Ok, this is possible, here is the corrected code.
// Create input parameter for lambda
ParameterExpression value = Expression.Parameter(typeof(IFoo),
// create return statement for lambda
Expression setupProperty = Expression.Property(value, "Bar");
// convert expression to lambda (should now be the equivalent
of "v => v.Bar")
var func = Expression.Lambda<Func<IFoo,
var mockFoo = new Mock<IFoo>();
mockFoo.SetupProperty(func); // this works now
mockFoo.Object.Bar = "Burge+";
I investigated this by creating an expression from a lambda using the
Expression<Func<IFoo, string>> setupBar = v => c.Bar;
I then looked at this in the debugger in vs 2010. Expressions have a
"Debug View" that shows a text representation of the expression so it
is possible to add a watch on that or something similar. The above
comes out as
I looked at this and tried to work out what Expressions would make
this, then created an expression and compared it in the debugger.
The interesting thing for me is that although this expression returns
a value there is no assignment or return statement. I guess this must
be implicit somehow.