模拟表达式参数到存储库方法

时间:2015-08-31 07:23:50

标签: c# moq repository-pattern

使用Moq。我有一个包含以下界面的存储库:

public virtual IEnumerable<TEntity> GetBySpec(ISpecification<TEntity> specification, params string[] includes)
{
        IQueryable<TEntity> query = includes.Aggregate<string, IQueryable<TEntity>>(_dbSetQuery, (current, include) => current.Include(include));

        return query.Where(specification.SatisfiedBy())
                                 .AsEnumerable<TEntity>();
}

在这种情况下,我正在使用DirectSpecification:

public sealed class DirectSpecification<TEntity> : Specification<TEntity>
{
    Expression<Func<TEntity, bool>> _MatchingCriteria;

    public DirectSpecification(Expression<Func<TEntity, bool>> matchingCriteria)
    {
        _MatchingCriteria = matchingCriteria;
    }

    public override Expression<Func<TEntity, bool>> SatisfiedBy()
    {
        return _MatchingCriteria;
    }
}

在我的实际代码中,我正在调用

var recentlyChanged = _vwPersonRepository.GetBySpec(
               new DirectSpecification<vwPerson>(person =>
                   person.ModifiedDate > modifiedFromDay &&
                   person.ModifiedDate < modifiedTo));

var recentlyCreated = _vwPersonRepository.GetBySpec(
               new DirectSpecification<vwPerson>(person =>
                   person.CreatedDate > createdFromDay &&
                   person.CreatedDate < createdTo));

编辑:根据重复建议,我试过了这个:

        Container.GetMock<IvwPersonRepository>()
            .Setup(p => p.GetBySpec(It.IsAny<ISpecification<vwPerson>>()))                        
            .Returns((Expression<Func<vwPerson, bool>> predicate) => 
              items.Where(predicate));

我得到了

Exception thrown: 'System.Reflection.TargetParameterCountException' in mscorlib.dll

Additional information: Parameter count mismatch.

通过使用ISpecification参数我的问题很复杂,我如何获得正确的参数以便我可以使用谓词?

编辑2:感谢Patrick,这是解决方案:

        Container.GetMock<IvwPersonRepository>()
            .Setup(p => p.GetBySpec(It.IsAny<ISpecification<vwPerson>>(), It.IsAny<string[]>()))                        
            .Returns((ISpecification<vwPerson> specification, string[] includes) => 
              items.Where(predicate));

他们的关键是要包含string[] includes,即使我没有将它作为参数传递给反射找到它并期望它在那里。

辉煌!

1 个答案:

答案 0 :(得分:2)

编辑中的Setup来电是错误的,应该是:

Container.GetMock<IvwPersonRepository>()
         .Setup(p => p.GetBySpec(It.IsAny<ISpecification<vwPerson>>()))
         .Returns((ISpecification<vwPerson> specification) => /* TODO */);

(这是因为传递给Returns的参数是传递给正在设置的函数的参数,在本例中为GetBySpec。)

我相信(基于你发布的内容)你可以这样做:

Container.GetMock<IvwPersonRepository>()
         .Setup(p => p.GetBySpec(It.IsAny<ISpecification<vwPerson>>()))
         .Returns((ISpecification<vwPerson> specification) => items.Where(specification.SatisfiedBy()));

但是,您可能会看到使用工厂创建规范的一些好处,以便您可以模拟它们以避免依赖它们的实现(在上面的SatisfiedBy调用中)。