WCF - Retrieve Types from server in client

Question

How to retrieve unknown types of contract in client when the the WCF server implements ServiceKnownType?

Types that pose problems, are not returned or used as a parameter. I integrated GetKnowTypes() on my server like this: WCF Problem Sending Object To Client

[ServiceKnownType("GetKnownTypes", typeof(KnownTypesProvider))]
public interface ITestCallback
{
    //What I liked to do:
    [OperationContract(IsOneWay = true)]
    void TestPropertyChanged<T>(string propertyName, Type propertyType, T propertyValue);

    //What I think is required:
    [OperationContract(IsOneWay = true)]
    void TestSerializedPropertyChanged(string propertyName, string propertyType, string serializedPropertyValue);
}

Apparently we can not use Type T. So I serialized my property, and I would like to deserialize in my client, but for that I need the original Type.

I would like to get Types with something like this in the client:

/// <summary>
/// Get custom types from server
/// </summary>    
private Type GetPropertyType(string typeName)
{
    try
    {
        var types = KnownTypesProvider.GetKnownTypes(); //ERROR : The name 'KnownTypesProvider' does not exist in current context
        foreach (var knownType in types)
        {
            if (knownType != null && knownType.FullName == typeName)
                return knownType;
        }
    }
    catch (Exception)
    {
    }
}

Is it possible ? and How ?