title: Json.Net Combine 2 Properties on Serialization
body: <p>I'm still fairly new to Json.Net and (de)serializing. I have an object which has a few fields</p>
  
  <pre><code>public class Person {
      public string Id { get; set; }
      public string FirstName { get; set; }
      public string LastName { get; set; }
      public string Address1 { get; set; }
      public string Address2 { get; set; }
  }
  
  var p = new Person() {
      Id = 123,
      FirstName = "John",
      LastName = "Doe",
      Address1 = "456 Main St",
      Address2 = "Apt 2"
  }
  </code></pre>
  
  <p>I need to serialize to the following json</p>
  
  <pre><code>{
      "id": 123
      , "fullName": "John Doe"
      , "street": "456 Main St Apt 2"
  }
  </code></pre>
  
  <p>And deserialize that to</p>
  
  <pre><code>// Person.Id = 123
  // Person.Address1 = 456 Main St Apt 2
  // Person.Address2 = null
  
  // we are ok not trying to split the 'street' into both 'Address1' and 'Address2'
  </code></pre>
  
  <p>I'm not sure the best method to do this. Do I need to use a <code>Converter</code>, <code>ExtensionData</code>, <code>Constructor</code>, or something else I haven't found because I don't know how to search for it ;) </p>
  
  <p>Any help and examples would be great.</p>