將JSON轉換為DataTable在c#中返回空結果

Question

我正在嘗試將我的 json 數據轉換為數據表。 遵循了這篇文章中的所有方法以及所有建議的鏈接在 stackoverflow 上，嘗試了很多方法，但仍然沒有結果。

我的方法看起來像：

    public static async Task GetManagements()
    {
        Console.WriteLine("Getting managements");

        using var client = new HttpClient();

        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", 
        await Token.GetToken());

        HttpResponseMessage response = await client.GetAsync(LibvirtUrls.managementUrl);
        HttpContent content = response.Content;

        Console.WriteLine("Response Status Code: " + (int)response.StatusCode);
        string result = await content.ReadAsStringAsync();
        var json = Helpers.FormatJson(result);
        Console.WriteLine("json");
        Console.WriteLine(result); // for testing
        Console.WriteLine(new string('-',35));
        Console.WriteLine("formatted");
        Console.WriteLine(json); // for testing
        // I used both result and json (formatted and not formatted one)
        Console.WriteLine(new string('-',35));
        List<NetworkDto> networkList = 
        JsonConvert.DeserializeObject<List<NetworkDto>>(json);
        Console.WriteLine("table view");
        var ss = networkList.ToDataTable<NetworkDto>();
        Console.WriteLine(ss);
    }

示例json是執行方法后：

Getting managements as json
Response Status Code: 200
json
[{"id":1,"netMask":22,"gateway":"10.19.0.1","jenkinsUrl":"http://10.19.0.20:31000","bridge":"br0","ipRange":"10.19.0.1-10.19.3.254"},{"id":11,"netMask":22,"gateway":"10.23.0.1","jenkinsUrl":"http://10.12.3.12:33355","bridge":"br2","ipRange":"10.23.0.4-10.23.0.20"}]
------------------------------------------
formatted
[
    {
        "id":1,
        "netMask":22,
        "gateway":"10.19.0.1",
        "jenkinsUrl":"http://10.19.0.20:31000",
        "bridge":"br0",
        "ipRange":"10.19.0.1-10.19.3.254"
    },
    {
        "id":11,
        "netMask":22,
        "gateway":"10.23.0.1",
        "jenkinsUrl":"http://10.12.3.12:33355",
        "bridge":"br2",
        "ipRange":"10.23.0.4-10.23.0.20"
    }
]
------------------------------------------------
table view

也嘗試過類：

    public class NetworkDto
    {
        public int Id { get; set; }
        public int NetMask { get; set; }
        public string Gateway { get; set; }
        public string JenkinsUrl { get; set; }
        public string Bridge { get; set; }
        public string IpRange { get; set; }
    }

我用於將 json 轉換為數據表的擴展方法：

    public static DataTable ToDataTable<T>(this IList<T> data)
    {
        PropertyDescriptorCollection props =
            TypeDescriptor.GetProperties(typeof(T));
        DataTable table = new DataTable();
        for(int i = 0 ; i < props.Count ; i++)
        {
            PropertyDescriptor prop = props[i];
            table.Columns.Add(prop.Name, prop.PropertyType);
        }
        object[] values = new object[props.Count];
        foreach (T item in data)
        {
            for (int i = 0; i < values.Length; i++)
            {
                values[i] = props[i].GetValue(item);
            }
            table.Rows.Add(values);
        }
        return table;        
    }

Answer 1

我檢查了你的代碼：

        static void Main() {
        string json = "[{\"id\":1,\"netMask\":22,\"gateway\":\"10.19.0.1\",\"jenkinsUrl\":\"http://10.19.0.20:31000\",\"bridge\":\"br0\",\"ipRange\":\"10.19.0.1-10.19.3.254\"},{\"id\":11,\"netMask\":22,\"gateway\":\"10.23.0.1\",\"jenkinsUrl\":\"http://10.12.3.12:33355\",\"bridge\":\"br2\",\"ipRange\":\"10.23.0.4-10.23.0.20\"}]";

        System.Data.DataTable dt = (System.Data.DataTable)JsonConvert.DeserializeObject(json, (typeof(System.Data.DataTable)));
        Console.WriteLine(dt);

        for (int i = 0; i < dt.Columns.Count; i++) {
            Console.Write(dt.Columns[i] + " | ");
        }
        Console.WriteLine();
        for (int j = 0; j < dt.Rows.Count; j++) {

            for (int i = 0; i < dt.Columns.Count; i++) {
                Console.Write(dt.Rows[j].ItemArray[i] + " | ");
            }
            Console.WriteLine();

        }
    }

輸出：

身份證 | 網罩 | 網關 | jenkinsUrl | 橋| ip范圍|

1 | 22 | 10.19.0.1 | http://10.19.0.20:31000 | br0 | 10.19.0.1-10.19.3.254 |

11 | 22 | 10.23.0.1 | http://10.12.3.12:33355 | br2 | 10.23.0.4-10.23.0.20 |

看來，數據表被填滿了

Answer 2

從 JSON 反序列化為自定義對象列表很簡單：

List<NetworkDto> networkList = JsonConvert.DeserializeObject<List<NetworkDto>>(json);

就是這樣！ 現在您的networkList變量是一個 NetworkDto 對象列表。 如果您想驗證它們是否在控制台中，您可以將它們全部寫出到控制台：

foreach(var network in networkList)
(
    Console.WriteLine($"Network Id {network.Id}");
)