Need help with object initialization in C#

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class clsCustomer {
public int custid {get; set;}
public clsOrder[] objOrders{get; set;}
}

class clsOrder{
public int OrderId {get; set;}
public int ProductId {get; set;}
public int Quantity {get; set;}
}

Need to assign values to the object of clsCustomer along with order details as below.
clsCustomer objCustomer = new clsCustomer();
objCustomer.custid = 123;
objCustomer.objOrders[0].OrderId = 25255525; (Getting null reference exception at this line.)

What I have tried:

Tried initializing clsOrder inside constructor of clsCustomer but still getting error.

Posted 18-Jul-17 0:13am

Deepak.xip

Updated 18-Jul-17 0:39am

v2

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F-ES Sitecore 18-Jul-17 6:25am

objOrders is an array, so you need to reference an item at an index, like

.objOrders[0].OrderId

you can't do something like

.objOrders.OrderId

as it doesn't know which order you want to set OrderId on

Deepak.xip 18-Jul-17 6:30am

Sorry for the typo @F-ES Sitecore.I am doing the same but still getting error.

2 solutions

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Satya Prakash Swain · Accepted Answer · 2017-07-18T00:39:00

Solution 2

clsCustomer objCustomer = new clsCustomer();
          objCustomer.custid = 123;
          objCustomer.objOrders = new clsOrder[] {new clsOrder() { OrderId = 25255525 } };

Creating

objOrders

with new

clsOrder[]

and assigning

{new clsOrder() { OrderId = 25255525 } }

.

Posted 18-Jul-17 0:39am

Satya Prakash Swain

Updated 18-Jul-17 0:40am

v2

OriginalGriff · Accepted Answer · 2017-07-18T00:32:00

You can't just declare an array property and just use it - it's an "empty link" when the variable is created, because the system has no idea how big the array should be.
Add code to your constructor to create the array and you should be fine:

public class clsCustomer 
   {
   public int custid {get; set;}
   public clsOrder[] objOrders{get; set;}
   public clsCustomer(int arrayNeeded = 10)
      {
      objOrders = new clsOrder[arrayNeeded];
      }
   }