In my game, I have a Computer class with following variables:
[System.Serializable]
public class Computer : MonoBehaviour, ShopItem{
public string model;
public int price;
public int speed;
public int watt;
public Sprite image;
}
And I have a script that contains a list of Computer:
List computerList;
Then when I save the game, I pass all data to the DataClass and convert it to Json:
public string SaveToJson(){
//Create data class
DataClass dataClass = new DataClass(...other parameters..., computerList);
//Convert to json
string jsonString = JsonUtility.ToJson(dataClass, false);
//Save to PlayerPref
PlayerPrefs.SetString("GameData", jsonString);
}
I also stored it into a json file just to see the format. The computerList contains some instanceID like below.
"computerList": [
{
"instanceID": 655388
},
{
"instanceID": 654696
},
{
"instanceID": 655502
},
{
"instanceID": 654696
}
],
When load game,I load the playerPref and convert it back to dataClass:
public void LoadGame(){
string result = PlayerPrefs.GetString("GameData");
DataClass dataClass = JsonUtility.FromJson(result);
this.computerList = dataClass.computerList;
}
But when I try to access the computerList, it gives me this error: **ArgumentNullException: Argument cannot be null.**
I am not sure what went wrong, does anyone have any idea? Is it related to the non-persistent instance id? Any help would be appreciated.
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I also saved it in the localhost database, and when I load it back it gives the same error, so I guess it's nothing wrong about PlayerPrefs. Other variables like int, float, list does well, so the problem should be about custom classes.
The full error code is:
ArgumentNullException: Argument cannot be null.
Parameter name: key
System.Collections.Generic.Dictionary`2[ShopItem,System.Int32].ContainsKey (ShopItem key) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:280)
InventoryManager.ProcessItemList () (at Assets/Script/CoreGame/Local Manager/InventoryManager.cs:54)
InventoryManager.ShowInvnetory () (at Assets/Script/CoreGame/Local Manager/InventoryManager.cs:89)
UnityEngine.Events.InvokableCall.Invoke () (at C:/buildslave/unity/build/Runtime/Export/UnityEvent.cs:166)
UnityEngine.Events.UnityEvent.Invoke () (at C:/buildslave/unity/build/Runtime/Export/UnityEvent_0.cs:58)
UnityEngine.UI.Button.Press () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:66)
UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:108)
UnityEngine.EventSystems.ExecuteEvents.Execute (IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:50)
UnityEngine.EventSystems.ExecuteEvents.Execute[IPointerClickHandler] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.EventFunction`1 functor) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:261)
UnityEngine.EventSystems.EventSystem:Update()
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