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checking if a string variable is null always return false

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Posted on by johnjohn123

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I have a SharePoint field named "Prime Mover" of type People/Group >> and it is optional, where i have the following actions:-

1) Get the display name of the "Prime Mover"

2) Assign it to a variable

3) Check if this variable is null

but even if the user did not enter "Prime Mover" value >> condition (check if the variable is null) will evaluate to false, as follow:-

here is the output when the flow runs:-

any advice on this please?

Thanks

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Pstork1 68,273 Most Valuable Professional on at

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Re: checking if a string variable is null always return false

String variables by definition are never null. They may be blank, but they aren't null. Null means the value doesn't exist. Blank means there is no value in the string. Its = ""

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johnjohn123 3,504 on at

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Re: checking if a string variable is null always return false

@Pstork1 so is there an IsBlank() function i can use?

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Pstork1 68,273 Most Valuable Professional on at

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Re: checking if a string variable is null always return false

No, there isn't an isblank() function. But you can just leave the right side of the condition empty, instead of adding a Null. That will check to see if its an empty string.

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johnjohn123 3,504 on at

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Re: checking if a string variable is null always return false

@Pstork1 I used Empty() function and set the right side of the condition to "true" .. seems it fixed the issue

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Pstork1 68,273 Most Valuable Professional on at

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Re: checking if a string variable is null always return false

That will work as well, but it isn't necessary. You can just leave it blank.

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