无法反序列化 JSON 响应
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【中文标题】无法反序列化 JSON 响应【英文标题】：Unable to deserialize JSON response 【发布时间】：2021-05-14 23:21:43 【问题描述】：您好，我正在从 API 获取 XML 响应，我正在将该 XML 响应转换为 JSON，然后使用 C# 对象在数据库中摄取数据。在将该 XML 转换为 JSON 并反序列化该 JSON 后，我会遇到如下错误。
Newtonsoft.Json.JsonSerializationException: 'Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'AMZ_All_Orders_Datewise.Program+OrderItem'
because the type requires a JSON object (e.g. "name":"value") to deserialize correctly.
To fix this error either change the JSON to a JSON object (e.g. "name":"value") or
change the deserialized type to an array or a type that implements a collection interface
(e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. JsonArrayAttribute
can also be added to the type to force it to deserialize from a JSON array.
Path 'AmazonEnvelope.Message[116].Order.OrderItem', line 1, position 107783.'
用于将 XML 转换为 JSON 的代码如下
//Response from API is stored in xml variable
string xml = Response.Content;
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
string Jsontext = JsonConvert.SerializeXmlNode(doc);
XML 转换后的 JSON 响应存储在 Jsontext 变量中。现在使用 Newtonsoft JSON 包对 JSON 进行反序列化
Root_Orders_Data root_Orders_Data = JsonConvert.DeserializeObject<Root_Orders_Data>(Jsontext);
在执行上述行时，会引发上述错误。 请帮我解决一下这个。提出任何想法或任何更正。 XML 响应低于
<?xml version="1.0" encoding="UTF-8"?>
<AmazonEnvelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="amzn-envelope.xsd">
<Header>
<DocumentVersion>1.00</DocumentVersion>
</Header>
<MessageType>AllOrdersReport</MessageType>
<Message>
<Order>
<AmazonOrderID>407-4867592-2717133</AmazonOrderID>
<MerchantOrderID>407-4867592-2717133</MerchantOrderID>
<PurchaseDate>2021-01-03T18:29:44+00:00</PurchaseDate>
<LastUpdatedDate>2021-01-05T08:03:11+00:00</LastUpdatedDate>
<OrderStatus>Shipped</OrderStatus>
<SalesChannel>Amazon.in</SalesChannel>
<FulfillmentData>
<FulfillmentChannel>Amazon</FulfillmentChannel>
<ShipServiceLevel>Expedited</ShipServiceLevel>
<Address>
<City>PATNA</City>
<State>BIHAR</State>
<PostalCode>800020</PostalCode>
<Country>IN</Country>
</Address>
</FulfillmentData>
<IsBusinessOrder>false</IsBusinessOrder>
<IsSoldByAB>false</IsSoldByAB>
<OrderItem>
<AmazonOrderItemCode>65393459928915</AmazonOrderItemCode>
<ASIN>B07GMRJTS9</ASIN>
<SKU>CT4G4DFS8266-01</SKU>
<ItemStatus>Shipped</ItemStatus>
<ProductName>Crucial RAM 4GB DDR4 2666 MHz CL19 Desktop Memory CT4G4DFS8266</ProductName>
<Quantity>1</Quantity>
<ItemPrice>
<Component>
<Type>Principal</Type>
<Amount currency="INR">1450.0</Amount>
</Component>
<Component>
<Type>Shipping</Type>
<Amount currency="INR">40.0</Amount>
</Component>
</ItemPrice>
<Promotion>
<PromotionIDs>IN Core Free Shipping 2015/04/08 23-48-5-108</PromotionIDs>
<ShipPromotionDiscount>40.0</ShipPromotionDiscount>
</Promotion>
</OrderItem>
</Order>
</Message>
<Message>
<Order>
<AmazonOrderID>406-0676704-1460352</AmazonOrderID>
<MerchantOrderID>406-0676704-1460352</MerchantOrderID>
<PurchaseDate>2021-01-01T17:58:26+00:00</PurchaseDate>
<LastUpdatedDate>2021-01-02T07:27:17+00:00</LastUpdatedDate>
<OrderStatus>Shipped</OrderStatus>
<SalesChannel>Amazon.in</SalesChannel>
<FulfillmentData>
<FulfillmentChannel>Amazon</FulfillmentChannel>
<ShipServiceLevel>Expedited</ShipServiceLevel>
<Address>
<City>BENGALURU</City>
<State>KARNATAKA</State>
<PostalCode>560051</PostalCode>
<Country>IN</Country>
</Address>
</FulfillmentData>
<IsBusinessOrder>false</IsBusinessOrder>
<IsSoldByAB>false</IsSoldByAB>
<OrderItem>
<AmazonOrderItemCode>65883701062139</AmazonOrderItemCode>
<ASIN>B07Z87LXY1</ASIN>
<SKU>F4-3600C16D-16GTZRC</SKU>
