Question

I have a comma separated string which specifies the indexes. Then I have one more comma separated string which has all the values.

EX:

  string  strIndexes = "5,6,8,15";
  string  strData =  "ab*bc*dd*ff*aa*ss*ee*mm*jj*ii*waa*jo*us*ue*ed*ws*ra";

Is there a way to split the string strData and select only the elements which are at index 5, 6, 8 or 15. Or will I have to split the string first then loop through the array/list and then build one more array/list with the values at indexes defined by string strIndexes (i.e. 5, 6,7,15 in this example)

Thanks

Answer 1

It’s reasonably simple:

var allValues = strData.Split('*')
var selected = strIndexes.Split(',')
                         .Select(x => int.Parse(x))
                         .Select(index => allValues[index]);

You can create a list from that (by calling selected.ToList()) or you can just iterate over it.