Tha hash values are arrays. These arrays can contain some hash too. Below is the output from Data::Dumper.

I need these values imported av hash/"collection" in C#

$VAR1 = bless( {
                 'INTERFACE' => [
                                  undef,
                                  'vlanX'
                                ],
                 'LOCATION' => 'X3',
                 'ACELOGICAL' => 'user',
                 'CHILD' => [
                              bless( {
                                       'IPROUTE' => '0.0.0.0 0.0.0.0 x
+xx.xxx.x.x.',
                                       'NAME' => 'vlanX',
                                       'ACE' => 'ACEx',
                                       'CHILD' => [
                                                    bless( {
                                                             'IPROUTE'
+ => undef,
 'NAME' => 'name',
 'INTERFACE' => 'vlanX',
 'ACE' => undef,
 'SERVERFARM' => undef,
 'CHILD' => [],
 'OSID' => [],
 'ALIAS' => undef,
 'OBJECTID' => undef,
 'PARENT' => [
               $VAR1->{'CHILD'}[0]
             ],
 'MASTERSHAPE' => 'ACE_RSERVER',
 'CONTEXT' => 'Cntext',
 'SHAPEID' => [],
 'IPADDRESS' => 'xxx.xxx.x.xx'
}, 'some value' ),
                                                             'IPROUTE'
+ => undef,
 'NAME' => 'name',
 'INTERFACE' => 'vlanX',
 'ACE' => undef,
 'SERVERFARM' => undef,
 'CHILD' => [],
 'OSID' => [],
 'ALIAS' => undef,
 'OBJECTID' => undef,
 'PARENT' => [
               $VAR1->{'CHILD'}[0]
             ],
 'MASTERSHAPE' => 'ACE',
 'CONTEXT' => 'some value ',
 'SHAPEID' => [],
 'IPADDRESS' => 'xxx.xxx.x.xx'
}, 'some value' ),
.
.
.
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JSON cannot transport "objects". What would C# do with Perl classes?

You will need to convert your objects to plain hashes (or arrays) that contain the relevant data.

Thank you for your answer.

I was not aware of that :(