DomainObjectExtensionsGetValueOrDefaultTObject, TResult Method

Gets a nullable value for domain object properties, which are based on a non-nullable data attributes. The expression should be in the format 's => s.Property'.

Namespace: Aloe.SystemFrameworks.Domain.Extensions
Assembly: Aloe.SystemFrameworks.Domain (in Aloe.SystemFrameworks.Domain.dll) Version: 20.1.3.5

Syntax

C++

Copy

public static Nullable<TResult> GetValueOrDefault<TObject, TResult>(
	this TObject obj,
	Expression<Func<TObject, TResult>> memberExpression
)
where TObject : DomainObject
where TResult : struct, new()

<ExtensionAttribute>
Public Shared Function GetValueOrDefault(Of TObject As DomainObject, TResult As {Structure, New}) ( 
	obj As TObject,
	memberExpression As Expression(Of Func(Of TObject, TResult))
) As Nullable(Of TResult)

public:
[ExtensionAttribute]
generic<typename TObject, typename TResult>
where TObject : DomainObject
where TResult : value class, gcnew()
static Nullable<TResult>^ GetValueOrDefault(
	TObject obj, 
	Expression<Func<TObject, TResult>^>^ memberExpression
)

[<ExtensionAttribute>]
static member GetValueOrDefault : 
        obj : 'TObject * 
        memberExpression : Expression<Func<'TObject, 'TResult>> -> Nullable<'TResult>  when 'TObject : DomainObject when 'TResult : struct, new()

Parameters

obj: Type: TObject
The object.
memberExpression: Type: System.Linq.ExpressionsExpressionFuncTObject, TResult
The expression in the format 's => s.Property'.

Type Parameters

TObject: The type of the object.
TResult: The type of the result.

Return Value

Type: NullableTResult
The nullable value of the property.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type . 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).

Reference

DomainObjectExtensions Class