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AsyncSelfServicingExtensionMethods.GetScalarAsync<TValue> Method (IDao, DynamicQuery, ITransaction)
Async variant of GetScalar<TValue>(IDao, DynamicQuery, ITransaction). Fetches a scalar value using the query specified, and returns this value typed as TValue, using a cast. The query specified will be converted to a scalar query prior to execution.

Namespace:  SD.LLBLGen.Pro.QuerySpec.SelfServicing
Assembly:  SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.2.0.0 (5.2.17.0403)
Syntax
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public static Task<TValue> GetScalarAsync<TValue>(
	this IDao dao,
	DynamicQuery query,
	ITransaction transactionToUse
)

Parameters

dao
Type: SD.LLBLGen.Pro.ORMSupportClasses.IDao
The DAO instance.
query
Type: SD.LLBLGen.Pro.QuerySpec.DynamicQuery
The query.
transactionToUse
Type: SD.LLBLGen.Pro.ORMSupportClasses.ITransaction
The transaction to use.

Type Parameters

TValue
The type of the value to return.

Return Value

Type: Task<TValue>
the value to fetch

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IDao. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
Remarks
Use nullable(Of T) for scalars which are a value type, to avoid crashes when the scalar query returns a NULL value.
See Also