初次提交

Script/Item/BagItem.cs

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+using Godot;
+using System;
+using System.Collections.Generic;
+
+public partial class BagItem
+{
+    public ItemResource itemResource;
+    public int amount;
+
+    public string ItemName
+    {
+        get
+        {
+            return itemResource?.ItemName ?? "Unknown"; // 防止空引用
+        }
+    }
+
+    public string Description
+    {
+        get
+        {
+            return itemResource?.Description ?? "No description"; // 防止空引用
+        }
+    }
+
+    public void AddAmount(int value)
+    {
+        if (value < 0)
+        {
+            GD.PrintErr("Cannot add negative amount to BagItem.");
+            return;
+        }
+        amount += value;
+    }
+
+    public void RemoveAmount(int value)
+    {
+        if (value < 0 || value > amount)
+        {
+            GD.PrintErr("Invalid amount to remove from BagItem.");
+            return;
+        }
+        amount -= value;
+    }
+}