Remove items from multiple nested list using linq

Question

I am having nested list items ParticipantsDetails & AssigneeDetails inside parent list TransactionHistoryDetails .

Both of nested list contains Name Property and I would like to remove items which contain Name as null

Code:

transactionHistory.TransactionHistoryDetails.ForEach(u => u.ParticipantsDetails.RemoveAll(a => a.Name == null));

transactionHistory.TransactionHistoryDetails.ForEach(u => u.AssigneeDetails.RemoveAll(a => a.Name == null));

This code works! But is there any way I can achieve the same in a single line by using || operator?

Answer 1

You cannot achieve this in a single line, because your two calls of RemoveAll operate on two separate collections. You can combine the two lambdas into a single one, like this:

transactionHistory.TransactionHistoryDetails.ForEach(u => {
    u.ParticipantsDetails.RemoveAll(a => a.Name == null);
    u.AssigneeDetails.RemoveAll(a => a.Name == null);
});

Note: There are alternative approaches to this. For example, you can introduce a method on TransactionHistoryDetails to "sanitize" both lists, essentially hiding two RemoveAll lines from sight.