File.Open has 1 argument, yet console insists there isn't

Questions & Answers
1

I have a level unlocking script which uses a .dat file

using UnityEngine;
using System.Collections;
using System;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

public class Persistence : MonoBehaviour {

	public bool Level1;
	public bool Level2;

	void Awake () {
		DontDestroyOnLoad(gameObject);
	}

	public void Save () {
		BinaryFormatter bf = new BinaryFormatter();
		FileStream file = File.Open(Application.persistentDataPath + "/Levelinfo.dat", FileMode.Open);

		sData data = new sData();
		data.Level1 = Level1;
		data.Level2 = Level2;

		bf.Serialize(file, data);
		file.Close();
	}

	public void Load () {
		if(File.Exists(Application.persistentDataPath + "/Levelinfo.dat"))
		{
			BinaryFormatter bf = new BinaryFormatter();
			FileStream file = File.Open(Application.persistentDataPath+"/Levelinfo.dat");
			sData data = (sData)bf.Deserialize(file);
			file.Close();

			Level1 = data.Level1;
			Level2 = data.Level2;
		}
	}
}

[Serializable]
class sData
{
	public bool Level1;
	public bool Level2;
}

In this void:

	public void Load () {
		if(File.Exists(Application.persistentDataPath + "/Levelinfo.dat"))
		{
			BinaryFormatter bf = new BinaryFormatter();
			FileStream file = File.Open(Application.persistentDataPath+"/Levelinfo.dat");
			sData data = (sData)bf.Deserialize(file);
			file.Close();

			Level1 = data.Level1;
			Level2 = data.Level2;
		}
	}
}

In this line:
FileStream file = File.Open(Application.persistentDataPath+“/Levelinfo.dat”);

When I get my mouse over it it says “unknown resolve error”
72891-error.png

Console keeps telling me "No overload for method ‘Open’ takes ‘1’ arguments. Doesn’t it already have 1 argument already?

2

Console keeps telling me "No overload for method ‘Open’ takes ‘1’ arguments. Doesn’t it already have 1 argument already?

That is the problem. It has only one argument, but there is no overload, that takes only one argument. If you look in the documentation, you can see that you need to provide a FileMode. So you want something like

FileStream file = File.Open(Application.persistentDataPath+"/Levelinfo.dat",FileMode.Open); //Or whatever FileMode is fitting for your application