<ItemStatus>Shipped</ItemStatus>
<ProductName>G.Skill F4-3600C16D-16GTZRC Trident Z RGB DDR4-3600MHz CL16-19-19-39 1.35V 16GB (2x8GB) Memory</ProductName>
<Quantity>1</Quantity>
<ItemPrice>
<Component>
<Type>Principal</Type>
<Amount currency="INR">11699.0</Amount>
</Component>
</ItemPrice>
</OrderItem>
<OrderItem>
<AmazonOrderItemCode>29991566012307</AmazonOrderItemCode>
<ASIN>B089XVWVZ9</ASIN>
<SKU>90MB1490-M0IAY0</SKU>
<ItemStatus>Shipped</ItemStatus>
<ProductName>ASUS TUF Gaming B550M-Plus AM4 PCIe 4.0 DDR4 (4600 O.C.) mATX Motherboard with 2.5Gb Ethernet WiFi 6 2X M.2 USB 3.2 Gen2 and Aura Sync RGB Support</ProductName>
<Quantity>1</Quantity>
<ItemPrice>
<Component>
<Type>Principal</Type>
<Amount currency="INR">15940.0</Amount>
</Component>
</ItemPrice>
</OrderItem>
</Order>
</Message>
<Message>
<Order>
<AmazonOrderID>171-4651818-8974757</AmazonOrderID>
<MerchantOrderID>171-4651818-8974757</MerchantOrderID>
<PurchaseDate>2021-01-01T17:54:10+00:00</PurchaseDate>
<LastUpdatedDate>2021-01-02T07:26:52+00:00</LastUpdatedDate>
<OrderStatus>Shipped</OrderStatus>
<SalesChannel>Amazon.in</SalesChannel>
<FulfillmentData>
<FulfillmentChannel>Amazon</FulfillmentChannel>
<ShipServiceLevel>Expedited</ShipServiceLevel>
<Address>
<City>Anantapur</City>
<State>ANDHRA PRADESH</State>
<PostalCode>515001</PostalCode>
<Country>IN</Country>
</Address>
</FulfillmentData>
<IsBusinessOrder>false</IsBusinessOrder>
<IsSoldByAB>false</IsSoldByAB>
<OrderItem>
<AmazonOrderItemCode>38919417111003</AmazonOrderItemCode>
<ASIN>B07HY3QWM7</ASIN>
<SKU>DTSWIVL/16GBIN</SKU>
<ItemStatus>Shipped</ItemStatus>
<ProductName>Kingston DataTraveler Swivl 16GB USB 3.0 Pen Drive (DTSWIVL/16GBIN)</ProductName>
<Quantity>1</Quantity>
<ItemPrice>
<Component>
<Type>Principal</Type>
<Amount currency="INR">399.0</Amount>
</Component>
</ItemPrice>
</OrderItem>
</Order>
</Message>
</AmazonEnvelope>
C# 对象在下面
public class Header
public string DocumentVersion get; set;
public class Address
public string City get; set;
public string State get; set;
public string PostalCode get; set;
public string Country get; set;
public class FulfillmentData
public string FulfillmentChannel get; set;
public string ShipServiceLevel get; set;
public Address Address get; set;
public class Amount
public string _currency get; set;
public string __text get; set;
public class Component
public string Type get; set;
public Amount Amount get; set;
public class ItemPrice
public List<Component> Component get; set;
public class Promotion
public string PromotionIDs get; set;
public string ShipPromotionDiscount get; set;
public class OrderItem
public string AmazonOrderItemCode get; set;
public string ASIN get; set;
public string SKU get; set;
public string ItemStatus get; set;
public string ProductName get; set;
public string Quantity get; set;
public ItemPrice ItemPrice get; set;
public Promotion Promotion get; set;
public string NumberOfItems get; set;
public class Order
public string AmazonOrderID get; set;
public string MerchantOrderID get; set;
public DateTime PurchaseDate get; set;
public DateTime LastUpdatedDate get; set;
public string OrderStatus get; set;
public string SalesChannel get; set;
public FulfillmentData FulfillmentData get; set;
public string IsBusinessOrder get; set;
public string IsSoldByAB get; set;
public List<OrderItem> OrderItem get; set;
public string FulfilledBy get; set;
public class Message
public Order Order get; set;
public class AmazonEnvelope
public Header Header get; set;
public string MessageType get; set;
public List<Message> Message get; set;
[JsonProperty("_xmlns:xsi")]
