DbRawSqlQuery<TElement>.ToDictionaryAsync<TKey> 方法 (Func<TElement, TKey>)
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根據指定的索引鍵選取器函式,透過列舉以非同步方式從查詢建立 Dictionary<TKey, TValue>。
命名空間: System.Data.Entity.Infrastructure
組件: EntityFramework (在 EntityFramework.dll 中)
語法
'宣告
<SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")> _
Public Function ToDictionaryAsync(Of TKey) ( _
keySelector As Func(Of TElement, TKey) _
) As Task(Of Dictionary(Of TKey, TElement))
'用途
Dim instance As DbRawSqlQuery
Dim keySelector As Func(Of TElement, TKey)
Dim returnValue As Task(Of Dictionary(Of TKey, TElement))
returnValue = instance.ToDictionaryAsync(keySelector)
[SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public Task<Dictionary<TKey, TElement>> ToDictionaryAsync<TKey>(
Func<TElement, TKey> keySelector
)
[SuppressMessageAttribute(L"Microsoft.Design", L"CA1006:DoNotNestGenericTypesInMemberSignatures")]
public:
generic<typename TKey>
Task<Dictionary<TKey, TElement>^>^ ToDictionaryAsync(
Func<TElement, TKey>^ keySelector
)
[<SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")>]
member ToDictionaryAsync :
keySelector:Func<'TElement, 'TKey> -> Task<Dictionary<'TKey, 'TElement>>
JScript does not support generic types and methods.
類型參數
- TKey
由 keySelector 傳回之索引鍵的類型。
參數
- keySelector
類型:System.Func<TElement, TKey>
用來從各個項目擷取索引鍵的函式。
傳回值
類型:System.Threading.Tasks.Task<Dictionary<TKey, TElement>>
表示非同步作業的工作。工作結果包含 Dictionary<TKey, TValue>,其包含選取的索引鍵和值。
備註
不支援相同內容執行個體上的多個作用中作業。 使用 'await' 確保在此內容上呼叫另一個方法之前,所有非同步作業都已完成。