Need Help with Dictionary

Hey, I don't know how to solve this problem (first time using dictionary) best way would be using for loop I guess, but idk how it works with dictionaries

Code (CSharp):

1.  
2. public Dictionary<Item, int> itemsInInventory = new Dictionary<Item, int>();
3.  
4. public void AddResource(Dictionary<Item, int> itemsToAdd)
5.     {
6.         foreach (KeyValuePair<Item, int> itemToAdd in itemsToAdd)
7.         {
8.  
9.             if (itemsInInventory.Count == 0)
10.             {
11.                 itemsInInventory.Add(itemToAdd.Key, itemToAdd.Value);
12.             }
13.             else
14.             {
15.                 if (!itemsInInventory.Keys.Equals(itemToAdd.Key))
16.                 {
17.                     itemsInInventory.Add(itemToAdd.Key, itemToAdd.Value);
18.                 }
19.                 else
20.                 {
21.                     // I NEED TO ADD "itemToAdd.value" TO CERTAIN POSITION IN "itemsInInventory"
22.                     foreach (Item inventoryItem in itemsInInventory.Keys)
23.                     {
24.                         if (inventoryItem.Equals(itemToAdd.Key))
25.                         {
26.                             itemsInInventory[inventoryItem] += itemToAdd.Value;
27.                         }
28.                     }
29.                 }
30.             }
31.                    

 

You are wildly overcomplicating this. Just check if it exists or not and add the existing value if it does.

Code (CSharp):

1. public void AddResource(Dictionary<Item, int> itemsToAdd) {
2.    foreach (KeyValuePair<Item, int> toAdd in itemsToAdd) {
3.       int existingValue = 0;
4.       // if it exists, use the existing value. Otherwise leave it at 0
5.       if (itemsInInventory.ContainsKey(toAdd.Key)) {
6.          existingValue = itemsInInventory[toAdd.Key];
7.       }
8.  
9.       // add the new value
10.       existingValue += toAdd.Value;
11.       // write back to the inventory
12.       itemsInInventory[toAdd.Key] = existingValue;
13.    }
14. }

And here's a slightly more advanced and concise version using TryGetValue:

Code (CSharp):

1. public void AddResource(Dictionary<Item, int> itemsToAdd) {
2.    foreach (KeyValuePair<Item, int> toAdd in itemsToAdd) {
3.       // grab the existing value or 0 from the inventory.
4.       itemsInInventory.TryGetValue(toAdd.key, out int existingValue)
5.       // add the new value
6.       existingValue += toAdd.Value;
7.       // write back to the inventory
8.       itemsInInventory[toAdd.Key] = existingValue;
9.    }
10. }

 

Perfect, thank you so much!