异常！System.NullReferenceException: 未将对象引用设置到对象的实例


//========================= ItemDTO 定义 
public class ItemDTO
{
public int id;
public int itemId;
public int itemNum;
public string outTime;
public int roleId;
public int storageType;
}
//========================= GardenSeed 定义 
public class GardenSeed : ObjBase
{
public int SeedTime
{
get
{
return Convert.ToInt32(base.Columns["SeedTime"].Value);
}
set
{
base.Columns["SeedTime"].Value = value;
}
}
public string SeedGetMoney
{
get
{
return Convert.ToString(base.Columns["SeedGetMoney"].Value);
}
set
{
base.Columns["SeedGetMoney"].Value = value;
}
}
public int ID
{
get
{
return Convert.ToInt32(base.Columns["ID"].Value);
}
set
{
base.Columns["ID"].Value = value;
}
}
public int SeedID
{
get
{
return Convert.ToInt32(base.Columns["SeedID"].Value);
}
set
{
base.Columns["SeedID"].Value = value;
}
}
public GardenSeed()
{
base.TableName = "GardenSeed";
base.AddColumn(new Column("SeedTime", ColumnType.Int));
base.AddColumn(new Column("SeedGetMoney", ColumnType.String));
base.AddColumn(new Column("ID", "0", ColumnType.Int, true, IdentityType.Normal));
base.AddColumn(new Column("SeedID", ColumnType.Int));
}
}
//=========================  出错地方
public class PackagMgr : BaseMgr
    {
        public static List<ItemDTO> CURRENT_PACAGE = new List<ItemDTO>();
        private MyGM myGM_0 = GM.CreateNewGM();
        private ResourceMgr resourceMgr_0 = new ResourceMgr();
        public void Test()
        {
            ResourceMgr resourceMgr = new ResourceMgr();
            foreach (ItemDTO current in PackagMgr.CURRENT_PACAGE)
            {
                Console.WriteLine(string.Concat(new object[]
                {
                    current.itemId,
                    ":",
                    resourceMgr.GetItemByItemID(current.itemId).MyName,
                    ":",
                    current.itemNum,
                    " st:",
                    current.storageType
                }));
            }
        }        public ItemDTO method_0(int id)
        {
            ItemDTO result;                for (int i = 0; i < PackagMgr.CURRENT_PACAGE.Count; i++)//出错
                {                    if (PackagMgr.CURRENT_PACAGE[i].id == id)
                    {
                        result = PackagMgr.CURRENT_PACAGE[i];
                        return result;
                    }
                }            result = null;
            return result;
        }        public ItemDTO GetItemByItemID(int id)
        {
            ItemDTO result;
            for (int i = 0; i < PackagMgr.CURRENT_PACAGE.Count; i++)//出错
            {                    if (PackagMgr.CURRENT_PACAGE[i].itemId == id)
                    {
                        result = PackagMgr.CURRENT_PACAGE[i];
                        return result;
                    }            }
            result = null;
            return result;
}
//=================调用
foreach (EquipDTO current in DataCenter.CURRENT_EQUIPS)
{
string[] array = new string[4];
ItemDTO itemDTO = packagMgr.method_0(current.id);//调用method_0
if (itemDTO != null)
{
Item itemByItemID = resourceMgr.GetItemByItemID(itemDTO.itemId);
//调用GetItemByItemID
if (itemByItemID != null)
{ array[0] = itemByItemID.MyName; }
       }//------调用
private void method_15()
{
this.util_0.ClearLV(this.lv_seed);
ResourceMgr resourceMgr = new ResourceMgr();
List<GardenSeed> gardenSeed = resourceMgr.GetGardenSeed();
if (gardenSeed != null && gardenSeed.Count != 0)
{
List<string[]> list = new List<string[]>();
PackagMgr packagMgr = new PackagMgr();
   foreach (GardenSeed current in gardenSeed)
{
                    string[] array = new string[4];
                    array[0] = resourceMgr.GetItemNameByItemID(current.SeedID);
                    array[1] = current.SeedTime.ToString() + "天";
                    array[2] = "0";                  ItemDTO itemByItemID = packagMgr.GetItemByItemID(current.SeedID);
                  //调用GetItemByItemID 
                    if (itemByItemID != null)
                    {
                        array[2] = itemByItemID.itemNum.ToString();
                    }
                    array[3] = current.SeedID.ToString();
                    list.Add(array);[]未处理异常！System.NullReferenceException: 未将对象引用设置到对象的实例。
   在 Manager.PackagMgr.GetItemByItemID(Int32 id) 位置 E:\工程\PackagMgr.cs:行号 60
百度好久  发现出现这个问题都是 未初始化 和 NULL值
public static List<ItemDTO> CURRENT_PACAGE后面加上了new List<ItemDTO>();
还是不行
不知道怎么弄啊  求各位大哥帮帮忙异常