valerio.net

I just stumbled across what looks like a really great library for performing input validation called CutingEdge.Conditions.

I don’t know about you, but I find myself putting "if (variable==null)" or something similar at the beginning of almost every method I write.  Eventually I extracted the commonly-used validation codes out into static methods of a helper class, which helped.  CuttingEdge.Conditions takes things a step further (ok, a few steps further) by providing a fluent interface so you can write code like this:

    // Check all preconditions:
    id.Requires("id")
        .IsNotNull()          // throws ArgumentNullException on failure
        .IsInRange(1, 999)    // ArgumentOutOfRangeException on failure
        .IsNotEqualTo(128);   // throws ArgumentException on failure

Very cool! Here’s the scoop for CuttingEdge.Conditions:

• Home on Codeplex with download link
• .NET Junkie’s blog posts about it here and here
• A CodeProject article about it

Looks sweet.  I just downloaded it to give it a test drive.

Note: For those that (are forced to) worry about IP and licensing, it’s LGPL.

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