最初是为了把Cookie 保存到本地,然后随时加载这个Cookie免登陆的
后来把它改了泛型,可以保存所有有 Serializable 的类对象
public static bool WriteObjToDisk<T>(string file, T obj) where T:class
        {
            //file = file.Replace(":", ":");
            if (file == "") return false;
            using (System.IO.Stream stream = System.IO.File.Create(file))
            {
                try
                {
                    //Console.Out.Write("Writing cookies to disk... ");
                    System.Runtime.Serialization.Formatters.Binary.BinaryFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                    formatter.Serialize(stream, obj);
                    //Console.Out.WriteLine("Done.");
                    return true;
                }
                catch (Exception e)
                {
                    // Console.Out.WriteLine("Problem writing cookies to disk: " + e.GetType());
                }
            }
            return false;
        }
        public static T ReadObjFromDisk<T>(string file) where T : class
        {
            // file = file.Replace(":", ":");
            try
            {
                using (System.IO.Stream stream = System.IO.File.Open(file, System.IO.FileMode.Open))
                {
                    // Console.Out.Write("Reading cookies from disk... ");
                    System.Runtime.Serialization.Formatters.Binary.BinaryFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                    // Console.Out.WriteLine("Done.");
                    return (T)formatter.Deserialize(stream);
                }
            }
            catch (Exception e)
            {
                 
                return null;
            }
        }
原文:http://www.cnblogs.com/zhshlimi/p/4997283.html