Question

我试图将JSON输出反序列化为.net对象，但将输出获取为null。

我已经编写了这段代码来获取JSON数据并反序列化。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;
using Newtonsoft.Json;
namespace ConsoleApp1
{
    public enum httpverb
    {
        GET,
        POST,
        PUT,
        DELETE
    }
    public class Item
    {
        public string item_id { get; set; }
        public string name { get; set; }
        public string item_name { get; set; }
        public string hsn_or_sac { get; set; }
        public string sku { get; set; }
        public string image_name { get; set; }
        public string status { get; set; }
        public string source { get; set; }
        public string description { get; set; }       
        public string cf_category { get; set; }
        public string cf_maximum_retail_price_mrp { get; set; }
        public DateTime created_time { get; set; }
        public DateTime last_modified_time { get; set; }
        public bool track_serial_number { get; set; }
    }
    class APIs
    {
         xxxxxcode goes here to fetch JSON from API and store into variable strResponseValue
         string Jsoncontent = strResponseValue;   //Jsoncontent holds json data
         Item books = JsonConvert.DeserializeObject<Item>(Jsoncontent);
         //how to access each object.
}
}

这是必须反序列化的JSON输出。

  {
    "code": 0,
    "message": "success",
    "items": [
        {
            "item_id": "519558000025988777",
            "name": "0",
            "image_document_id": "",
            "item_name": "0",
            "hsn_or_sac": "",
            "sku": "",
            "image_name": "",
            "status": "active",
            "source": "user",
            "is_linked_with_zohocrm": false,
            "zcrm_product_id": "",
            "description": "",
            "item_tax_preferences": [
                {
                    "tax_specification": "inter",
                    "tax_type": 0,
                    "tax_name": "IGST18",
                    "tax_percentage": 18,
                    "tax_id": "519558000000076071"
                },
                {
                    "tax_specification": "intra",
                    "tax_type": 2,
                    "tax_name": "GST18",
                    "tax_percentage": 18,
                    "tax_id": "519558000000076077"
                }
            ],
            "rate": 1439.84,
            "tax_id": "",
            "reorder_level": "",
            "tax_name": "",
            "tax_percentage": 0,
            "purchase_account_id": "",
            "purchase_account_name": "",
            "account_name": "Sales",
            "unit": "",
            "purchase_description": "",
            "purchase_rate": 0,
            "item_type": "sales",
            "product_type": "goods",
            "is_taxable": true,
            "tax_exemption_id": "",
            "tax_exemption_code": "",
            "has_attachment": false,
            "is_combo_product": false,
            "created_time": "2019-04-25T17:31:13+0530",
            "last_modified_time": "2019-04-25T17:31:13+0530",
            "track_serial_number": false
        },
        {
            "item_id": "519558000005300339",
            "name": "Acer HA270 27\" Full HD IPS White Color Ultra Slim Monitor",
            "image_document_id": "",
            "item_name": "Acer HA270 27\" Full HD IPS White Color Ultra Slim Monitor",
            "hsn_or_sac": "8528",
            "sku": "HA270",
            "image_name": "",
            "status": "active",
            "source": "user",
            "is_linked_with_zohocrm": false,
            "zcrm_product_id": "",
            "description": "",
            "item_tax_preferences": [
                {
                    "tax_specification": "inter",
                    "tax_type": 0,
                    "tax_name": "IGST18",
                    "tax_percentage": 18,
                    "tax_id": "519558000000076071"
                },
                {
                    "tax_specification": "intra",
                    "tax_type": 2,
                    "tax_name": "GST18",
                    "tax_percentage": 18,
                    "tax_id": "519558000000076077"
                }
            ],
            "rate": 16999,
            "tax_id": "",
            "reorder_level": "",
            "tax_name": "",
            "tax_percentage": 0,
            "purchase_account_id": "519558000000043003",
            "purchase_account_name": "Cost of Goods Sold",
            "account_name": "Sales",
            "unit": "Unit",
            "purchase_description": "",
            "purchase_rate": 11300,
            "item_type": "inventory",
            "product_type": "goods",
            "is_taxable": true,
            "tax_exemption_id": "",
