我正在寻找一个伪造的仓库。

public class FooRepo {

    public FutureFoo<Foo> GetById(int id) {

        var foo = new Foo();
        return new FutureValue(foo);
    }

    public FutureQuery<Foo> GetByCategory(int categoryId) {

        var foos = new[] { new Foo(), new Foo() new Foo() };

        return  //what goes here?
    }

}


这样做的目的是编写与数据相关的测试,而不依赖于任何数据库连接。对于FutureValue<>类型,这确实非常简单,因为它提供了一个接受直接对象的构造函数。但是,FutureQuery<>的构造函数采用参数IQueryable query, Action loadAction

我可以忽略loadAction吗?

如:new FutureQuery<Foo>(foos.AsQueryable(), () => { });

或执行此操作的正确方法是什么?



强制解决方案:

(FutureQuery<Foo>) Activator.CreateInstance(typeof(FutureQuery<Foo>),
                   BindingFlags.NonPublic | BindingFlags.Instance, null,
                   new object[] { foos.AsQueryable(), null }, null);

最佳答案

取自FutureQueryBase.GetResult()

    /// <summary>
    /// Gets the result by invoking the <see cref="LoadAction"/> if not already loaded.
    /// </summary>
    /// <returns>
    /// An <see cref="T:System.Collections.Generic.IEnumerable`1"/> that can be used to iterate through the collection.
    /// </returns>
    protected virtual IEnumerable<T> GetResult()
    {
        if (IsLoaded)
            return _result;

        // no load action, run query directly
        if (LoadAction == null)
        {
            _isLoaded = true;
            _result = _query as IEnumerable<T>;
            return _result;
        }

        // invoke the load action on the datacontext
        // result will be set with a callback to SetResult
        LoadAction.Invoke();
        return _result ?? Enumerable.Empty<T>();
    }


除非要通过null显式更新_result,否则应为加载操作传递SetResult(ObjectContext, DbDataReader)

10-07 12:50