使用Json.NET反序列化復雜對象

Question

我需要反序列化從grogle maps api返回的這個json：

{
    "destination_addresses": [
        "Via Medaglie D'Oro, 10, 47121 Forlì FC, Italia",
        "Via Torino, 20123 Milano, Italia",
        "Via Guglielmo Marconi, 71, 40121 Bologna, Italia",
        "Via Irnerio, 40126 Bologna, Italia"
    ],
    "origin_addresses": [
        "Via Medaglie D'Oro, 10, 47121 Forlì FC, Italia",
        "Via Torino, 20123 Milano, Italia",
        "Via Guglielmo Marconi, 71, 40121 Bologna, Italia",
        "Via Irnerio, 40126 Bologna, Italia"
    ],
    "rows": [
        {
            "elements": [
                {
                    "distance": {
                        "text": "1 m",
                        "value": 0
                    },
                    "duration": {
                        "text": "1 min",
                        "value": 0
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "286 km",
                        "value": 286281
                    },
                    "duration": {
                        "text": "2 ore 48 min",
                        "value": 10083
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "80,1 km",
                        "value": 80088
                    },
                    "duration": {
                        "text": "1 ora 3 min",
                        "value": 3789
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "77,6 km",
                        "value": 77594
                    },
                    "duration": {
                        "text": "57 min",
                        "value": 3422
                    },
                    "status": "OK"
                }
            ]
        },
        {
            "elements": [
                {
                    "distance": {
                        "text": "288 km",
                        "value": 287811
                    },
                    "duration": {
                        "text": "2 ore 48 min",
                        "value": 10052
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "1 m",
                        "value": 0
                    },
                    "duration": {
                        "text": "1 min",
                        "value": 0
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "212 km",
                        "value": 212423
                    },
                    "duration": {
                        "text": "2 ore 8 min",
                        "value": 7664
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "218 km",
                        "value": 218219
                    },
                    "duration": {
                        "text": "2 ore 9 min",
                        "value": 7740
                    },
                    "status": "OK"
                }
            ]
        },
        {
            "elements": [
                {
                    "distance": {
                        "text": "78,5 km",
                        "value": 78528
                    },
                    "duration": {
                        "text": "56 min",
                        "value": 3346
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "212 km",
                        "value": 212190
                    },
                    "duration": {
                        "text": "2 ore 5 min",
                        "value": 7519
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "1 m",
                        "value": 0
                    },
                    "duration": {
                        "text": "1 min",
                        "value": 0
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "2,0 km",
                        "value": 1979
                    },
                    "duration": {
                        "text": "5 min",
                        "value": 316
                    },
                    "status": "OK"
                }
            ]
        },
        {
            "elements": [
                {
                    "distance": {
                        "text": "74,7 km",
                        "value": 74719
                    },
                    "duration": {
                        "text": "55 min",
                        "value": 3278
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "218 km",
                        "value": 217951
                    },
                    "duration": {
                        "text": "2 ore 9 min",
                        "value": 7712
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "3,8 km",
                        "value": 3782
                    },
                    "duration": {
                        "text": "11 min",
                        "value": 671
                    },
                    "status": "OK"
                },
                {
                    "distance": {
                        "text": "1 m",
                        "value": 0
                    },
                    "duration": {
                        "text": "1 min",
                        "value": 0
                    },
                    "status": "OK"
                }
            ]
        }
    ],
    "status": "OK"
}

我需要創建一個距離矩陣，所以我只對“距離”內的“值”字段感興趣。

我嘗試過這種方法：

DataSet data = JsonConvert.DeserializeObject<DataSet>(jsonResponse);
        DataTable dataTab = data.Tables["Elements"];
        foreach (DataRow elements in dataTab.Rows)
        {
            Console.WriteLine(elements["distance"]);
            //Do something else here
        }

但是JSonConvert返回“完成反序列化對象后在JSON字符串中找到的附加文本”。

Answer 1

您應該反序列化到與您的數據匹配的類。 您可以在http://json2csharp.com/上生成這些類。

// use like
var rootObj = JsonConvert.DeserializeObject<RootObject>(jsonResponse);
foreach (var row in rootObj.rows)
{
    foreach (var element in row.elements)
    {
        Console.WriteLine(element.distance.text);
    }
}

// you might want to change the property names to .Net conventions
// use [JsonProperty] to let the serializer know the JSON names where needed
public class Distance
{
    public string text { get; set; }
    public int value { get; set; }
}

public class Duration
{
    public string text { get; set; }
    public int value { get; set; }
}

public class Element
{
    public Distance distance { get; set; }
    public Duration duration { get; set; }
    public string status { get; set; }
}

public class Row
{
    public List<Element> elements { get; set; }
}

public class RootObject
{
    public List<string> destination_addresses { get; set; }
    public List<string> origin_addresses { get; set; }
    public List<Row> rows { get; set; }
    public string status { get; set; }
}

Answer 2

我認為這個問題是基於我發現搜索Stack Overflow的類似問題而轉向'DataSet'。

嘗試這個，因為我相信它會起作用（你可能需要使用'rows'而不是'Elements'，但我相信使用JObject的方法將解決'附加文本'的主要問題。

 JObject json = JsonConvert.DeserializeObject<JObject>(jsonResponse);
 foreach (Dictionary<string, object> item in data["Elements"])
 {
    foreach (string val in item.Values) {
        Console.WriteLine(val);
    }
  }

Answer 3

使用動態：

dynamic json = JsonConvert.DeserializeObject(jsonResponse);

var rowCount = json.rows.Count;
Func<dynamic, int> getElementCount = r => r.elements.Count;
var maxElements = Enumerable.Max(json.rows, getElementCount);

var matrix = new int?[rowCount, maxElements];
for(int i = 0; i < rowCount; i++)
{
    var elements = json.rows[i].elements;
    for(int j = 0; j < elements.Count; j++)
    {
        var element = elements[j];
        matrix[i, j] = element.distance.value;
    }
}