Inventory Script. List Contains. I dont know the need bit of code.[UNSOLVED]

I dont know the needed code for the script to check if the Players inventory has a Iron Ingot from line...

  if (PlayerInventory.Inventory.Contains(_worldItemProperties))

_WorldItemProperties is a variable holding the script WorldItemProperties

I thought it would be like this...

  if (PlayerInventory.Inventory.Contains(_worldItemProperties.ItemName ("Iron Ingot")))

I want it to check if the List (Named Inventory) has a Iron Ingot (Iron Ingot is held by a variable named ItemName in the Item class WorldItemProperties which is put into the List.)

When I do that I get...

error CS1955: The member `WorldItemProperties.ItemName' cannot be used as method or delegate

I have NO idea what that even means...I have Googled it, nothing matched my case nor did anything make sense (Thats the internet for me...)

Script with issue

 WorldItemProperties _worldItemProperties;
 void Awake(){
 
 _worldItemProperties = GetComponent<WorldItemProperties>();
 
 }
 public void InventoryWindow(int id)
 {
      if (GUI.Button (new Rect (5, 20, ButtonWidth, ButtonHeight), BronzeBar))
      {
         if (PlayerInventory.Inventory.Contains(_worldItemProperties))
         {
             PlayerInventory.Inventory.Remove (_worldItemProperties);
         }
      }
 }

WorldItemProperties

using UnityEngine; using System.Collections;

[System.Serializable] public class WorldItemProperties : MonoBehaviour {

 public string ItemName = "";
 public Texture2D InvItemTexture;
 public string ItemDescription = "";

}

PlayerInvenotory.Inventory

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class PlayerInventory : MonoBehaviour {
 
     private static List<WorldItemProperties> _inventory = new List<WorldItemProperties>();
     public static List<WorldItemProperties> Inventory {
                 get{ return _inventory;}
         }
 }

I have already asked on forums and they have answered in a way that makes no sense to me and left me to rot... Simple Google search's didn't do any good either.