Question

我很难搞清楚这一点。那里的例子没有使用异步调用。

如何通过id对单个对象进行get调用时使用Include？

我是否需要摆脱异步调用？我需要包含匹配的

ExerciseRepetitions && ExerciseImages

另外我怎么能添加

.Where(k => k.IsHidden != true)

每个儿童模特？

[Route("")]
public IQueryable<Exercise> GetExercises()
{
    var result = db.Exercises
        .Include(c => c.ExerciseRepetitions)
        .Include(o => o.ExerciseImages)
        .Where(k => k.IsHidden != true);
    return result;
}

// GET: api/Exercises/5
[Route("{id:int}")]
[ResponseType(typeof(Exercise))]
public async Task<IHttpActionResult> GetExercise(int id)
{
    Exercise exercise = await db.Exercises.FindAsync(id);

       ///// I need this call to return ExerciseRepetitions &&  ExerciseImages  as nested arrays. Also I need to filter out any object that has  IsHidden = true.

    if (exercise == null)
    {
        return NotFound();
    }

    return Ok(exercise);
}

Answer 1

您无法通过Include扩展程序过滤实体。

您可以通过显式加载集合属性来执行以下操作。显式加载允许您过滤您正在加载的集合，如下所示：

if(exercise != null)
{
    await db.Entry(exercise)
             .Collection(p => p.ExerciseRepetitions)
             .Query()
             .Where(p => !p.IsHidden)
             .LoadAsync();

    await db.Entry(exercise)
             .Collection(p => p.ExerciseImages)
             .Query()
             .Where(p => !p.IsHidden)
             .LoadAsync();
}

如何使用Entity Framework包含子属性

1 个答案: