为类实现复制方法

为类实现复制方法。下面方法只是对成员变量，属性实现复制。有空还需要将方法等补上。

private static void CopyObject(object src, object des)
    {
        System.Type objType = src.GetType();

        foreach (PropertyInfo pi in objType.GetProperties())
        {
            object propertySrcValue = pi.GetValue(src, null); 
            object propertyDesValue = pi.GetValue(des, null);

            if (propertySrcValue == null)
            {
                return;
            }

            System.Type piType = propertySrcValue.GetType();

            if (piType.IsValueType || piType == typeof(string))
            {
                object propertyValue = pi.GetValue(src,null);
                pi.SetValue(des, propertyValue, null);
            }
            else if (piType.IsArray)
            {
                Array srcArr = (Array)propertySrcValue;
                System.Type elementType = piType.GetElementType();
                Array desArr = Array.CreateInstance(elementType, srcArr.Length);
                for (int i = 0; i < srcArr.Length; i++)
                {
                    object srcObj = srcArr.GetValue(i);
                    object desObj = System.Activator.CreateInstance(elementType);
                    CopyObject(srcObj, desObj);
                    desArr.SetValue(desObj, i);
                }

                pi.SetValue(des,desArr,null);
            }
            else 
            {
                if (propertyDesValue == null)
                {
                    if (piType.GetConstructors().Length > 0)
                    {
                        propertyDesValue = System.Activator.CreateInstance(piType);
                    }
                }

                CopyObject(propertySrcValue, propertyDesValue);
                pi.SetValue(des, propertyDesValue, null);
            }
        }
   }