我有一个Generic存储库,并且正在尝试将.Returns转换为Expression但它拒绝...我的代码如下:
public RepositoryTest()
{
IList<MockObjectSet> mocks = new List<MockObjectSet>()
{
new MockObjectSet { FirstName = "Beta", LastName = "Alpha", Mobile = 12345678 },
new MockObjectSet { FirstName = "Alpha", LastName = "Beta", Mobile = 87654321 }
};
var mockRepository = new Mock<IRepository<MockObjectSet>>();
mockRepository.Setup(x => x.GetBy(It.IsAny<Expression<Func<MockObjectSet, bool>>>()))
.Returns((Expression<Func<MockObjectSet, bool>> predicate) => mocks.Where(predicate).ToList());
}
它只是说
Delegate System.Func<System.Collections.Generic.IEnumerable<expWEBCRM.Tests.Repositories.MockObjectSet>> does not take 1 arguments
提前致谢!
答案 0 :(得分:4)
您需要明确指定Returns
重载的类型参数,如下所示:
mockRepository.Setup(x => x.GetBy(It.IsAny<Expression<Func<MockObjectSet, bool>>>()))
.Returns<Expression<Func<MockObjectSet, bool>>>(predicate => mocks.Where(predicate).ToList());
编辑存储库采用表达式并在IQueryable
上使用它。模拟数据源实际上是IEnumerable
。 LINQ接口的区别在于需要一个lambda,一个表达式:
IQueryable<T>.Where(Expression<Func<T,bool>>);
IEnumerable<T>.Where(Func<T,bool>);
此方案中发生的情况是尝试使用IEnumerable.Where
致电Expression<Func<T,bool>>
。解决此问题的最简单方法是将源集合设为IQueryable
:
public RepositoryTest()
{
IQueryable<MockObjectSet> mocks = new List<MockObjectSet>()
{
new MockObjectSet { FirstName = "Beta", LastName = "Alpha", Mobile = 12345678 },
new MockObjectSet { FirstName = "Alpha", LastName = "Beta", Mobile = 87654321 }
}.AsQueryable();
var mockRepository = new Mock<IRepository<MockObjectSet>>();
mockRepository.Setup(x => x.GetBy(It.IsAny<Expression<Func<MockObjectSet, bool>>>()))
.Returns<Expression<Func<MockObjectSet, bool>>>(predicate => mocks.Where(predicate).ToList());
}