SelectValue<TOutput>(Func<T,TOutput>) Method

Transforms the value of a value result using a specified function.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<NotNullAttribute()>
Public Overloads Function SelectValue(Of TOutput)( _
   ByVal valueSelector As Func(Of T,TOutput) _
) As ValueResult(Of TOutput)

'Usage
 
Dim instance As ValueResult(Of T)
Dim valueSelector As Func(Of T,TOutput)
Dim value As ValueResult(Of TOutput)
 
value = instance.SelectValue(Of TOutput)(valueSelector)

[NotNull()]
public ValueResult<TOutput> SelectValue<TOutput>( 
   Func<T,TOutput> valueSelector
)

[NotNull()]
public:
ValueResult<TOutput^>^ SelectValuegeneric<typename TOutput>
( 
   Func<T^,TOutput^>^ valueSelector
)

Parameters

valueSelector: A transform function to apply to the value.
The value of this parameter cannot be null (Nothing in Visual Basic).

Type Parameters

TOutput: The type of the value returned by valueSelector.

Return Value

A ValueResult<T> where the value is transformed using the transform function, if the value result represents a success. If the value result represents a failure, a ValueResult<T> representing the same failure is returned.

This method never returns null (Nothing in Visual Basic).

Exceptions

Exception Description

Exception	Description
System.ArgumentNullException	A `null` reference (`Nothing` in Visual Basic) is passed to a method that does not accept it as a valid argument. This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

System.ArgumentNullException

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

Reference

ValueResult<T> Class
ValueResult<T> Members
Overload List

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