从数组中删除元素。 指数。 C＃。 名单 <double>

Question

I need your help. It's easy question, I think. So. I work in C# with array.

var TinArr = new List<double>();

Next I have some elements in it. For example:

TinArr[0]=0.5;
TinArr[1]=0.6;
TinArr[2]=1.1;
TinArr[3]=1.5;

Ok. Then I have cycle for remove some of them:

for (var j = 0; j < TinArr.Count; j++)
  {
     if (TinArr[j] <= 1)
     {
        TinArr.RemoveAt(j);
      }
   }

As I understand, when I'll remove element with index "0", next element with index "1" after this action will have index "0". Maybe I'm wrong. How can I save index? Or maybe I should start cycle from the beginning? NEED YOU HELP! THANKS!

Answer 1

You could simply use the RemoveAll method:

TinArr.RemoveAll(x => x <= 1);

But if using a for -loop is a requirement, you should start from the end:

for (var j = TinArr.Count - 1; j >= 0; j--)
{
    if (TinArr[j] <= 1)
    {
        TinArr.RemoveAt(j);
    }
}

Answer 2

Do it in reverse rather, something like

for (var j =TinArr.Count - 1; j >= 0; j--)
{
 if (TinArr[j] <= 1)
 {
    TinArr.RemoveAt(j);
  }
}

Answer 3

You almost did it yourself, only missing post-decrement:

for (var j = 0; j < TinArr.Count; j++)
    if (TinArr[j] <= 1)
        TinArr.RemoveAt(j--);