Connectivity Software User's Guide and Reference
GetFieldValueOrNull67 Method



OpcLabs.BaseLibPrimitives Assembly > OpcLabs.BaseLib.Extensions.Internal Namespace > TypeExtensionR Class : GetFieldValueOrNull67 Method

The value of this parameter cannot be null (Nothing in Visual Basic).

The value of this parameter can be null (Nothing in Visual Basic).

The value of this parameter cannot be null (Nothing in Visual Basic).

Returns the value of a public or non-public field with a specified name (exact or starting with an underscore) on a specified type.
Syntax
'Declaration
 
<ExtensionAttribute()>
<JetBrains.Annotations.CanBeNullAttribute()>
Public Shared Function GetFieldValueOrNull67( _
   ByVal type As Type, _
   ByVal obj As Object, _
   ByVal name As String _
) As Object
'Usage
 
Dim type As Type
Dim obj As Object
Dim name As String
Dim value As Object
 
value = TypeExtensionR.GetFieldValueOrNull67(type, obj, name)
[Extension()]
[JetBrains.Annotations.CanBeNull()]
public static object GetFieldValueOrNull67( 
   Type type,
   object obj,
   string name
)
[Extension()]
[JetBrains.Annotations.CanBeNull()]
public:
static Object^ GetFieldValueOrNull67( 
   Type^ type,
   Object^ obj,
   String^ name
) 

Parameters

type

The value of this parameter cannot be null (Nothing in Visual Basic).

obj

The value of this parameter can be null (Nothing in Visual Basic).

name

The value of this parameter cannot be null (Nothing in Visual Basic).

Return Value

This method can return null (Nothing in Visual Basic).

Exceptions
ExceptionDescription

One of the arguments provided to a method is not valid.

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.

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.

There was an invalid attempt to access a private or protected field inside a class.
An invoked method is not supported at all, or is not supported with the parameters used to create the object.
An attempt was made to invoke an invalid target.
Remarks
On .net7 or .net6 some field name starts with underscore, on .net4 nor .net6 do not.

This is an extension method (info: C#, VB.NET). In languages that have support for extensions methods (such as C# and VB.NET), you can use the extension method as if it were a regular method on the object that is its first parameter. In other languages (such as with Python.NET), you will call the extension as a static method, and pass it the object on which it acts as its first parameter.

Requirements

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

See Also