            "tax_exemption_code": "",
            "stock_on_hand": -1,
            "has_attachment": false,
            "is_combo_product": false,
            "cf_category": "Monitor",
            "cf_maximum_retail_price_mrp": "18500",
            "created_time": "2019-02-13T18:08:37+0530",
            "last_modified_time": "2019-04-28T16:16:11+0530",
            "track_serial_number": false
        },
        {
            "item_id": "519558000001595908",
            "name": "Acer KA240H bd 24-inch Full HD (1920 x 1080) Display (VGA, DVI Ports)",
            "image_document_id": "",
            "item_name": "Acer KA240H bd 24-inch Full HD (1920 x 1080) Display (VGA, DVI Ports)",
            "hsn_or_sac": "8528",
            "sku": "KA240H",
            "image_name": "",
            "status": "active",
            "source": "user",
            "is_linked_with_zohocrm": false,
            "zcrm_product_id": "",
            "description": "",
            "item_tax_preferences": [
                {
                    "tax_specification": "inter",
                    "tax_type": 0,
                    "tax_name": "IGST18",
                    "tax_percentage": 18,
                    "tax_id": "519558000000076071"
                },
                {
                    "tax_specification": "intra",
                    "tax_type": 2,
                    "tax_name": "GST18",
                    "tax_percentage": 18,
                    "tax_id": "519558000000076077"
                }
            ],
            "rate": 9000,
            "tax_id": "",
            "reorder_level": "",
            "tax_name": "",
            "tax_percentage": 0,
            "purchase_account_id": "519558000000043003",
            "purchase_account_name": "Cost of Goods Sold",
            "account_name": "Sales",
            "unit": "Unit",
            "purchase_description": "",
            "purchase_rate": 6600,
            "item_type": "inventory",
            "product_type": "goods",
            "is_taxable": true,
            "tax_exemption_id": "",
            "tax_exemption_code": "",
            "stock_on_hand": 2,
            "has_attachment": false,
            "is_combo_product": false,
            "cf_category": "Monitor",
            "cf_maximum_retail_price_mrp": "0",
            "created_time": "2018-08-31T12:53:35+0530",
            "last_modified_time": "2018-12-13T21:01:59+0530",
            "track_serial_number": false
        },
        {
            "item_id": "519558000005612779",
            "name": "ADATA XPG GAMMIX D10 8GB DDR4 RAM 2666MHz for Desktop RAM",
            "image_document_id": "",
            "item_name": "ADATA XPG GAMMIX D10 8GB DDR4 RAM 2666MHz for Desktop RAM",
            "hsn_or_sac": "8473",
            "sku": "AX4U266638G16-SRG",
            "image_name": "",
            "status": "active",
            "source": "user",
            "is_linked_with_zohocrm": false,
            "zcrm_product_id": "",
            "description": "",
            "item_tax_preferences": [
                {
                    "tax_specification": "inter",
                    "tax_type": 0,
                    "tax_name": "IGST18",
                    "tax_percentage": 18,
                    "tax_id": "519558000000076071"
                },
                {
                    "tax_specification": "intra",
                    "tax_type": 2,
                    "tax_name": "GST18",
                    "tax_percentage": 18,
                    "tax_id": "519558000000076077"
                }
            ],
            "rate": 4999,
            "tax_id": "",
            "reorder_level": "",
            "tax_name": "",
            "tax_percentage": 0,
            "purchase_account_id": "519558000000043003",
            "purchase_account_name": "Cost of Goods Sold",
            "account_name": "Sales",
            "unit": "Unit",
            "purchase_description": "",
            "purchase_rate": 3100,
            "item_type": "inventory",
            "product_type": "goods",
            "is_taxable": true,
            "tax_exemption_id": "",
            "tax_exemption_code": "",
            "stock_on_hand": 2,
            "has_attachment": false,
            "is_combo_product": false,
            "cf_category": "RAM",
            "cf_maximum_retail_price_mrp": "14999",
            "created_time": "2019-03-01T18:06:05+0530",
            "last_modified_time": "2019-04-27T17:08:53+0530",
            "track_serial_number": false
        }
    ],
    "page_context": {
        "page": 1,
        "per_page": 200,
        "has_more_page": true,
        "report_name": "Items",
        "applied_filter": "Status.All",
        "custom_fields": [],
        "sort_column": "name",
        "sort_order": "A"
    }
}

