TimeSpan.Parse breaking change in .Net Framework 4

This week my team upgraded our solutions to Visual Studio 2010 and .Net framework 4. When we ran the tests of one our projects, one of our tests failed with a weird reason. The code is simple:

public DateTime CreateDateWithGivenTime(string time)
{

var t = TimeSpan.Parse(time);
...

}

The test was:

[Test]
[ExpectedException(typeof(OverflowException))]
public void CreateDateWithGivenTime_HoursNotInRange_ThrowOverflowException()
{

CreateDateWithGivenTime("77:11:00");

}

Testing on a branch before the conversion – the test passed.

Debugging the code in both cases showed different behavior of the framework:

Framework 3.5: Throws exception

Framework 4: Code recovers and parses the string as if “77” is days, “11” is hours etc…

Read more: YsA.net

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