JSON响应不包括所有项。-JSONresponsedoesnotincludeallitems

1  

As Kiran pointed out, you have circular references in your models, which is causing an exception. This bug is incorrectly making it look like the request is completing with partial data. (The circular reference is Category -> Tasks -> Task -> Category)

正如Kiran所指出的，您的模型中有循环引用，这会导致异常。这个错误使它看起来像请求用部分数据完成。(循环引用为Category -> Tasks -> Task -> Category)

What's actually happening is an unhandled exception halfway through the JSON serialization of the response. Instead of aborting the connection (as it should), ASP.NET Core is sending back everything that was serialized until the error occurred.

实际上，在响应的JSON序列化过程中出现了一个未处理的异常。而不是像应该的那样中止连接，而是ASP。NET Core将发送被序列化的所有内容，直到发生错误。

You can either define a DTO class that doesn't include the reference from Task back to Category, or return an anonymous type:

您可以定义一个不包含从任务返回到类别的引用的DTO类，或者返回一个匿名类型:

[HttpGet]
public JsonResult Get()
{
    var result = _repo.GetAllForUser("lucas@test.com");

    var respOnse= new {
        categoryId: result.CategoryId,
        name: result.Name,
        timestamp: result.Timestamp,
        username: result.Username,
        tasks: result.Tasks.Select(t => new {
            taskId: t.TaskId,
            name: t.Name,
            timestamp: t.Timestamp
        })
    };

    return Json(response);
}

If you do this often, it makes sense to create DTO class and use a tool like AutoMapper to do the mapping for you.

如果您经常这样做，那么创建DTO类并使用AutoMapper之类的工具为您完成映射是有意义的。

0  

Nate's answer is perfect, he responded with great recommendations that pointed me to find great solution for my scenario. I have decided to share it in case someone would run into similar problem. As a reminder, this is ASP.NET Core Model First MVC project with Api. I have utilized AutoMapper for mapping my Model First classes with corresponding view models.

内特的回答是完美的，他的回答非常棒，他建议我为我的设想找到一个很好的解决方案。我决定分享它，以防有人遇到类似的问题。作为提醒，这是ASP。NET核心模型第一个使用Api的MVC项目。我使用AutoMapper将我的模型第一个类与相应的视图模型映射。

Here are my Model First classes:

这是我的模型第一课:

public class Category
{
    public Category()
    {
        Tasks = new HashSet();
    }

    public int CategoryId { get; set; }
    public string Name { get; set; }
    public DateTime Timestamp { get; set; }
    public string Username { get; set; }

    public ApplicationUser ApplicationUser { get; set; }

    public virtual ICollection Tasks { get; set; }
}

public class Task
{
    public int TaskId { get; set; }
    public string Name { get; set; }
    public DateTime Timestamp { get; set; }
    public int CategoryId { get; set; }

    public virtual Category Category { get; set; }
}

Corresponding view models:

相应的视图模型:

public class CategoryViewModel
{
    public int CategoryId { get; set; }
    public string Name { get; set; }
    public DateTime Timestamp { get; set; }

    public IEnumerable Tasks { get; set; }
}

public class TaskViewModel
{
    public int TaskId { get; set; }
    public string Name { get; set; }
    public DateTime Timestamp { get; set; }
}

AutoMapper setup in 'Setup.cs' file:

AutoMapper设置”设置。cs的文件:

Mapper.Initialize(cOnfig=>
        {
            config.CreateMap().ReverseMap();
            config.CreateMap().ReverseMap();
        });

And finally my fully working Api method:

最后，我的全工作Api方法:

[HttpGet]
    public JsonResult Get()
    {
        var result = Mapper.Map>(_repo.GetAllForUser("lucas@test.com"));

        return Json(result);
    }