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Dynamics 365 Community / Forums / Finance | Project Operations, Human Resources, ... / How to assign null val...
Finance | Project Operations, Human Resources, ...
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How to assign null value to string parameter using contract class

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Posted on by Pooja Karki 3,045
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. 
  • Martin Dráb Profile Picture
    Martin Dráb 233,029 Most Valuable Professional on at
    How to assign null value to string parameter using contract class
    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.
  • Pooja Karki Profile Picture
    Pooja Karki 3,045 on at
    How to assign null value to string parameter using contract class
    Yes, I have tried passing value like:
     
    classname.methodname(CLRInterop::Null("Null"));
     
    in this case it is returning blank value.
  • Suggested answer
    Waed Ayyad Profile Picture
    Waed Ayyad 8,335 Super User 2025 Season 1 on at
    How to assign null value to string parameter using contract class
    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
  • Pooja Karki Profile Picture
    Pooja Karki 3,045 on at
    How to assign null value to string parameter using contract class
    I have tried below line and it is returning blank output.
     
    CLRInterop::Null("System.String");
  • Suggested answer
    Waed Ayyad Profile Picture
    Waed Ayyad 8,335 Super User 2025 Season 1 on at
    How to assign null value to string parameter using contract class
    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:
     
    Thanks,
    Waed Ayyad
    If this helped, please mark it as "Verified" for others facing the same issue

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