我一直在試圖添加到列表添加信息從一個SQL數據庫列表。添加新的信息,以列表時,我得到的錯誤是這樣的:如何在不獲取NULLREFERENCEEXCEPTION的情況下添加到列表中?
「類型‘System.NullReferenceException’發生在StatusScope.dll但在用戶代碼中沒有處理
附加信息的一個例外:未將對象引用設置爲一個對象的實例。「
我該如何解決這個錯誤?
MapLogic.cs
public static List<MapModel.ClientInfo> GetClientsData()
{
SqlConnection Connection = site.Models.Shared.DBConnection.GetConnection();
SqlDataReader Reader = null;
SqlCommand Command = new SqlCommand("SELECT DocInfo.DocID, DocInfo.DocName, DocInfo.DocPic, DocInfo.PatientAcceptance, ClientInfo.ClientName, ClientInfo.AddressLocal, ClientInfo.AddressBroad, ClientInfo.Phone, ClientInfo.Lat, ClientInfo.Long, ClientInfo.ClientID FROM DocInfo INNER JOIN ClientInfo ON DocInfo.ClientID = ClientInfo.ClientID;", Connection);
Reader = Command.ExecuteReader();
var ClientsData = new List<MapModel.ClientInfo> { };
int IDCounter = 0;
bool FirstRun = false;
while (Reader.Read())
{
if (!FirstRun)
{
ClientsData.Add(new MapModel.ClientInfo { Id = IDCounter, ClientID = Reader["ClientID"].ToString(), ClientName = Reader["ClientName"].ToString(), DocPic = Reader["DocPic"].ToString(), PatientAcceptance = Reader["PatientAcceptance"].ToString(), AddressLocal = Reader["AddressLocal"].ToString(), AddressBroad = Reader["AddressLocal"].ToString(), Phone = Reader["Phone"].ToString(), latitude = Reader["Lat"].ToString(), longitude = Reader["Long"].ToString(), DocNames = { } });
FirstRun = true;
}
else
{
for (var x = 0; x < ClientsData.Count; x++)
{
if (ClientsData[x].ClientID == Reader["ClientID"].ToString())
{
ClientsData[x].DocNames.Add("123"); //error occurs here
}
else
{
ClientsData.Add(new MapModel.ClientInfo { Id = IDCounter, ClientID = Reader["ClientID"].ToString(), ClientName = Reader["ClientName"].ToString(), DocPic = Reader["DocPic"].ToString(), PatientAcceptance = Reader["PatientAcceptance"].ToString(), AddressLocal = Reader["AddressLocal"].ToString(), AddressBroad = Reader["AddressLocal"].ToString(), Phone = Reader["Phone"].ToString(), latitude = Reader["Lat"].ToString(), longitude = Reader["Long"].ToString() });
}
}
}
IDCounter++;
}
Connection.Close();
return ClientsData;
}
MapModel.cs
public class ClientInfo
{
public int Id { get; set; }
public string ClientID { get; set; }
public string ClientName { get; set; }
public List<string> DocNames { get; set; }
public string DocPic { get; set; }
public string PatientAcceptance { get; set; }
public string AddressLocal { get; set; }
public string AddressBroad { get; set; }
public string Phone { get; set; }
public string latitude { get; set; }
public string longitude { get; set; }
}
*「DocNames = {}」*這行是可疑的。 – Harrison
更改公開列表 DocNames {get;組; }公開名單? DocNames {get;組; } –