Deserializing nested json into vb.net class using json.net

Question

I have some json which I am trying to deserialise into some vb.net objects

Here are the classes

<Serializable()>
Public Class DPDError
  Public Property errorAction As String
  Public Property errorCode As String
  Public Property errorMessage As String
  Public Property errorObj As String
  Public Property errorType As String
End Class

<Serializable()>
Public Class DPDCountry
  Public Property countryCode As String
  Public Property countryName As String
  Public Property isoCode As String
  Public Property isEUCountry As Boolean
  Public Property isLiabilityAllowed As Boolean
  Public Property liabilityMax As Integer
  Public Property isPostcodeRequired As Boolean
End Class

 '----- USED TO GET ALL COUNTRY INFO
<Serializable()>
Public Class DPDMultiCountryDataResponse
  Public Property Countries as List(Of DPDCountry)
End Class

<Serializable()>
Public Class DPDMultiCountryDataRequest
  Public Property DpdError As DPDError
  Public Property Data As DPDMultiCountryDataResponse
End Class

Here is the JSON:

{
    "data": {
        "country": [
            {
                "countryCode": "UY",
                "countryName": "Uruguay",
                "isoCode": "858",
                "isEUCountry": false,
                "isLiabilityAllowed": true,
                "liabilityMax": 15000,
                "isPostcodeRequired": true
            },
            {
                "countryCode": "US",
                "countryName": "Usa",
                "isoCode": "840",
                "isEUCountry": false,
                "isLiabilityAllowed": true,
                "liabilityMax": 15000,
                "isPostcodeRequired": true
            },
            {
                "countryCode": "VU",
                "countryName": "Vanuatu",
                "isoCode": "548",
                "isEUCountry": false,
                "isLiabilityAllowed": true,
                "liabilityMax": 15000,
                "isPostcodeRequired": true
            },
            {
                "countryCode": "VN",
                "countryName": "Vietnam",
                "isoCode": "704",
                "isEUCountry": false,
                "isLiabilityAllowed": true,
                "liabilityMax": 15000,
                "isPostcodeRequired": true
            }
        ]
    }
}

Here is the code to deserialise it

Dim oResponseData As DPDMultiCountryDataRequest = _
    JsonConvert.DeserializeObject(Of DPDMultiCountryDataRequest)(tmp)

The countries list is always nothing. The higher level ones are fine. I also have a routine which gets ONE country info which works fine. Its the multiple countries that is killing me.

I have tried an array, an iList, a dictionary and the list as above and nothing works.

Answer 1

The property must be called Country, not Countries:

<Serializable()>
Public Class DPDMultiCountryDataResponse
    Public Property Country as List(Of DPDCountry)

Alternatively you could use the JsonProperty attribute:

<Serializable()>
Public Class DPDMultiCountryDataResponse
    <JsonProperty(PropertyName = "Country")>
    Public Property Countries as List(Of DPDCountry)

Also bear in mind that the Serializable attribute is not needed. It is used only for binary serialization.