我有一个使用Web API的WPF / .Net Core 3.0应用程序。 它在API端点上执行GET，然后尝试反序列化JSON。 但是，尝试反序列化DateTime字段时给出错误。 这是代码：

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模型如下：

{
    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"
  },...
]

我得到的错误是：

  

“反序列化类型的对象时发生错误   System.Collections.Generic.List`1 [[PropWorxManager.DTOs.ClientGetDto，   PropWorxManager，版本= 1.0.0.0，文化=中性，   PublicKeyToken = null]]。   DateTime内容“ 2007-08-01T00：00：00”没有   根据需要，以'\ / Date（'开头，以'）\ /'结尾   JSON。“} System.Runtime.Serialization.SerializationException

经过一些研究，我尝试了这一点：

var settings = new DataContractJsonSerializerSettings
{
    DateTimeFormat = new System.Runtime.Serialization.DateTimeFormat("o")
};
var serializer = new DataContractJsonSerializer(typeof(List<ClientGetDto>),settings);

但这会导致此错误：

  

“反序列化类型的对象时发生错误   System.Collections.Generic.List`1 [[PropWorxManager.DTOs.ClientGetDto，   PropWorxManager，版本= 1.0.0.0，文化=中性，   PublicKeyToken = null]]。   字符串'2007-08-01T00：00：00'无法识别   作为有效   DateTime。“} System.Runtime.Serialization.SerializationException

任何建议都将受到欢迎。谢谢。

P.S。如果有帮助，该API也是用.Net Core 3.0编写的。