2011-03-29 159 views
0

嘿家伙我有一个工作LINQ2SQL系统与类型表,但现在,我已经尝试添加2类之间的继承映射,我得到一个错误创建一个DataContext的实例。错误是“以不正确的格式输入字符串”。我猜测在我的Datacontext类中输入Tables以及映射到位后会发生一些冲突。LINQ TO SQL继承与DataContext中的类型表映射的继承映射

继承人我的代码

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 
{ 
} 

我还要说一个缩短版,CronJobs类有一些映射属性(其实际上只在子类中的SQL表中,我假定这是确定。 (IE我只是想声明的超一个为所有子cron作业,这些属性将分享(我将永远不会实例化超类)是现在抛出errror

代码:

DataAccessHelper db = new DataAccessHelper(ConfigurationManager.ConnectionStrings["DataDB"].ConnectionString); 

堆栈跟踪:

FormatException: Input string was not in a correct format. 

System.Number.StringToNumber(字符串str的NumberStyles选项,NumberBuffer &数的NumberFormatInfo信息,布尔parseDecimal)9594283 System.Number.ParseInt32(字符串s的NumberStyles风格,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,类型类型)+3236 System.Data.Linq.Mapping.AttributedRootType..ctor(AttributedMetaModel model,Attribu tedMetaTable表,Type类型)+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(对象连接,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 ,布尔includeStagesAfterAsyncPoint)+2207

回答

0

我认为这是beco继承性映射代码和鉴别器列ID之间的类型不匹配z是字符串,另一个是int