如何在 EF 业务对象中包含 [NotMapped] 属性 而不会出现 FirstChance IndexOutofRangeException?
How do I include a [NotMapped] property in an EF business object without getting FirstChance IndexOutofRangeException?
我想知道为什么我的 XAF WinForms EF 应用程序加载详细视图时速度很慢。
然后我学习了如何捕获 FirstChance 异常并发现我遇到了
中描述的 IndexOutOfRange 异常
有时我想在我的业务对象中包含一个非映射 属性,例如示例中的 Job。
public class OrderLineResult
{
public int LineId { get; set; }
public int Quantity { get; set; }
public string Description { get; set; }
[Browsable(false)] public int JobId { get; set; }
[NotMapped] [Browsable(false)] public virtual Job Job { get; set; }
}
我有一个方法可以获取 OrderLineResult 中的数据 class
public static OrderLineResult[] GetData(int headId)
{
using var connect = new MyDbContext()
const string sql =
@"SET NOCOUNT ON;
create table #temp( JobId int, Quantity int, LineId int, Description )
/* code to populate the table */
select JobId,LineId,Quantity, Description from #temp"
var results = connect.Database.SqlQuery<OrderLineResult>(sql,headId).ToArray();
return results.ToArray();
}
}
然而作业 属性.
出现 IndexOutOfRange 异常
调用堆栈为
System.IndexOutOfRangeException
Job
at MyApp.Module.Win.Controllers.ToDoList.TaskActionController.<>c.<actExceptions_Execute>b__34_0(Object sender, FirstChanceExceptionEventArgs e)
at System.Data.ProviderBase.FieldNameLookup.GetOrdinal(String fieldName)
at System.Data.SqlClient.SqlDataReader.GetOrdinal(String name)
at System.Data.Entity.Core.Query.InternalTrees.ColumnMapFactory.TryGetColumnOrdinalFromReader(DbDataReader storeDataReader, String columnName, Int32& ordinal)
at System.Data.Entity.Core.Query.InternalTrees.ColumnMapFactory.CreateColumnMapFromReaderAndClrType(DbDataReader reader, Type type, MetadataWorkspace workspace)
at System.Data.Entity.Core.Objects.ObjectContext.InternalTranslate[TElement](DbDataReader reader, String entitySetName, MergeOption mergeOption, Boolean streaming, EntitySet& entitySet, TypeUsage& edmType)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQueryInternal[TElement](String commandText, String entitySetName, ExecutionOptions executionOptions, Object[] parameters)
at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass186_0`1.<ExecuteStoreQueryReliably>b__1()
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass186_0`1.<ExecuteStoreQueryReliably>b__0()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQueryReliably[TElement](String commandText, String entitySetName, ExecutionOptions executionOptions, Object[] parameters)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQuery[TElement](String commandText, ExecutionOptions executionOptions, Object[] parameters)
at System.Data.Entity.Internal.LazyEnumerator`1.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at MyApp.Module.BusinessObjects.NonPersistedBusinessObjects.OrderLineResult.GetData(Int32 headId)
我正在使用 EntityFramework 6.4.4 和 .Net Framework 4.7.2
这感觉像是一个障碍,
我加了
,null as job
到最后一个 select 语句
我想知道为什么我的 XAF WinForms EF 应用程序加载详细视图时速度很慢。
然后我学习了如何捕获 FirstChance 异常并发现我遇到了
有时我想在我的业务对象中包含一个非映射 属性,例如示例中的 Job。
public class OrderLineResult
{
public int LineId { get; set; }
public int Quantity { get; set; }
public string Description { get; set; }
[Browsable(false)] public int JobId { get; set; }
[NotMapped] [Browsable(false)] public virtual Job Job { get; set; }
}
我有一个方法可以获取 OrderLineResult 中的数据 class
public static OrderLineResult[] GetData(int headId)
{
using var connect = new MyDbContext()
const string sql =
@"SET NOCOUNT ON;
create table #temp( JobId int, Quantity int, LineId int, Description )
/* code to populate the table */
select JobId,LineId,Quantity, Description from #temp"
var results = connect.Database.SqlQuery<OrderLineResult>(sql,headId).ToArray();
return results.ToArray();
}
}
然而作业 属性.
出现 IndexOutOfRange 异常调用堆栈为
System.IndexOutOfRangeException
Job
at MyApp.Module.Win.Controllers.ToDoList.TaskActionController.<>c.<actExceptions_Execute>b__34_0(Object sender, FirstChanceExceptionEventArgs e)
at System.Data.ProviderBase.FieldNameLookup.GetOrdinal(String fieldName)
at System.Data.SqlClient.SqlDataReader.GetOrdinal(String name)
at System.Data.Entity.Core.Query.InternalTrees.ColumnMapFactory.TryGetColumnOrdinalFromReader(DbDataReader storeDataReader, String columnName, Int32& ordinal)
at System.Data.Entity.Core.Query.InternalTrees.ColumnMapFactory.CreateColumnMapFromReaderAndClrType(DbDataReader reader, Type type, MetadataWorkspace workspace)
at System.Data.Entity.Core.Objects.ObjectContext.InternalTranslate[TElement](DbDataReader reader, String entitySetName, MergeOption mergeOption, Boolean streaming, EntitySet& entitySet, TypeUsage& edmType)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQueryInternal[TElement](String commandText, String entitySetName, ExecutionOptions executionOptions, Object[] parameters)
at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass186_0`1.<ExecuteStoreQueryReliably>b__1()
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass186_0`1.<ExecuteStoreQueryReliably>b__0()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQueryReliably[TElement](String commandText, String entitySetName, ExecutionOptions executionOptions, Object[] parameters)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQuery[TElement](String commandText, ExecutionOptions executionOptions, Object[] parameters)
at System.Data.Entity.Internal.LazyEnumerator`1.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at MyApp.Module.BusinessObjects.NonPersistedBusinessObjects.OrderLineResult.GetData(Int32 headId)
我正在使用 EntityFramework 6.4.4 和 .Net Framework 4.7.2
这感觉像是一个障碍, 我加了
,null as job
到最后一个 select 语句