unity 读取文本与写入文本

 public ArrayList loadfile(string filePath)
    {
        StreamReader sr = null;
        try
        {
            sr = File.OpenText(filePath);
        }
        catch { }

        string line;
        ArrayList content = new ArrayList();
        while ((line = sr.ReadLine()) != null)
        {
            content.Add(line);
        }

        sr.Close();
        sr.Dispose();
        return content;
    }

    public void writeData(string content, string filePath)
    {
        StreamWriter streamWriter;
        FileInfo fi = new FileInfo(filePath);
        if (!fi.Exists)
            streamWriter = fi.CreateText();
        else
            streamWriter = fi.AppendText();

        streamWriter.WriteLine(content);
        streamWriter.Close();
        streamWriter.Dispose();
    }