0

这是我的模型：

锻炼：

 public class Exercise
    {


        public int ExerciseId { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }
}

肌肉：

public class Muscle
    {


        public int MuscleId { get; set; }

        public string Name { get; set; }
}

锻炼和肌肉

公共类ExercisesAndMuscles {#region 属性

    public int Id { get; set; }

    //each exercise hits muslce by some percentage
    public int PercentageByWhichMuscleIsHit { get; set; }

    #endregion

    #region Navigational properties

    public int MuscleId { get; set; }
    public virtual Muscle Muscle { get; set; }


    public int ExerciseId { get; set; }
    public virtual Exercise Exercise { get; set; }

    #endregion
}

这是 FluentApi 配置：

modelBuilder.Entity<ExercisesAndMuscles>()
                .HasRequired(e => e.Exercise)
                .WithMany()
                .HasForeignKey(e => e.ExerciseId)
                .WillCascadeOnDelete(false);

            modelBuilder.Entity<ExercisesAndMuscles>()
                .HasRequired(m => m.Muscle)
                .WithMany()
                .HasForeignKey(m => m.MuscleId)
                .WillCascadeOnDelete(false);

我在 TestDatabaseContext 添加了这两行

Configuration.LazyLoadingEnabled = false;
Configuration.ProxyCreationEnabled = false;

这是我的 WebApi

public class ExerciseAndMuscleController : ApiController
    {
        readonly TestDatabaseContext _databaseContext = new TestDatabaseContext ();
        // GET api/<controller>
        public IQueryable<ExercisesAndMuscles> Get()
        {
            return _databaseContext.ExercisesAndMuscleses.Include( m => m.Exercise).AsQueryable();
        }
}

当我尝试这样查询时：

http://localhost:23758/api/ExerciseAndMuscle?$expand=Exercise

我收到这些错误：

{"$id":"1","$type":"System.Web.Http.HttpError, System.Web.Http","Message":"An error has occurred.","ExceptionMessage":"'object' does not contain a definition for 'Include'","ExceptionType":"Microsoft.CSharp.RuntimeBinder.RuntimeBinderException","StackTrace":"   at System.Web.Http.ApiController.<InvokeActionWithExceptionFilters>d__b.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__0.MoveNext()"}

并且没有包含和启用延迟加载的错误是相同的。

4

1 回答 1

2

让你的方法是这样的：

[Queryable(AllowedQueryOptions= AllowedQueryOptions.Supported | AllowedQueryOptions.Expand)]
public IQueryable<ExercisesAndMuscles> Get()
{
        return _databaseContext.ExercisesAndMuscleses;
}

Web API 应该可以翻译扩展，当然 Web API 只支持在 nightly builds 中扩展。

于 2013-08-04T21:03:05.953 回答