from one object to another object. I can ofcourse do it one by one if the fields use property. However it would be much simpler to simply copy one struct to another !!! Thus i was looking for struct approach.

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Abhishek Sur · Accepted Answer · 2010-09-27T12:41:00

Hey Abhshake,

Basically we create struct /class to create objects.
Class / struct holds the definition of an object so that when an object is created it will hold reference of each of its members.

Now Nesting a class or struct does not mean that the properties from outside will be accessible. One thing which you might do is

public class MyShape
{
   public struct MyNestedStruct
   {
      public MyShape ParentObject {get;set;}
      public MyNestedStruct(MyShape sobj)
      {
          this.MyShape = sobj; 
      }
   } 

   public MyNestedStruct MyStruct = new MyNestedStruct(this);

}

Now from the nested struct you can access the object of MyShape.
Actually you can only access the properties from within a class by its object. You cannot access a property without an object.

So in your case, rather than creating a Struct it is better to expose properties as Member of the class, or if you wish you can send the object this to the struct to get reference to the parentobject.
:rose:

Henry Minute · Accepted Answer · 2010-09-28T01:56:00

Another possibility if you do not favour Abishek's solution is to declare your struct outside of any class and then have either a Method or Property in your class that returns an instance of the struct.
Something like this:

C#

public struct UsefulStruct
{
  public int number;
  public string name;

  public UsefulStruct(int number, string name)
  {
    this.number = number;
    this.name = name;
  }
}

public class YourClass
{
  int number;
  string name;

  // using a method
  public UseFulStruct GetUsefulInfo()
  {
    return new UsefulStruct(this.number, this.name);
  }

  // using a property
  public UsefulStruct UsefulInfo
  {
    get
    {
      return new UsefulStruct(this.number, this.name);
    }
  }
}

Good luck. :)

struct field's property inside a class, cannot access class's fields

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