私はASP.NETプロジェクトでLINQ to SQLを使用しています。テーブルを挿入する際に、値を特定のテーブルオブジェクトに変換する必要があり、挿入する必要があります。どのようにlinqクラス(テーブル)のパラメータを持つ別のコンストラクタを追加する
私は、そのテーブルオブジェクトに値を割り当てることができるように、そのテーブルに新しいコンストラクタを作成しましたが、割り当ては機能していますが、挿入中に(obj.TS_Questions.InsertOnSubmit(mytableobject);
)null例外が発生します。
私のコード::私が
default constructor for my table
public TS_Question()
{
this._TS_Options = new EntitySet<TS_Option>(new Action<TS_Option>(this.attach_TS_Options), new Action<TS_Option>(this.detach_TS_Options));
this._TS_QuestGroups = new EntitySet<TS_QuestGroup>(new Action<TS_QuestGroup>(this.attach_TS_QuestGroups), new Action<TS_QuestGroup>(this.detach_TS_QuestGroups));
this._TS_QuestRecords = new EntitySet<TS_QuestRecord>(new Action<TS_QuestRecord>(this.attach_TS_QuestRecords), new Action<TS_QuestRecord>(this.detach_TS_QuestRecords));
this._TS_Admin = default(EntityRef<TS_Admin>);
this._TS_LevelType = default(EntityRef<TS_LevelType>);
this._TS_OptionTypeLT = default(EntityRef<TS_OptionTypeLT>);
OnCreated();
}
コンストラクタを作成したが
public TS_Question(Guid Quest_QuestIDBL, string Quest_NameBL, Nullable<Guid> Quest_OptionTypeIDBL, Guid Quest_AdminIDBL, Guid Ques_LevelIDBL, int Quest_TimeBL, int Quest_MarkBL, string Qest_ExplanationBL, Nullable<bool> Qest_IsMultipleAnswerBL)
{
this._TS_Options = new EntitySet<TS_Option>(new Action<TS_Option>(this.attach_TS_Options), new Action<TS_Option>(this.detach_TS_Options));
this._TS_QuestGroups = new EntitySet<TS_QuestGroup>(new Action<TS_QuestGroup>(this.attach_TS_QuestGroups), new Action<TS_QuestGroup>(this.detach_TS_QuestGroups));
this._TS_QuestRecords = new EntitySet<TS_QuestRecord>(new Action<TS_QuestRecord>(this.attach_TS_QuestRecords), new Action<TS_QuestRecord>(this.detach_TS_QuestRecords));
this._TS_Admin = default(EntityRef<TS_Admin>);
this._TS_LevelType = default(EntityRef<TS_LevelType>);
this._TS_OptionTypeLT = default(EntityRef<TS_OptionTypeLT>);
OnCreated();
this._Quest_QuestID = Quest_QuestIDBL;
this._Quest_Name = Quest_NameBL;
if (Quest_OptionTypeIDBL != null)
{
this._Quest_OptionTypeID = Quest_OptionTypeIDBL;
}
this._Quest_AdminID = Quest_AdminIDBL;
this._Ques_LevelID = Ques_LevelIDBL;
this._Quest_Time = Quest_TimeBL;
this._Quest_Mark = Quest_MarkBL;
this._Qest_Explanation = Qest_ExplanationBL;
this._Qest_IsMultipleAnswer = Qest_IsMultipleAnswerBL;
}
、
[.NETのNullReferenceExceptionは何ですか?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-in-net) –