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json - 从 .Net Core 3.0 中的 API 反序列化 JSON 流，使所有字段为空

问题描述

我有一个简单的 WPF / .Net Core 3.0 应用程序，它在 Web API 端点上执行 GET：

private HttpClient httpClient = new HttpClient();

private async Task GetClients()
{
    var serializer = new DataContractJsonSerializer(typeof(List<ClientGetDto>));
    var streamTask = httpClient.GetStreamAsync("https://mywebapp.com/api/Clients");
    List<ClientGetDto> clientDtos = serializer.ReadObject(await streamTask) as List<ClientGetDto>;
}

ClientGetDto 看起来像这样：

{
    public int Id { get; set; }
    public string ClientCode { get; set; }
    public string ApiUrl { get; set; }
    public string CompanyName { get; set; }
    public string FranchiseName { get; set; }
    public int? ProLicenses { get; set; }
    public int? LiteLicenses { get; set; }
    public int? ProSalesLicenses { get; set; }
    public int? LiteSalesLicenses { get; set; }
    public bool? IsActive { get; set; }
    public DateTime? StartOfAgreementDate { get; set; }
    public int? DebitOrderDay { get; set; }
    public DateTime? DebitOrderStartDate { get; set; }
    public decimal? ContractAmount { get; set; }
    public bool? DebitOrderFormReceived { get; set; }
    public bool? CancellationReceived { get; set; }
    public DateTime? CancellationDate { get; set; }
    public string CompanyRegNo { get; set; }
    public string DbUrl { get; set; }
    public string DbName { get; set; }
    public double? CloudStorageQuota { get; set; }
    public string Comments { get; set; }
    public int? FranchiseId { get; set; }
    public bool? IsTestDb { get; set; }
    public bool? IsGumtreeRegistered { get; set; }
    public int? FusionClientId { get; set; }
    public string CountryCode { get; set; }
}

API 返回的 JSON 是：

[
  {
    "id": 3,
    "clientCode": "cx0007",
    "apiUrl": "https://mywebapp/api",
    "companyName": "ACME Company",
    "franchiseName": "ACME Franchise",
    "proLicenses": 1,
    "liteLicenses": 0,
    "proSalesLicenses": 0,
    "liteSalesLicenses": 0,
    "isActive": true,
    "startOfAgreementDate": "2007-08-01T00:00:00",
    "debitOrderDay": 1,
    "debitOrderStartDate": "2012-03-01T00:00:00",
    "contractAmount": 695.00,
    "debitOrderFormReceived": true,
    "cancellationReceived": false,
    "cancellationDate": "2012-10-18T00:00:00",
    "companyRegNo": "",
    "dbUrl": "mydb.co.za",
    "dbName": "db1",
    "cloudStorageQuota": 5.0,
    "comments": null,
    "franchiseId": null,
    "isTestDb": false,
    "isGumtreeRegistered": false,
    "fusionClientId": null,
    "countryCode": "US"
  },
  ...
]

我的问题是代码正确地将 JSON 反序列化为 ClientGetDto 对象列表，但所有字段均为空。它不会抛出任何异常或任何东西。我试过用 [DataContract] 和 [DataMember] 装饰我的 ClientGetDto 模型，但没有区别（也不会，因为模型的字段名称与 JSON 数据中的字段名称完全相同）

有任何想法吗？

标签： jsonserializationdeserializationdotnet-httpclient.net-core-3.0

解决方案

您应该用 [JsonPropertyName("")] 标记每个属性，因为 json 区分大小写（我认为）。

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