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How to assign null value to string parameter using contract class

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Posted on by Pooja Karki

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Hi All,

I have created contract class which consist string parm method. I am using this contract class for JSON searilization and then passing data to third party application. As per the requirement all the blank string values should be assign null value and json output should be like:

{

/name/: null

}

I have tried passing null value to method in the case output is coming like as below:

{

/name/:/ /

}

Please guide how I can achieve this. Thanks.

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Waed Ayyad 9,039 Super User 2025 Season 2 on at

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Hi,

Try the below code:

static void Job5(Args _args) { System.String nullStr; nullStr = CLRInterop::Null("System.String"); print CLRInterop::isInitialized(nullStr); print CLRInterop::isNull(nullStr); }

Based on this document:

https://learn.microsoft.com/en-us/dotnet/api/microsoft.dynamics.ax.xpp.clrinterop.null

Thanks,

Waed Ayyad

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Pooja Karki 3,045 on at

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I have tried below line and it is returning blank output.

CLRInterop::Null("System.String");

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Waed Ayyad 9,039 Super User 2025 Season 2 on at

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Hi,

Did you try to set the string with "null", give it a try and tell us the result.

Thanks,

Waed Ayyad

If this helped, please mark it as "Verified" for others facing the same issue

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Pooja Karki 3,045 on at

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Yes, I have tried passing value like:

classname.methodname(CLRInterop::Null("Null"));

in this case it is returning blank value.

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Martin Dráb 237,976 Most Valuable Professional on at

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If your methodname() method accepts str type and the backing variable is str too, it can't store null values. I don't know whether changing it to System.String will work, but it definitely can't work with str.

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