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Asked: 2026-05-21T08:40:17+00:00

I learnt the reference type parameter passing is just a copy of the reference.

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I learnt the reference type parameter passing is just a copy of the reference. If you set the passed in refernece parameter point to another object inside the called method, the orginal reference will not change.

I have a test method to test the reference type parameter passing. A refTest(SystemSwEvent systemSwEvent) method is called from that test method with a valid SystemSwEvent type object. Inside the refTest() method, the processEvScanDataAvailable(EvScanDataAvaialble systemSwEvent) method is called. Inside the processEvScanDataAvailable(EvScanDataAvaialble systemSwEvent) method, I set the passed in reference parameter to null. I expect the parameter in refTest() should not be changed. But that is not true. It will be changed to null momentarily. why?enter image description here

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1 Answer

  1. Editorial Team

    why?

    I suspect this is a debugger issue, and not representative of what’s actually occurring inside the CLR.

    Try using different variable names for your arguments, and this behavior will go away.

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