使用Moq模拟IDataRecord

Question

I am attempting to Mock an IDataRecord interface.

So far I have:

        var mockIDataRecord = new Mock<IDataRecord>();
        mockIDataRecord.SetupGet(c => c["id"]).Returns(7);
        var z = mockIDataRecord["id"];

But Visual Studio throws a compilation error on the last line of that:

Error 2 Cannot apply indexing with [] to an expression of type 'Moq.Mock <System.Data.IDataRecord>'

Any suggestions?

Answer 1

The error is what visual studio says. You are applying indexing to instance of Mock class, not its generic parameter ( IDataRecord in your case). Use Mock.Object Property that will return IDataRecord and apply indexing to it

var z = mockIDataRecord.Object["id"];

Answer 2

You have created a mock of an object (of type IDataRecord). However you are trying to access mockIDataRecord[id] which implies that mockIDataRecord is a collection (Array?).

The type mismatch is probably what is causing the error.

Can you try something like this instead (I haven't checked the syntax):

var mockIDataRecord = new Mock<IDataRecord[]>();