public string XmlnsXsi get; set;
[JsonProperty("_xsi:noNamespaceSchemaLocation")]
public string XsiNoNamespaceSchemaLocation get; set;
public class Root_Orders_Data
public AmazonEnvelope AmazonEnvelope get; set;
【问题讨论】：
问题出在Root_Orders_Data 和 Json 中。与AMZ_All_Orders_Datewise.Program+OrderItem 类型不匹配。更准确地说，反序列化器找到了一个 Json 数组 [1,2,3] 而不是一个对象。对于您的问题，我不明白您为什么提供 XML。以及 Xml 反序列化。
一个奇怪的问题，为什么不直接将 Xml 反序列化为对象？而不是做json步骤？ xmltocsharp.azurewebsites.net。如果你在 Visual Studio 中没有找到过去 XMl 的特殊课程。
这能回答你的问题吗？ How to deserialize xml to object
我无法将 XML 序列化为 C 语言，这会引发一些错误。
最终目标是什么？如果是在数据库中保存数据，JSON中不需要，c#对象中不需要。只需将 XML 按原样传递到数据库，在那里分解，然后保存在数据库中。你的数据库是什么？
【参考方案1】：
这是一个概念性的例子。
它涵盖了与您的 Order 和 OrderDetails 类似的一对多场景。
SQL
-- DDL and sample data population, start
USE tempdb;
GO
CREATE TABLE #orders (
OurOrderID INT IDENTITY PRIMARY KEY,
OrderID CHAR(5) NOT NULL,
CustomerID CHAR(5) NOT NULL,
OrderDate DATE NOT NULL,
EmployeeID INT NOT NULL
);
CREATE TABLE #details (
OrderDetailID INT IDENTITY,
OurOrderID INT NOT NULL FOREIGN KEY REFERENCES #orders(OurOrderID),
ProductID INT NOT NULL,
Price DECIMAL(10,2) NOT NULL,
Qty INT NOT NULL,
PRIMARY KEY (OrderDetailID, OurOrderID, ProductID)
);
DECLARE @orderidmap TABLE (
OurOrderID INT PRIMARY KEY,
TheirOrderID INT NOT NULL UNIQUE
);
DECLARE @xml XML =
N'<Orders>
<Order OrderID="13000" CustomerID="ALFKI" OrderDate="2006-09-20Z" EmployeeID="2">
<OrderDetails ProductID="76" Price="123" Qty="10"/>
<OrderDetails ProductID="16" Price="3.23" Qty="20"/>
</Order>
<Order OrderID="13001" CustomerID="VINET" OrderDate="2006-09-20Z" EmployeeID="1">
<OrderDetails ProductID="12" Price="12.23" Qty="1"/>
</Order>
</Orders>';
-- DDL and sample data population, end
/*
Propagate generated IDENTITY values for PRIMARY KEY as FOREIGN KEY in the child table
=============================================================================================
We have an XML document with order data, and there is an order ID in that data.
To be able to store both header and details, we need a mapping,
and to this end we use the MERGE statement with the odd condition 1 = 0
in the USING clause and there is only one branch for WHEN NOT MATCHED.
We use the OUTPUT clause, and we insert both order IDs into the @orderidmap table.
*/
;WITH OrderData AS
(
SELECT TheirOrderID = c.value('@OrderID[1]', 'INT'),
CustomerID = c.value('@CustomerID[1]', 'CHAR(5)'),
OrderDate = c.value('@OrderDate[1]', 'DATETIME'),
EmployeeID = c.value('@EmployeeID[1]', 'SMALLINT')
FROM @xml.nodes('/Orders/Order') AS t(c)
)
MERGE #orders AS o
USING OrderData AS od ON 1 = 0
WHEN NOT MATCHED THEN
INSERT(OrderID, CustomerID, OrderDate, EmployeeID)
VALUES(od.TheirOrderID, od.CustomerID, od.OrderDate, od.EmployeeID)
OUTPUT inserted.OurOrderID, od.TheirOrderID
INTO @orderidmap (OurOrderID, TheirOrderID);
;WITH Details AS
(
SELECT TheirOrderID = o.value('@OrderID[1]', 'INT'),
ProductID = od.value('@ProductID[1]', 'SMALLINT'),
Price = od.value('@Price[1]', 'DECIMAL(10,2)'),
Qty = od.value('@Qty[1]', 'INT')
FROM @xml.nodes('/Orders/Order') AS A(o)
CROSS APPLY A.o.nodes('OrderDetails') AS B(od)
)
INSERT #details (OurOrderID, ProductID, Price, Qty)
SELECT m.OurOrderID, d.ProductID, d.Price, d.Qty
FROM Details AS d
INNER JOIN @orderidmap AS m ON d.TheirOrderID = m.TheirOrderID;
-- test
SELECT * FROM #orders;
SELECT * FROM @orderidmap;
SELECT * FROM #details;
GO
DROP TABLE #orders, #details;
【讨论】：
谢谢。但我的要求是定期将 API 中的 XML 响应提取到数据库中。就像每次生病调用 API 时都会获取 XML 响应并将其摄取到数据库中。你能帮我解决这样的事情吗？ @Abdul，只需将我向您展示的内容打包为存储过程。并从应用程序中调用它，方法是根据需要多次将 XML 参数传递给它。以上是关于无法反序列化 JSON 响应的主要内容，如果未能解决你的问题，请参考以下文章