How to Capture the Exception Message From Assert.Throws in NUnit

In the past I’ve used:

[ExpectedException(typeof(CustomException), ExpectedMessage="blah blah blah")] 

to set an exception expectation and assert on the message. With the recent releases of NUnit I’ve finally transitioned all my code to use:

Assert.Throws<CustomException>(() => someType.someMethod(someValue));



if the method has no parameters.

Only lately have I needed to capture the exception message and validate it. To do this you do the following:

var ex = Assert.Throws<CustomException>(() => someType.someMethod(someValue));

Assert.That(ex.Message, Is.EqualTo("expected message here"));

I am blogging about this because I keep forgetting how to capture the exception message. Hope it helps someone else.

Jason Meridth


My name is Jason Meridth. I am a continuously learning senior software developer/devops/team lead/development manager trying to not let best be the enemy of better. I reserve the right to change my mind upon obtaining more information. I am also the owner and principal software consultant at Meridth, LLC. If you have any software, hardward, networking, process, etc needs please don't hesitate to reach out to me.

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