Question

CircuitBoard vBoard = this; 
// Find the desired circuit shape
CircuitShape vShape = vBoard.GetComponent(vId);

In the above statement the vBoard is throwing null in certain time. Any idea?

Please help.

Thank you in advance….

more code.. this is a public function

class CircuitBoard :Canvas
{
    public void Move(string iBoardId, string iCircuitShapeId, double iXCordinate, double iYCordinate)
        {
          CircuitBoard vBoard = this;

    // secutity check..
          if (null != vBoard)
          {
            string vId = PCBFactory.GetUniqueTag(iCircuitShapeId, vBoard);
            // Find the desired circuit shape
            CircuitShape vShape = vBoard.GetComponent(vId);
            if (vShape != null)
            {
               // do something...
            }
          }
        }
}

Answer 1

Why are you assigning this to something in the first place? Why not just try:

class CircuitBoard :Canvas
{
    public void Move(string iBoardId, string iCircuitShapeId, double iXCordinate, double iYCordinate)
    {
        string vId = PCBFactory.GetUniqueTag(iCircuitShapeId, vBoard);
        CircuitShape vShape = this.GetComponent(vId);
        if (vShape != null)
        {
           // do something...
        }
      }
    }
}

There’s no need to define vBoard at all.