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Complex Filter with C# - V1 SOAP

Complex Filter with C# - V1 SOAP


I'm using C#, and I'm trying to list customer.list from SOAP API V1.

All the examples I found was in PHP, and the problem is, I know nothing in PHP(Jon Snow).


I already tried to use Dictionary, but when I send my object to call() method, I got the answer that is not supported. 


The only example I got using complex filter is this below:

$client = new SoapClient('http://magentohost/api/v2_soap/?wsdl');

// If some stuff requires api authentification,
// then get a session token
$session = $client->login('apiUser', 'apiKey');
$complexFilter = array(
    'complex_filter' => array(
            'key' => 'group_id',
            'value' => array('key' => 'in', 'value' => '1,3')
$result = $client->customerCustomerList($session, $complexFilter);

var_dump ($result);

And I need to do this filter using the "created_at" filter.

I already tried this:

Dictionary<string, Dictionary<string, string>> complexFilter = new Dictionary<string, Dictionary<string, string>>();
            Dictionary<string, string> temp = new Dictionary<string, string>();
            string temp2 = "2017-01-14";
            temp.Add("created_at", temp2);
            complexFilter.Add("complex_filter", temp);
            var returnObject =, "customer.list", complexFilter);

but it doen't work either.


Can someone give me a light, please? 

I'm getting mad...