Check items in list<string> contains items of other list<sring> C#

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C#

allTopics = await _dbContext.Collection.Find(x => x.ParentContentIds.Contains(String.Join(",", filter.SolutionIds))).ToListAsync();

Here ParentContentIds and filter.SolutionIds are List<string>

But even if having data, no data returned. I want to check all items from Collection with a condition that only records with ParentContentIds in filter.SolutionId.

Can anybody help me?

What I have tried:

C#

allTopics = await _dbContext.Collection.Find(x => x.ParentContentIds.Contains(String.Join(",", filter.SolutionIds))).ToListAsync();

Posted 12-Jul-22 2:03am

Kunjammu

Updated 12-Jul-22 6:14am

Sean Ewington

v2

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OriginalGriff · Answer 1 · 2022-07-12T02:26:00

string.Join converts a collection of strings into a single string, separated by one or more of the separator string you specify.
So if filter.SolutionIds contains three strings "1", "2", and "3", then String.Join(",", filter.SolutionIds) will return a string containing a single string "1,2,3".

And string.Contains looks for an exact string match as a subset of the input string - in the example above:

"1,1,2,3,b"  will match.
"1,2,3"      will match.
"1,1,2,3,b"  will not match.
"1,1,2"      will not match.
"1"          will not match.
"2"          will not match.
"3"          will not match.

You probably need to decide exactly what you want to find, but if you only want to process ParentContentIds that exist in your Solution IDs, then reverse the check:
filter.SolutionIds.Contains(x.ParentContentIds)

But that's just a guess since we have no idea what your fields contain, or what exactly you are trying to do with them!

Richard Deeming · Answer 2 · 2022-07-12T04:22:00

Solution 2

Difficult to say without seeing the structure of your model, but perhaps something like this?

C#

allTopics = await _dbContext.Collection
    .Where(x => x.ParentContentIds.Any(p => filter.SolutionIds.Contains(p)))
    .ToListAsync();

Posted 12-Jul-22 4:22am

Richard Deeming