Moq DbSet NotImplementedException [英] Moq DbSet NotImplementedException

问题描述

我有一个Moq DbSet，直到最近一直在使用，但是自从上次更新依赖项以来，它一直在IQueryable.Provider

上抛出NotImplementedException

代码使用如下:

var mockSet = new Mock<DbSet<A>>();
var list = new List<A>();
var queryable = list.AsQueryable();
mockSet.As<IQueryable<A>>().Setup(m => m.Provider).Returns(queryable.Provider);
mockSet.As<IQueryable<A>>().Setup(m => m.Expression).Returns(queryable.Expression);
mockSet.As<IQueryable<A>>().Setup(m => m.ElementType).Returns(queryable.ElementType);
mockSet.As<IQueryable<A>>().Setup(m => m.GetEnumerator()).Returns(() => queryable.GetEnumerator());

var f =mockSet.Object.FirstOrDefault(); // NotImplementedException thrown here

引发的异常如下:

System.NotImplementedException
The member 'IQueryable.Provider' has not been implemented on type
'DbSet`1Proxy_1' which inherits from 'DbSet`1'.
Test doubles for 'DbSet`1' must provide implementations of methods
and properties that are used.

解决方案

可能是您一直在使用Moq的4.7.58版本.该特定版本受回归的影响触发了这样的NotImplementedException.在版本4.7.63中，修复了 的问题，因此，建议您将Moq软件包参考更新为4.7.63版或更高版本，以解决此问题.

您的代码本可以在4.7.58之前的Moq版本中工作的事实是由于功能"，不幸的是，这导致了比解决的问题多得多的问题.因此，该功能已恢复... >

Moq已恢复到其原始行为，在这种情况下，您需要通过mock.As<TInterface> 之前调用mock.Object 设置各种接口成员. . (通常，在Moq中，即使在检索了模拟对象之后执行更多设置也是完全可以的；这种情况是一个明显的例外.希望可以在Moq的未来版本中进行修复.)

I have a Moq DbSet that has been working until recently, however since the last update of dependencies it keeps throwing a NotImplementedException on IQueryable.Provider

Code used as follows:

var mockSet = new Mock<DbSet<A>>();
var list = new List<A>();
var queryable = list.AsQueryable();
mockSet.As<IQueryable<A>>().Setup(m => m.Provider).Returns(queryable.Provider);
mockSet.As<IQueryable<A>>().Setup(m => m.Expression).Returns(queryable.Expression);
mockSet.As<IQueryable<A>>().Setup(m => m.ElementType).Returns(queryable.ElementType);
mockSet.As<IQueryable<A>>().Setup(m => m.GetEnumerator()).Returns(() => queryable.GetEnumerator());

var f =mockSet.Object.FirstOrDefault(); // NotImplementedException thrown here

The exception thrown as follows:

System.NotImplementedException
The member 'IQueryable.Provider' has not been implemented on type
'DbSet`1Proxy_1' which inherits from 'DbSet`1'.
Test doubles for 'DbSet`1' must provide implementations of methods
and properties that are used.

解决方案

Chances are that you have been using version 4.7.58 of Moq. That particular version was affected by a regression that would have triggered such a NotImplementedException. That regression has been fixed in version 4.7.63, so I suggest you update your Moq package reference to version 4.7.63 or newer to resolve this issue.

The fact that your code would have worked in Moq versions before 4.7.58 was due to a "feature" which unfortunately caused a lot more problems than it solved. For this reason, that feature was reverted.

Moq has been brought back to its original behaviour, where, in this particular scenario, you need to set up the various interface members via mock.As<TInterface> before the call to mock.Object. (Usually, in Moq, it's perfectly fine to perform more set ups even after retrieving the mock object; this scenario is a notable exception. Hopefully this can be fixed in a future version of Moq.)

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