如何反序列化azure devOps的json响应

Question

我将问题提交给Microsoft文档。我请求azure devOps api检索特定组织和项目中托管的所有repo。响应是一个json，如下所示：

{
"count": 3,
"value": [
{
"id": "5febef5a-833d-4e14-b9c0-14cb638f91e6",
"name": "AnotherRepository",
"url": "https://dev.azure.com/fabrikam/_apis/git/repositories/5febef5a-833d-4e14-b9c0-14cb638f91e6",
"project": {
"id": "6ce954b1-ce1f-45d1-b94d-e6bf2464ba2c",
"name": "Fabrikam-Fiber-Git",
"url": "https://dev.azure.com/fabrikam/_apis/projects/6ce954b1-ce1f-45d1-b94d-e6bf2464ba2c",
"state": "wellFormed"
},
"remoteUrl": "https://dev.azure.com/fabrikam/Fabrikam-Fiber-Git/_git/AnotherRepository"
},
{
"id": "278d5cd2-584d-4b63-824a-2ba458937249",
"name": "Fabrikam-Fiber-Git",
"url": "https://dev.azure.com/fabrikam/_apis/git/repositories/278d5cd2-584d-4b63-824a-2ba458937249",
"project": {
"id": "6ce954b1-ce1f-45d1-b94d-e6bf2464ba2c",
"name": "Fabrikam-Fiber-Git",
"url": "https://dev.azure.com/fabrikam/_apis/projects/6ce954b1-ce1f-45d1-b94d-e6bf2464ba2c",
"state": "wellFormed"
},
"defaultBranch": "refs/heads/master",
"remoteUrl": "https://dev.azure.com/fabrikam/_git/Fabrikam-Fiber-Git"
},
{
"id": "66efb083-777a-4cac-a350-a24b046be6be",
"name": "TestGit",
"url": "https://dev.azure.com/fabrikam/_apis/git/repositories/66efb083-777a-4cac-a350-a24b046be6be",
"project": {
"id": "281f9a5b-af0d-49b4-a1df-fe6f5e5f84d0",
"name": "TestGit",
"url": "https://dev.azure.com/fabrikam/_apis/projects/281f9a5b-af0d-49b4-a1df-fe6f5e5f84d0",
"state": "wellFormed"
},
"defaultBranch": "refs/heads/master",
"remoteUrl": "https://dev.azure.com/fabrikam/_git/TestGit"
}
]
}

Microsoft文档说api返回类型GitRepository[]，所以我想将json反序列化为该类型，但我该怎么做呢？？

由于count和value属性，我构建了一个HelperClass，如下所示：

public class Rootobject
{
public GitRepository[] value { get; set; }
public int count { get; set; }
}

但在反序列化并转换到该对象之后，GitRepository的所有道具都为null。

有人能帮我为什么所有属性都为空吗？？

编辑：这是反序列化

static async Task Main(string[] args)
{
string accessToken = "personal_access_token";
HttpClient httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", string.Empty, accessToken))));
var response = await httpClient.GetStringAsync("https://dev.azure.com/fabrikam/_apis/git/repositories?api-version=5.1");
var responseObject = JsonSerializer.Deserialize<Rootobject>(response);
Console.WriteLine();
}

Answer 1

您是如何进行反序列化的？您在哪里定义了GitRepository类？您是否尝试过反序列化为字符串以检查是否有任何成员发生了更改？文件来自2016年，此后可能发生了变化。

您可以使用Microsoft提供的nuget包来访问这些API：https://learn.microsoft.com/en-us/azure/devops/integrate/concepts/dotnet-client-libraries?view=azure-devops

我认为您需要的NuGet包是Microsoft.TeamFoundationServer.Client

Answer 2

问题是System.Text.Json.JsonSerializer默认情况下区分大小写。GitRepository属性名称是PascalCase，而您提供的json示例包含CamelCase名称。因此JsonSerializer无法正确地反序列化这些属性。

您可以通过提供JsonSerializerOptions:来覆盖默认设置

var responseObject = JsonSerializer.Deserialize<Rootobject>(response, new JsonSerializerOptions
{
PropertyNameCaseInsensitive = true
});

我还注意到project属性仍然没有被反序列化。我想这是因为GitRepository有一个名为ProjectReference(而不是Project(的属性，并且有一个DataMember属性。

看起来System.Text.Json不尊重DataMember属性。所以我建议您使用Newtonsoft.Json库。我测试了它，它运行良好：

var responseObject = Newtonsoft.Json.JsonConvert.DeserializeObject<Rootobject>(response);