菜鸟的简单问题：序列化问题，这段代码的含义。

protected GraphicsList(SerializationInfo info, StreamingContext context)

        {

            graphicsList = new DrawList();

  

            int n = info.GetInt32(entryCount);

            string typeName;

            DrawObject drawObject;

  

            for (int i = 0; i < n; i++)

            {

                typeName = info.GetString(String.Format(CultureInfo.InvariantCulture,"{0}{1}",entryType, i));

  

                drawObject = (DrawObject)Assembly.GetExecutingAssembly().CreateInstance(

                    typeName);

  

                drawObject.LoadFromStream(info, i);

  

                graphicsList.Add(drawObject);

            }

  

        }

为什么要info.GetInt32()? 
------解决方案--------------------
从 SerializationInfo 存储区中检索一个 32 位有符号整数值。
http://msdn.microsoft.com/zh-cn/library/2t208w9f(v=vs.80).aspx
------解决方案--------------------
http://www.codeproject.com/Articles/8494/DrawTools