4

SmartyStreets JSON LiveAddress APIを使用しようとしていますが、問題が発生しています。私はJSONにあまり精通していないことを認めます。とにかく、私はいくつかの異なる方法を試しましたが、通常、「JSON配列をメタデータ型に逆シリアル化できません」というエラーが発生します。

JSON文字列は次のとおりです。

[{"input_index":0,"candidate_index":0,"delivery_line_1":"1600 Amphitheatre Pkwy","last_line":"Mountain View CA 94043-1351","delivery_point_barcode":"940431351000","components":{"primary_number":"1600","street_name":"Amphitheatre","street_suffix":"Pkwy","city_name":"Mountain View","state_abbreviation":"CA","zipcode":"94043","plus4_code":"1351","delivery_point":"00","delivery_point_check_digit":"0"},"metadata":{"record_type":"S","county_fips":"06085","county_name":"Santa Clara","carrier_route":"C058","congressional_district":"14"},"analysis":{"dpv_match_code":"Y","dpv_footnotes":"AABB","dpv_cmra":"N","dpv_vacant":"N","ews_match":false,"footnotes":"N#"}}]

jsontocsharpwebappを使用してクラスを作成しました。

これが私が使用しているコードです：

using (var webClient = new WebClient())
        {
            var json = webClient.DownloadString("url");

            var md = JsonConvert.DeserializeObject<Metadata>(json);
            litTest.Text = md.county_name;
        }

次に、上記のエラーがスローされます。

どんな援助でも大歓迎です。

ありがとう、アンドリュー

4

2 に答える 2

5

I'm a developer at SmartyStreets--thanks for using our service!

The main thing you should understand is that the JSON response is an array of address objects, not just one. This is because an address may be ambiguous, requiring selection/confirmation by the consumer.

So that means you need to tell Json.Net to deserialize the JSON as the top-level address object and then traverse into each address to get the metadata (you were trying to parse the metadata directly, which doesn't work because there's one metadata section for each address in the array returned). That's basically what L.B is doing in his answer, except he's added some extra overhead in order to use dynamic.

Here's an alternate solution that uses the same "DeserializeObject" from your question:

namespace JsonFun
{
    using System;
    using System.Net;
    using Newtonsoft.Json;

    class Program
    {
        private const string Url = "https://api.qualifiedaddress.com/street-address/?street=1600%20Amphitheatre%20Parkway&street2=&city=Mountain%20View&state=CA&zipcode=94043&candidates=10&auth-token=YOUR_AUTH_TOKEN_HERE";

        static void Main()
        {
            using (var webClient = new WebClient())
            {
                var json = webClient.DownloadString(Url);

                var candidate_addresses = JsonConvert.DeserializeObject<CandidateAddress[]>(json);
                foreach (var item in candidate_addresses)
                    Console.WriteLine(item.metadata.county_name);

                Console.ReadLine();
            }
        }
    }

    public class CandidateAddress
    {
        public int input_index { get; set; }
        public int candidate_index { get; set; }
        public string delivery_line_1 { get; set; }
        public string last_line { get; set; }
        public string delivery_point_barcode { get; set; }
        public Components components { get; set; }
        public Metadata metadata { get; set; }
        public Analysis analysis { get; set; }
    }

    public class Components
    {
        public string primary_number { get; set; }
        public string street_name { get; set; }
        public string street_suffix { get; set; }
        public string city_name { get; set; }
        public string state_abbreviation { get; set; }
        public string zipcode { get; set; }
        public string plus4_code { get; set; }
        public string delivery_point { get; set; }
        public string delivery_point_check_digit { get; set; }
    }

    public class Metadata
    {
        public string record_type { get; set; }
        public string county_fips { get; set; }
        public string county_name { get; set; }
        public string carrier_route { get; set; }
        public string congressional_district { get; set; }
        public double latitude { get; set; }
        public double longitude { get; set; }
        public string precision { get; set; }
    }

    public class Analysis
    {
        public string dpv_match_code { get; set; }
        public string dpv_footnotes { get; set; }
        public string dpv_cmra { get; set; }
        public string dpv_vacant { get; set; }
        public bool ews_match { get; set; }
        public string footnotes { get; set; }
    }
}

So, in the end it will depend on whether you want to work with a statically typed response object or a dynamic one. Good luck!

EDIT: Included Latitude/Longitude fields in sample response (newly released).

于 2012-03-02T16:44:40.353 に答える
4

これらの場合はオブジェクトを使用することを好みdynamicます（醜いクラスを作成する必要はありません）

そのような：

dynamic jsonObj = JsonUtils.JsonObject.GetDynamicJsonObject(json);
foreach(var item in jsonObj)
{
    Console.WriteLine(item.delivery_line_1 + ", " + 
                      item.last_line + ", " +
                      item.metadata.county_name + ", " +
                      item.components.street_name + ", " + 
                      item.components.city_name  );

}

Dynamic Json Objectのソース(コピーしてプロジェクトに貼り付けるだけ) といくつかのサンプルを次に示します。

PS: これは、より読みやすい形式の json 文字列です。

[
    {
        "input_index": 0,
        "candidate_index": 0,
        "delivery_line_1": "1600 Amphitheatre Pkwy",
        "last_line": "Mountain View CA 94043-1351",
        "delivery_point_barcode": "940431351000",
        "components": {
            "primary_number": "1600",
            "street_name": "Amphitheatre",
            "street_suffix": "Pkwy",
            "city_name": "Mountain View",
            "state_abbreviation": "CA",
            "zipcode": "94043",
            "plus4_code": "1351",
            "delivery_point": "00",
            "delivery_point_check_digit": "0"
        },
        "metadata": {
            "record_type": "S",
            "county_fips": "06085",
            "county_name": "Santa Clara",
            "carrier_route": "C058",
            "congressional_district": "14"
        },
        "analysis": {
            "dpv_match_code": "Y",
            "dpv_footnotes": "AABB",
            "dpv_cmra": "N",
            "dpv_vacant": "N",
            "ews_match": false,
            "footnotes": "N#"
        }
    }
]
于 2012-03-01T18:59:53.260 に答える