how do you create a distinct list from a dataitem list?

Permanently deleted user

23. Februar 2013 05:00

What is the syntax to remove duplicates from a dataitem list?  I have tried this:  list2 =  list1.Distinct().ToList()    list1 and list2 are defined as dataitem lists.

i do not get an error, but the list is not unique.

J

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  Zack Robison

  17. Mai 2017 22:38

  I did not come up with an inline answer, so I wrote a bunch of workflow logic around the issue.  

   

  So, I ended up checking for duplication as I populate the list while iterating a featureSet.  I created a boolean variable set to true which will determine whether to add a given dataItem, then loop through the list itself(parallel foreach inside of a while which watches the boolean) and check the values of each dataItem in the list already against the new one made from a given feature.  Matches set the boolean to false, ending the loop.  The activity to insert the dataItem is within an if activity checking the boolean, so only non-dups get added.

   

  If the list is already generated, the same logic will work but you'll need a new list of dataitems.

   

  Would love to see a more elegant solution, this feels like unneeded code that could become problematic with large lists.

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