Question

I’m using this line of code to insert a value from an array into a certain line, in a list of lines.

lineList[LineNumber].Insert(lineList[LineNumber].Count(), pArray[i]);

After debugging all the variables are correct, the pArray is passed in as a parameter and lineList is inherited from another class. I can’t see why this wouldnt work, all the lines that are added are just empty?

Answer 1

This is because .NET strings are immutable; string.Insert returns a new string, rather than modifying an existing one. If you need to modify the string, add an assignment, like this:

lineList[LineNumber] = lineList[LineNumber]
    .Insert(lineList[LineNumber].Count(), pArray[i]);

This should be equivalent to

lineList[LineNumber] += pArray[i];