DisposeGuardNotNull<TResult>(Func<TResult>,Boolean) Method

Invokes the specified function returning a not-null value if the object is not disposed, optionally throwing an exception otherwise.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<JetBrains.Annotations.AssertionMethodAttribute()>
<JetBrains.Annotations.NotNullAttribute()>
Protected Overloads Function DisposeGuardNotNull(Of TResult)( _
   ByVal function As Func(Of TResult), _
   ByVal throwOnDisposed As Boolean _
) As TResult

'Usage
 
Dim instance As DisposableObject
Dim function As Func(Of TResult)
Dim throwOnDisposed As Boolean
Dim value As TResult
 
value = instance.DisposeGuardNotNull(Of TResult)(function, throwOnDisposed)

[JetBrains.Annotations.AssertionMethod()]
[JetBrains.Annotations.NotNull()]
protected TResult DisposeGuardNotNull<TResult>( 
   Func<TResult> function,
   bool throwOnDisposed
)

[JetBrains.Annotations.AssertionMethod()]
[JetBrains.Annotations.NotNull()]
protected:
TResult^ DisposeGuardNotNullgeneric<typename TResult>
( 
   Func<TResult^>^ function,
   bool throwOnDisposed
)

Parameters

function: The function to be invoked.
The value of this parameter cannot be null (Nothing in Visual Basic).
throwOnDisposed: Whether to throw an exception when the object is disposed.

Type Parameters

TResult: The type of the return value of the function.

Return Value

The return value of the function.

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.ObjectDisposedException	An operation was performed on a disposed object.

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.ObjectDisposedException An operation was performed on a disposed object.

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

DisposableObject Class
DisposableObject Members
Overload List

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