False positive: precondition is redundant

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I know this doesn’t directly answer your question, but it appears you’re using a legacy mode for Code Contracts.

This document describes the recommended assembly mode based on usage requirements:

http://research.microsoft.com/en-us/projects/contracts/userdoc.pdf

From Pages 20, 21…

assembly mode usage guidelines

Another snippet from the document:

5.1.1 Assembly Mode

The contract tools need to know which usage mode you choose. If you use VisualStudio, select the Assemby Mode on the contract property pane as follows:

  • Usage 1 or 2: Standard Contract Requires
  • Usage 3: Custom Parameter Validation

This permits the tools to emit proper warnings when you violate the usage guidelines. If you use the tools
from the command-line, pass the proper argument for the -assemblyMode option

So using “Standard Contract Requires” assembly mode you could do either of the following:

Contract.Requires<ArgumentException>(a < 0, "a");
// OR
Contract.Requires(a < 0, "a should be negative");

Neither of these generate any warnings for me.

I hope this helps anyway.

Cheers
peteski

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