JsonSerializer.DeserializeAsync<T> 不反序列化

Question

我正在使用我的第一个 Blazor 应用程序并遇到一个奇怪的问题。我有一个 Web API，它返回一个相当基本的 JSON 响应：

{
    "entityId": 26,
    "notifications": [
        {
            "type": "Success",
            "message": "The operation completed successfully."
        }
    ],
    "hasErrors": false,
    "hasWarnings": false
}

有一个标准的 POCO 类与上述属性相匹配。从 Blazor 应用程序中，当我尝试从 an 获取响应时Http.PutAsJsonAsync<T>，会创建 POCO 类的实例（因此它不为 null 并且不会引发错误），但上述值实际上都不存在。该EntityId属性为 null 并且Notifications已实例化但为空。我尝试访问响应的方式是：

var result = await Http.PutAsJsonAsync<ManufacturerModel>($"manufacturers", (ManufacturerModel)context.Model);
if (result.IsSuccessStatusCode)
{
  var response = await JsonSerializer.DeserializeAsync<EntityResponseModel>(result.Content.ReadAsStream());
    
  //response isn't null - it's just a newly created object with nothing mapped
}

通过 Chrome 中的控制台，我已经确认返回了正确的 JSON，所以它真的很令人困惑为什么它会创建该类的新实例，但不映射任何值。

有任何想法吗？

**** 编辑 - 包括 POCO 定义 ****

public class EntityResponseModel : BaseModel
{
    /// <summary>
    /// Gets or sets the Id of the affected entity
    /// </summary>
    public long? EntityId { get; set; }
}

public class BaseModel
{
    public BaseModel()
    {
        this.Notifications = new EntityNotificationCollection();
    }

    #region Validation

    /// <summary>
    /// Adds a notification to this model.
    /// </summary>
    /// <param name="type">The type of notification</param>
    /// <param name="message">The message to display</param>
    public void AddNotification(EntityNotificationTypes type, string message)
    {
        this.Notifications.Add(new EntityNotification { Type = type, Message = message });
    }

    /// <summary>
    /// Gets or sets the collection of notifications
    /// </summary>
    public EntityNotificationCollection Notifications { get; private set; }

    /// <summary>
    /// Gets whether errors exist on this model.
    /// </summary>
    //[JsonIgnore]
    public bool HasErrors { get => this.Notifications.HasErrors; }

    /// <summary>
    /// Gets whether warnings exist on this model
    /// </summary>
    //[JsonIgnore]
    public bool HasWarnings { get => this.Notifications.HasWarnings; }

    #endregion
}

Answer 1

您可以指定序列化设置并将其定义为区分大小写或不区分大小写。CharlieFace 在上面提供了这个答案。

看起来您需要添加 JsonAttribute 来管理大小写敏感性。

var options = new JsonSerializerOptions
{
    PropertyNameCaseInsensitive = true,
};

Answer 2

这是我的完整解决方案：

var retList = new List<PocoSomeClassData> (); 
var response = await client.GetAsync(uri); 
if (response.IsSuccessStatusCode) {
        using (var reponseStream = await response.Content.ReadAsStreamAsync())
        {
            var options = new JsonSerializerOptions
            {
                PropertyNameCaseInsensitive = true,
            };
            retList = await JsonSerializer.DeserializeAsync < List<PocoSomeClassData> > (reponseStream,options);
        } 
}