提供的JSON的输出必须反序列化为C＃对象并存储到数组中。

Answer 1

您需要提供一个RootObject类，该类具有用于Code，Message和Items的属性。

然后您反序列化到根对象，并访问items数组。

Answer 2

您必须在代码中添加此根类：

    public class Root
    {
        public string code { get; set; }
        public string message { get; set; }
        public Item[] items { get; set; }
    }

然后在您现有的 Item 类中添加或删除所需的属性。例如，在输入JSON中，有比类更多的属性，如果需要更多属性，只需在Item类中添加它们即可。我使用了您提供的课程。

然后您执行以下操作：

var inputObj = JsonConvert.DeserializeObject<Root>(json);

您需要以下NuGet软件包：Newtonsoft.Json
json 是包含您提供的整个JSON的字符串变量。请注意，在您提供的json中，末尾缺少“}”。

inputObj 是Root类类型的对象，并且包含所有项目的数组。例如inputObj.items

如果您需要更多帮助，请在下面评论。

欢呼

Answer 3

您的模型将像这样尝试

public class ItemTaxPreference
{
    public string tax_specification { get; set; }
    public int tax_type { get; set; }
    public string tax_name { get; set; }
    public int tax_percentage { get; set; }
    public string tax_id { get; set; }
}

public class Item
{
    public string item_id { get; set; }
    public string name { get; set; }
    public string image_document_id { get; set; }
    public string item_name { get; set; }
    public string hsn_or_sac { get; set; }
    public string sku { get; set; }
    public string image_name { get; set; }
    public string status { get; set; }
    public string source { get; set; }
    public bool is_linked_with_zohocrm { get; set; }
    public string zcrm_product_id { get; set; }
    public string description { get; set; }
    public List<ItemTaxPreference> item_tax_preferences { get; set; }
    public double rate { get; set; }
    public string tax_id { get; set; }
    public string reorder_level { get; set; }
    public string tax_name { get; set; }
    public int tax_percentage { get; set; }
    public string purchase_account_id { get; set; }
    public string purchase_account_name { get; set; }
    public string account_name { get; set; }
    public string unit { get; set; }
    public string purchase_description { get; set; }
    public int purchase_rate { get; set; }
    public string item_type { get; set; }
    public string product_type { get; set; }
    public bool is_taxable { get; set; }
    public string tax_exemption_id { get; set; }
    public string tax_exemption_code { get; set; }
    public bool has_attachment { get; set; }
    public bool is_combo_product { get; set; }
    public DateTime created_time { get; set; }
    public DateTime last_modified_time { get; set; }
    public bool track_serial_number { get; set; }
    public int? stock_on_hand { get; set; }
    public string cf_category { get; set; }
    public string cf_maximum_retail_price_mrp { get; set; }
}

public class PageContext
{
    public int page { get; set; }
    public int per_page { get; set; }
    public bool has_more_page { get; set; }
    public string report_name { get; set; }
    public string applied_filter { get; set; }
    public List<object> custom_fields { get; set; }
    public string sort_column { get; set; }
    public string sort_order { get; set; }
}

public class RootObject
{
    public int code { get; set; }
    public string message { get; set; }
    public List<Item> items { get; set; }
    public PageContext page_context { get; set; }
}

Answer 4

之所以没有进行反序列化，是因为您没有正确添加根级对象。

我为您的JSON响应建模，并制作了POCO以适当的pascal大小写公共属性对其进行建模，如下所示：

143146152 143146 143146 143146 143146

下面是一个示例代码，可以正确地对其反序列化。

public class Product
{
    [JsonProperty("code")]
    public int Code { get; set; }

    [JsonProperty("message")]
    public string Message { get; set; }

    [JsonProperty("items")]
    public List<Item> Items { get; set; }

    [JsonProperty("page_context")]
    public PageContext PageContext { get; set; }
}

public class PageContext
{
    [JsonProperty("page")]
    public int Page { get; set; }

