Remove list elements at given indices

Question

I have a list which contains some items of type string.

List lstOriginal;

I have another list which contains idices which sh

Answer 1

How are you populating the list of indices? There's a much more efficient RemoveAll method that you might be able to use. For example, instead of this:

var indices = new List();
int index = 0;
foreach (var item in data)
    if (SomeFunction(data))
        indices.Add(index++);

//then some logic to remove the items

you could do this:

data.RemoveAll(item => SomeFunction(item));

This minimizes the copying of items to new positions in the array; each item is copied only once.

You could also use a method group conversion in the above example, instead of a lambda:

data.RemoveAll(SomeFunction);