Updated Delete and Appends methods on linked list

C#/Datastructures/LinkedList.cs

@@ -61,6 +61,7 @@ namespace C_.Datastructures
         }
 
         public void Append(T value){
+            //Create new node
             LinkedListNode<T> newItem = LinkedListNode<T>.Create(value, default);
             Count++;
 
@@ -79,42 +80,46 @@ namespace C_.Datastructures
             }
 
             //Append item to end
-            end!.Next = new LinkedListNode<T>{
+            end!.Next = newItem;
-                Value = value,
+
-                Next = default
-            };
         }
 
         public void Insert(int index, T value)
         {
             if (index > Count) throw new System.Exception("Error! Index outside of Bounds");
 
+            Count++;
+
+            //Set head to new item if list is empty
+            if (index == 0 || Head == null)
+            {
+                Head = LinkedListNode<T>.Create(value, Head);
+                return;
+            }
+
             //Fetch point in list at which item will be added
             LinkedListNode<T>? node = Traverse(index - 1);
 
-            node!.Next = new LinkedListNode<T> { 
+            node!.Next = LinkedListNode<T>.Create(value, node!.Next);
-                Value = value, 
-                Next = node.Next 
-            };
-            Count++;
         }
 
         public void Delete(int index)
         {
+            if (index > Count) throw new System.Exception("Error! Index outside of Bounds");
+
+            Count--;
+
             //Check if we are trying to reference the first item
             if (index == 0 && Head != null)
             {
-                Head = (LinkedListNode<T>?)Head!.Next;
+                Head = Head!.Next;
                 return;
             }
 
-            //Find node we are trying to delete and then remove / relink
+            //Find node before the one we are trying to delete and then remove / relink
             LinkedListNode<T>? node = Traverse(index - 1);
 
-            if (node == null || node.Next == null) throw new System.Exception("Error! Index outside of Bounds");
+            node!.Next = node.Next!.Next;
-
-            node.Next = node.Next.Next;
-            Count--;
         }
 
         private LinkedListNode<T>? Traverse(){

C#/Program.cs

@@ -5,7 +5,37 @@ using C_.Datastructures.Nodes;
 // See https://aka.ms/new-console-template for more information
 Console.WriteLine("Hello, World!");
 
-DoublyLinkedList<int> list = new DoublyLinkedList<int>();
+//DoublyLinkedList<int> list = new DoublyLinkedList<int>();
+
+//list.Append(1);
+//list.Append(2);
+//list.Append(3);
+//list.Append(4);
+//list.Append(5);
+//list.Append(6);
+//list.Append(7);
+//list.Append(8);
+
+//DoublyLinkedList<int> list2 = new DoublyLinkedList<int>();
+
+//list2.Append(1);
+//list2.Append(2);
+//list2.Append(3);
+//list2.Append(4);
+//list2.Append(5);
+//list2.Append(6);
+//list2.Append(7);
+//list2.Append(8);
+
+//list.Insert(9, 5);
+
+//list.Delete(2);
+
+//var x = list[-6];
+
+//Console.WriteLine(x);
+
+LinkedList<int> list = new LinkedList<int>();
 
 list.Append(1);
 list.Append(2);
@@ -13,25 +43,13 @@ list.Append(3);
 list.Append(4);
 list.Append(5);
 list.Append(6);
-list.Append(7);
-list.Append(8);
-
-DoublyLinkedList<int> list2 = new DoublyLinkedList<int>();
-
-list2.Append(1);
-list2.Append(2);
-list2.Append(3);
-list2.Append(4);
-list2.Append(5);
-list2.Append(6);
-list2.Append(7);
-list2.Append(8);
-
-list.Insert(9, 5);
 
+list.Insert(0, 200);
+list.Insert(2, 100);
 list.Delete(2);
+list.Delete(0);
+
+Console.ReadLine();
 
-var x = list[-6];
 
-Console.WriteLine(x);