    [JsonProperty("per_page")]
    public int PerPage { get; set; }

    [JsonProperty("has_more_page")]
    public bool HasMorePage { get; set; }

    [JsonProperty("report_name")]
    public string ReportName { get; set; }

    [JsonProperty("applied_filter")]
    public string AppliedFilter { get; set; }

    [JsonProperty("custom_fields")]
    public object[] CustomFields { get; set; }

    [JsonProperty("sort_column")]
    public string SortColumn { get; set; }

    [JsonProperty("sort_order")]
    public string SortOrder { get; set; }
}

public class Item
{
    [JsonProperty("item_id")]
    public string ItemId { get; set; }

    [JsonProperty("name")]
    public string Name { get; set; }

    [JsonProperty("image_document_id")]
    public string ImageDocumentId { get; set; }

    [JsonProperty("item_name")]
    public string ItemName { get; set; }

    [JsonProperty("hsn_or_sac")]
    public string HsnOrSac { get; set; }

    [JsonProperty("sku")]
    public string SKU { get; set; }

    [JsonProperty("image_name")]
    public string ImageName { get; set; }

    [JsonProperty("status")]
    public string Status { get; set; }

    [JsonProperty("source")]
    public string Source { get; set; }

    [JsonProperty("is_linked_with_zohocrm")]
    public bool IsLinkedWithZohocrm { get; set; }

    [JsonProperty("zcrm_product_id")]
    public string ZcrmProductId { get; set; }

    [JsonProperty("description")]
    public string Description { get; set; }

    [JsonProperty("item_tax_preferences")]
    public ItemTaxPreference[] ItemTaxPreferences { get; set; }

    [JsonProperty("rate")]
    public float Rate { get; set; }

    [JsonProperty("tax_id")]
    public string TaxId { get; set; }

    [JsonProperty("reorder_level")]
    public string ReorderLevel { get; set; }

    [JsonProperty("tax_name")]
    public string TaxName { get; set; }

    [JsonProperty("tax_percentage")]
    public int TaxPercentage { get; set; }

    [JsonProperty("purchase_account_id")]
    public string PurchaseAccountId { get; set; }

    [JsonProperty("purchase_account_name")]
    public string PurchaseAccountName { get; set; }

    [JsonProperty("account_name")]
    public string AccountName { get; set; }

    [JsonProperty("unit")]
    public string Unit { get; set; }

    [JsonProperty("purchase_description")]
    public string PurchaseDescription { get; set; }

    [JsonProperty("purchase_rate")]
    public int PurchaseRate { get; set; }

    [JsonProperty("item_type")]
    public string ItemType { get; set; }

    [JsonProperty("product_type")]
    public string ProductType { get; set; }

    [JsonProperty("is_taxable")]
    public bool IsTaxable { get; set; }

    [JsonProperty("tax_exemption_id")]
    public string TaxExemptionId { get; set; }

    [JsonProperty("tax_exemption_code")]
    public string TaxExemptionCode { get; set; }

    [JsonProperty("has_attachment")]
    public bool HasAttachment { get; set; }

    [JsonProperty("is_combo_product")]
    public bool IsComboProduct { get; set; }

    [JsonProperty("created_time")]
    public DateTime CreatedTime { get; set; }

    [JsonProperty("last_modified_time")]
    public DateTime LastModifiedTime { get; set; }

    [JsonProperty("track_serial_number")]
    public bool TrackSerialNumber { get; set; }

    [JsonProperty("stock_on_hand")]
    public int StockOnHand { get; set; }

    [JsonProperty("cf_category")]
    public string CfCategory { get; set; }

    [JsonProperty("cf_maximum_retail_price_mrp")]
    public string CfMaximumRetailPriceMRP { get; set; }
}

public class ItemTaxPreference
{
    [JsonProperty("tax_specification")]
    public string TaxSpecification { get; set; }

    [JsonProperty("tax_type")]
    public int tax_type { get; set; }

    [JsonProperty("tax_name")]
    public string TaxName { get; set; }

    [JsonProperty("tax_percentage")]
    public int TaxPercentage { get; set; }

    [JsonProperty("tax_id")]
    public string TaxId { get; set; }
}

如何将JSON输出转换为c＃对象并将其存储到数组中

4 个答案: