[英]Get json array from Web api into c#
I´m having a SQL
database and I want to get the SQL
values from a API
into c# code. 我有一个
SQL
数据库,我想将API
的SQL
值转换为c#代码。 The API
contains multiple rooms with room attributes, and each room have a Guid
as a id. API
包含多个具有房间属性的房间,每个房间都有一个Guid
作为id。
This code works but I only get one room out of this: 这段代码有效,但我只能得到一个房间:
string url = "https://api.booking.com/api/room/35bf3c4d-9b5b-40fd-bcf4-a4c2c6c564bc";
HttpClient client = new HttpClient();
string response = await client.GetStringAsync(url);
var data = JsonConvert.DeserializeObject<Class2>(response);
When i remove the id
(Guid) to get all rooms i get this error when i launch the application: 当我删除
id
(Guid)以获取所有房间时,我在启动应用程序时出现此错误:
Newtonsoft.Json.JsonSerializationException: 'Cannot deserialize the current JSON array (eg [1,2,3]) into type 'Class2' because the type requires a JSON object (eg {"name":"value"}) to deserialize correctly.
Newtonsoft.Json.JsonSerializationException:'无法将当前JSON数组(例如[1,2,3])反序列化为类型'Class2',因为该类型需要JSON对象(例如{“name”:“value”})才能正确反序列化。 To fix this error either change the JSON to a JSON object (eg {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (eg ICollection, IList) like List that can be deserialized from a JSON array.
要修复此错误,请将JSON更改为JSON对象(例如{“name”:“value”})或将反序列化类型更改为数组或实现集合接口的类型(例如ICollection,IList),例如List从JSON数组反序列化。 JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.
JsonArrayAttribute也可以添加到类型中以强制它从JSON数组反序列化。 Path '', line 1, position 1.'
路径'',第1行,第1位。'
This is the code without the Guid: 这是没有Guid的代码:
string url = "https://api.booking.com/api/room";
HttpClient client = new HttpClient();
string response = await client.GetStringAsync(url);
var data = JsonConvert.DeserializeObject<Class2>(response);
My question is in short terms "How can i get a json array from a api?". 我的问题是简短的说法“如何从api中获取json数组?”。
Thanks in advance! 提前致谢!
Edit: 编辑:
This is the code for class2: 这是class2的代码:
public class Class2
{
public string name { get; set; }
public string id { get; set; }
public int seats { get; set; }
public int? availableFrom { get; set; }
public int? availableTo { get; set; }
}
And this is a longer output from a room in the API
: 这是
API
房间的较长输出:
[
{
"name": "Rum 1",
"id": "a31d1fc8-df29-419c-8308-f8bc884b378e",
"seats": 10,
"availableFrom": null,
"availableTo": null
},
{
"name": "Rum 2",
"id": "7defd34d-222d-4980-b28f-e616e8b9003c",
"seats": 5,
"availableFrom": null,
"availableTo": null
},
{
"name": "Skrubben",
"id": "b20390ff-703b-4d80-8c2f-32c0f27158bc",
"seats": 5,
"availableFrom": 10,
"availableTo": 11
},
{
"name": "Hangaren",
"id": "b89cbacd-c738-477f-aff2-7f22c2b2cd5c",
"seats": 100,
"availableFrom": null,
"availableTo": null
},
{
"name": "Tv-rummet",
"id": "ea6a290f-209b-4ccb-91a4-65d82a674bad",
"seats": 10,
"availableFrom": null,
"availableTo": null
},
{
"name": "Projektor-rummet",
"id": "3136a56a-4a28-4939-aca8-806534c808f7",
"seats": 12,
"availableFrom": null,
"availableTo": null
},
{
"name": "Skolsalen",
"id": "05f73582-3734-453f-aeb3-36daf8884912",
"seats": 30,
"availableFrom": null,
"availableTo": null
}
]
As the error suggests, 正如错误所示,
You are deserializing an array into a class.
您正在将数组反序列化为类。 It will never work.
它永远不会奏效。 You need to deserialize it into either an array or a list using the below code snippet.
您需要使用下面的代码片段将其反序列化为数组或列表。
Try: 尝试:
var data = JsonConvert.DeserializeObject<List<Class2>>(response);
or 要么
var data = JsonConvert.DeserializeObject<Class2[]>(response);
and it will work fine. 它会工作正常。
EDIT 1: 编辑1:
foreach(var room in data)
{
string id = room.id;
string name = room.name;
// and so on
}
多个Class2对象必须使用List或Array类型来转换它们,你可以尝试JsonConvert.DeserializeObject<List<Class2>>(response)
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