在MS LocalDB或SQL2012中执行OrmLiteWriteConnectionExtensions.CreateTable()时，会将其转换为TIME(7) db列类型。因此，使用OrmLiteWriteConnectionExtensions.SaveAll()插入数据时会出现以下错误：
Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidCastException: Failed to convert parameter value from a TimeSpan to a DateTime. ---> System.InvalidCastException: Object must implement IConvertible.
at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)
at System.Data.SqlClient.SqlParameter.CoerceValue(Object value, MetaType destinationType, Boolean& coercedToDataFeed, Boolean& typeChanged, Boolean allowStreaming)
--- End of inner exception stack trace ---
at System.Data.SqlClient.SqlParameter.CoerceValue(Object value, MetaType destinationType, Boolean& coercedToDataFeed, Boolean& typeChanged, Boolean allowStreaming)
at System.Data.SqlClient.SqlParameter.GetCoercedValue()
at System.Data.SqlClient.SqlParameter.Validate(Int32 index, Boolean isCommandProc)
at System.Data.SqlClient.SqlCommand.BuildParamList(TdsParser parser, SqlParameterCollection parameters)
at System.Data.SqlClient.SqlCommand.BuildExecuteSql(CommandBehavior behavior, String commandText, SqlParameterCollection parameters, _SqlRPC& rpc)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at ServiceStack.OrmLite.OrmLiteResultsFilterExtensions.ExecNonQuery(IDbCommand dbCmd)
at ServiceStack.OrmLite.OrmLiteWriteExtensions.Insert[T](IDbCommand dbCmd, T obj, Boolean selectIdentity)
at ServiceStack.OrmLite.OrmLiteWriteExtensions.SaveAll[T](IDbCommand dbCmd, IEnumerable`1 objs)
at ServiceStack.OrmLite.OrmLiteWriteConnectionExtensions.<>c__DisplayClass5d`1.<SaveAll>b__5c(IDbCommand dbCmd)
at ServiceStack.OrmLite.ReadConnectionExtensions.Exec[T](IDbConnection dbConn, Func`2 filter)
at ServiceStack.OrmLite.OrmLiteWriteConnectionExtensions.SaveAll[T](IDbConnection dbConn, IEnumerable`1 objs)
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
虽然我很欣赏我们可以解决这个问题，但我希望OrmLite能够将TimeSpans映射为OrmLite方言的一部分，甚至可以存储为刻度线？我不确定是否有必要实施IConvertible来解决这个问题。
注意：我们有意在数据模型中使用TimeSpan C＃类型来表示仅表示时间而非日期的字段，以明确用法。
答案 0 :(得分：1)
对于遇到相同问题的任何人，Demis现在已经发布了4.0.8中的更新，该更新为所有提供商提供了对TimeSpan的支持。