CODEWITHSUNDEEP
c#linqlistmemory-management
Angelo cardona
Angelo cardona

Reputation: 35

delete item in a list c#

I need a little help. I have 2 lists in my project: 1 has 5,000 items, listA, and the other has 10,000 items, listB. I am reading the list using a for loop:

for(int j = 5000 - 1; j > 0; j--)

I need to delete the last item in listA,and in listB, I need to delete the last 2 items. This process is necessary because I need to optimize memory in my software.

i really appreciate any help Thanks

I tried to do this, but it doesn't work:

listA.RemoveAt(j);
listB.RemoveAt(9999 - i + 1);
listB.RemoveAt(9999 - i );

Upvotes: 0

Views: 98

Answers (2)

p.s.w.g
p.s.w.g

Reputation: 149000

Since j seems to always be equal to the index of the last item in listA, 2 * j + 1 is always equal to the index of the last item in listB. So you could just use RemoveAt / RemoveRange:

listA.RemoveAt(j);
listB.RemoveRange(2 * j, 2);

Also, if memory management is a big concern you might want to consider shrinking your list after a while by setting the Capacity (note that this can have performance impacts so you should avoid doing this too eagerly).

listA.Capacity = j;
listB.Capacity = 2 * j;

Upvotes: 0

MetaColon
MetaColon

Reputation: 2923

To delete the last item do

listA.RemoveAt(listA.Count - 1)

For the last two items simply execute it twice. You should check though wether the count is already 0, otherwise you'll get an exception.

Upvotes: 3

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