Question

I am trying to Filter a list on Multiple columns. I know I can loop thru the list collection and filter the records, is there any better way?

My first criteria is colA != “X” and if colA == “Y”than check for colB value for this type only.

I have to allow all values on colA except “X” and if ColA == “Y” && colB == “T” ( I check colB value only if ColA == “Y”) I am not able to write this.

Basically if ColA == “X” then don’t allow and if ColA == “Y” then check for colB value and filter depending on the value. Allow rest of all ColA values.

Accounts = Accounts.Where(acc => acc.ColA != “X” || ??).ToArray();

Answer 1

Something like this should work if I am understanding your question correctly.

Accounts.Where(acc => !(acc.ColA == "X" || (acc.ColA == "Y" && acc.ColB == "T"))).ToArray();

However, I think this is more readable:

Accounts
    .Where(acc => !(acc.ColA == "X"))
    .Where(acc => !(acc.ColA == "Y" && acc.ColB == "T"))
    .ToArray();