Converting item name to short name?

maybe someone can help me with that
Getting an Item from a players input.
with this here the player has to put in the Shortname....
i dont get it how to change it that the player can input the Displayname "Metal Fragments"

Code:

if (!TryConvert(args[1], out itemname))
                    {
                        
                        return;
                    }
if (displaynameToShortname.ContainsKey(itemname))
             itemname = displaynameToShortname[itemname];
                var definition = ItemManager.FindItemDefinition(itemname);                
                if (definition == null)
                    {
                        SendChatMessage(player, "Item not found");
                        return;
                    }
           
                var item = definition.displayName.english;
               
           
                var item1 = ItemManager.Create(definition, amounts, 0);
                

 

Code:

item.info.shortname
item.info.displayName

Maybe?

 

That does not rly help me.

 

Code:

[ChatCommand("test")]
private void TestCommand(BasePlayer player, string command, string[] args)
{
    string inputitem = string.Join(" ", args);
    ItemDefinition itemdef = ItemManager.FindItemDefinition(inputitem);
    if (itemdef != null)
    {
        SendReply(player, "Found item: " + itemdef.displayName.english, player);
    }
    else
    {
        SendReply(player, "Could not find: " + inputitem, player);
    }
}