Casting GraphNode to GridNode

General Grid graph
#1

Hello, I’m using SingleNodeBlocker for my project and lastBlocked property return GraphNode to me. I’m using GridGraph and I want to use GraphNode as GridNode.
Casting like (GridNode)singleNodeBlocker.lastBlocked return me error:

“InvalidCastException: Specified cast is not valid.”

How can I cast GrahpNode to GridNode?

#2

Hi

You have to use the as operator. node as GridNode.

#3

AFAIK ‘as’ operator is only safe version of casting. It returns null when casting is not successful.

In my code, I know lastBlocked property is not null and give me true values. But when I cast it to GridNode, it returns null.

if (currentSingleNodeBlocker.lastBlocked != null)
                {
//Entering here successfully
                    Debug.Log($"Single Node Blocker is not empty");
                    Debug.Log($"Single Node Blocker Position: {currentSingleNodeBlocker.lastBlocked.position}");
                    Debug.Log($"Single Node Blocker Graph Index: {currentSingleNodeBlocker.lastBlocked.GraphIndex}");
                    Debug.Log($"Single Node Blocker Node Index: {currentSingleNodeBlocker.lastBlocked.NodeIndex}");

                    var test = currentSingleNodeBlocker.lastBlocked as GridNode;
                    if (test != null)
                    {
//Not entering here
                    }
                    else
                    {
                        Debug.Log($"Casting is empty");
                    }

                    if ((currentSingleNodeBlocker.lastBlocked as GridNode) != null)
                    {
//Not entering here
                    }
                    else
                    {
                        Debug.Log($"Casting is empty");
                    }
                }
                else
                {
                    Debug.Log($"Last Blocked is empty.");
                }
            }
#4

Are you sure it is a grid node then? Try logging node.GetType().Name

#5

Yes. I’m sure. GetType().Name returning “GridNode”. I double check it again. It’s very strange.

#6

any update about it? I think it’s a kind of bug. Should I investigate more for helping?

#7

Hi

If node.GetType() returns GridNode then a cast to GridNode should not possibly be able to fail. That’s part of the C# language. I would advise you to investigate a bit more.