ObjectContext.LoadProperty<TEntity> 方法 (TEntity, Expression<Func<TEntity, Object>>, MergeOption)
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由指定的 LINQ 查詢和使用指定的合併選項,明確地載入所提供之物件的相關物件。
命名空間: System.Data.Entity.Core.Objects
組件: EntityFramework (在 EntityFramework.dll 中)
語法
'宣告
<SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")> _
Public Overridable Sub LoadProperty(Of TEntity) ( _
entity As TEntity, _
selector As Expression(Of Func(Of TEntity, Object)), _
mergeOption As MergeOption _
)
'用途
Dim instance As ObjectContext
Dim entity As TEntity
Dim selector As Expression(Of Func(Of TEntity, Object))
Dim mergeOption As MergeOption
instance.LoadProperty(entity, selector, _
mergeOption)
[SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public virtual void LoadProperty<TEntity>(
TEntity entity,
Expression<Func<TEntity, Object>> selector,
MergeOption mergeOption
)
[SuppressMessageAttribute(L"Microsoft.Design", L"CA1006:DoNotNestGenericTypesInMemberSignatures")]
public:
generic<typename TEntity>
virtual void LoadProperty(
TEntity entity,
Expression<Func<TEntity, Object^>^>^ selector,
MergeOption mergeOption
)
[<SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")>]
abstract LoadProperty :
entity:'TEntity *
selector:Expression<Func<'TEntity, Object>> *
mergeOption:MergeOption -> unit
[<SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")>]
override LoadProperty :
entity:'TEntity *
selector:Expression<Func<'TEntity, Object>> *
mergeOption:MergeOption -> unit
JScript does not support generic types and methods.
類型參數
- TEntity
實體的類型。
參數
- entity
類型:TEntity
要載入相關物件的來源物件。
- selector
類型:System.Linq.Expressions.Expression<Func<TEntity, Object>>
定義要載入之相關物件的 LINQ 運算式。
- mergeOption
類型:System.Data.Entity.Core.Objects.MergeOption
在您載入相關物件時所要使用的 MergeOption 值。
例外狀況
例外狀況 | 條件 |
---|---|
ArgumentException | selector 並未提供有效的輸入參數。 |
ArgumentNullException | selector 為 null。 |
InvalidOperationException | 實體的狀態為 Detached、[F:System.Data.Entity.EntityState.Added,] 或 Deleted,或者實體已附加至 ObjectContext 的其他執行個體。 |