ProjectTo ConstructUsing

[r-ising]

Hello,

we create a wrong mapping like this:

c.CreateMap<DateTime?, DateOnly?>().ConstructUsing(x => x.HasValue ? DateOnly.FromDateTime(x.Value) : null);

AssertConfigurationIsValid will work without any problems, but if you use the mapping, you will get the following error:

Unable to cast object of type 'System.Linq.Expressions.FullConditionalExpression' to type 'System.Linq.Expressions.NewExpression'.

The reason is that the ProjectBuilder will cast it to "NewExpression" and its not a "NewExpression".

Normally its easy to check the lambda (like x.Body.NodeType need to be ExpressionType.New). Is it possible to check it on "AssertConfigurationIsValid"?

Here is the full example:
https://gist.github.com/r-ising/ef54da6ba4db8264550095a6be90c7e0

[lbargaoanu]

No, because you might use Map for the same types. It's possible to do smth like that for CreateProjection. It could throw when using smth other than a new expression. A PR is welcome.