嘿傢伙我有一個工作LINQ2SQL系統與類型表,但現在,我已經嘗試添加2類之間的繼承映射,我得到一個錯誤創建一個DataContext的實例。錯誤是「以不正確的格式輸入字符串」。我猜測在我的Datacontext類中輸入Tables以及映射到位後會發生一些衝突。LINQ TO SQL繼承與DataContext中的類型表映射的繼承映射
繼承人我的代碼
public class DataAccessHelper : DataContext
{
public static DataContext db;
public Table<CronJob> CronJob;
public Table<SongCronJob> SongCronJob;
public DataAccessHelper(string connection) : base(connection) { }
}
[Table(Name = "cron_jobs",)]
[InheritanceMapping(Code = "CJ", Type = typeof(CronJob))]
[InheritanceMapping(Code = "SCJ", Type = typeof(SongCronJob))]
public class CronJob //Instantiated by any cron job run
{
//IsDiscriminator = true,
[Column(IsPrimaryKey = true, IsDiscriminator = true, Name = "id", IsDbGenerated = true, CanBeNull = false)]
public int ID { get; set; }
}
[Table(Name = "cron_jobs_songs")]
public class SongCronJob : CronJob
{
}
我還要說一個縮短版,CronJobs類有一些映射屬性(其實際上只在子類中的SQL表中,我假定這是確定。 (IE我只是想聲明的超一個爲所有子cron作業,這些屬性將分享(我將永遠不會實例化超類)是現在拋出errror
代碼:
DataAccessHelper db = new DataAccessHelper(ConfigurationManager.ConnectionStrings["DataDB"].ConnectionString);
堆棧跟蹤:
FormatException: Input string was not in a correct format.
System.Number.StringToNumber(字符串str的NumberStyles選項,NumberBuffer &數的NumberFormatInfo信息,布爾parseDecimal)9594283 System.Number.ParseInt32(字符串s的NumberStyles風格,的NumberFormatInfo info)+119 System.String.System.IConvertible.ToInt32(IFormatProvider provider)+46 System.Convert.ChangeType(Object value,Type conversionType,IFormatProvider provider)+385 System.Data.Linq.DBConvert.ChangeType(Object值,類型類型)+3236 System.Data.Linq.Mapping.AttributedRootType..ctor(AttributedMetaModel model,Attribu tedMetaTable表,Type類型)+408 System.Data.Linq.Mapping.AttributedMetaTable..ctor(AttributedMetal model,TableAttribute attr,Type rowType)+97 System.Data.Linq.Mapping.AttributedMetaModel.GetTableNoLocks(Type rowType)+ 216 System.Data.Linq.Mapping.AttributedMetaModel.GetTable(Type rowType)+184 System.Data.Linq.DataContext.GetTable(Type type)+51 System.Data.Linq.DataContext.InitTables(Object schema)+ 180 System.Data.Linq.DataContext.Init(對象連接,MappingSource映射)+269 System.Data.Linq.DataContext..ctor(String fileOrServerOrConnection)+44 Helper.Data.DataAccessHelper..ctor(String connection)在C:\ Users \ william \ Desktop \ Stuff \ Important Notables \ Subversion Dev \ Projects \ CodenameDiddy \ helper \ Data \ DataHelper.cs:2 0 CodenameDiddy.masterpages.Cronxxx.Page_Load(Object sender,EventArgs e)in C:\ Users \ william \ Desktop \ Stuff \ Important Notables \ Subversion Dev \ Projects \ CodenameDiddy \ http \ masterpages \ Cronxxx.master.cs:32 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp,Object o,Object t,EventArgs e)+14 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender,EventArgs e)+35 System.Web.UI。 Control.OnLoad(EventArgs e)+91 System.Web.UI.Control.LoadRecursive()+74 System.Web.UI.Control.LoadRecursive()+146 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint ,布爾includeStagesAfterAsyncPoint)+2207