web api没有返回所有对象

Question

我的web api控制器中有一个方法，如下所示：

// GET api/categories/top
[HttpGet]
[Route("api/categories/top")]
public IHttpActionResult Top()
{
    var models = service.GetRoot("Categories", "Assets").Categories;
    var t = models.Where(model => !model.Deleted);

    return Ok(t);
}

如果我运行它，我会得到第一个项目，但其他项目显示为

{"$ref":"3"},{"$ref":"13"},{"$ref":"14"},{"$ref":"15"}

如果我将代码更改为：

// GET api/categories/top
[HttpGet]
[Route("api/categories/top")]
public IHttpActionResult Top()
{
    var models = service.GetRoot("Categories", "Assets").Categories;

    return Ok(models);
}

它工作正常（但这显示所有类别，包括已删除的类别，这不是我想要的）。

有谁知道为什么会这样？

Answer 1

怎么样？

var models = service.GetRoot("Categories", "Assets").Categories;
var t = models.Where(model => !model.Deleted).ToList();
return Ok(t);

我希望返回一个未执行的IEnumerable对象时出现问题。

Answer 2

以下是相同

的一个非常简单的示例

类

public class Employee
{
    public string Name { get; set; }
    public bool Deleted { get; set; }
}

样本数据

var employees = new List<Employee>();
employees.Add(new Employee{ Name = "Yasser", Deleted = false });
employees.Add(new Employee{ Name = "Hanselman", Deleted = true });
employees.Add(new Employee{ Name = "Neel", Deleted = true });
employees.Add(new Employee{ Name = "Ian", Deleted = false });

返回“未删除”列表

return employees.Where(model => !model.Deleted).ToList();

代码中所需的更改：

// GET api/categories/top
[HttpGet]
[Route("api/categories/top")]
public IHttpActionResult Top()
{
    var models = service.GetRoot("Categories", "Assets").Categories;
    var t = models.Where(model => !model.Deleted).ToList();
    return Ok(t);
}