How to delete an item from a List of Strings if found in a Datatable using LINQ


I have a List with the following data:

List(3) { “13.04.2023”, “14.04.2023”, “17.04.2023” }

I also have a Datatable with the following data on Column A:


The point is, I need to remove the two dates that can be found in the datatable from the list, so that my list can look like this at the end:
List(1) { “14.04.2023” }

Does anyone know how can I achieve this using a Linq expression?

Thank you!


Welcome to UiPath forum

Hope the below steps would help you resolve this

First let’s get the datatable column as a list of string and then compare with the list variable u already have

To convert a datacolumn as a list of string use this expression in a assign activity

List2 = ( From row in dt.AsEnumerable() Select Convert.Tostring(row(“ColumnName”)) ) .ToList()

And now compare these two list variables to get the difference in them

List_output = list1.Where(Function(x) not list2.Contains(x)).toList()

U can place the list variables in the expression vice versa as per ur need

Cheers @Alexandru_Florin

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Assign activity
arrDTValues =
yourDataTableVar.AsEnumerable().Select(Function (x) x("Column A").toString.Trim).toArray

Assign activity
YourListVar = YourListVar.Except(arrDTValues).toList

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Hi @Alexandru_Florin ,

Heres another approach:

ListVariable.Except(datatableVariable.AsEnumerable().Select(Function(row) row("Column A").ToString())).ToList()


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It worked! Thank you very much! :slight_smile:

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Glad it got resolved @Alexandru_Florin

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