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I would like a way to get warnings when an object reference could potentially throw a Null Reference Exception, so that I can write defensive code for these.
I have looked at Resharper, but didn’t see anything there that accomplishes this.
Code Contracts is probably a non-starter; the application is quite large, and it’s written in .NET 3.5, before Code Contracts became officially available.
Resharper does in fact accomplish something like this. Possible NullReferenceExpections are highlighted in the IDE in blue, with tooltips when you hover over them.
Resharper then keeps track of potential errors and warnings in it’s own inspection results window (separate from Visual Studio’s compiler errors and warnings).