How to get [x] and [x+1] into a string then skip to [x+2]

Input : 1 ; a ; 2; b; 3;c;4;d;5;e;6;f

output I'm getting : 1a ; a2;b3;c4;d5;e6

output I want: 1a ; 2b ; 3c; 4d ;开发者_运维百科 5e; 6f

I know this is a simple thing but I just can't seem to get my damn head around it....

Heres my code:

 for (int x = 0; x < coll.Count; x++)
        {
            if (x == 0)
            {
                line.Append(coll[x].ToString());
                line.AppendLine(coll[x + 1].ToString());
            }
            else
            {

                if (x % 2 == 0)
                {

                }
                else
                {
                    try
                    {
                        line.Append(coll[x].ToString());
                        line.AppendLine(coll[x + 1].ToString());
                        x++;
                        textBox1.Text = line.ToString();
                    }
                    catch { }
                }
            }

If you want to keep the code the way it is (I'm assuming something will go in the empty conditional), then you just need to change if (x % 2 == 0) to if (x % 2 != 0) (or equally if (x % 2 == 1)), as your code is currently appending to the line when i = 0, then 1, 3,... i.e. all odd numbered indices, whereas you need to be appending to the line at all even numbered indices.

(Unfortunately I can't edit your question, but if you just stick four spaces in front of the line starting with for then it should be formatted correctly.)

If your list is like = [1,a,2,b,3,c,4,d,5,e,6,f] Try this;

String line = "";
for(int i=0;i<list.size();i+2){
  line += list.get(i)+list.get(i+1);      
}
  textBox1.Text = line;

EDIT And if you want semi colons;

I edited like

    String line = "";
    for(int i=0;i<list.size();i+2){
      line += list.get(i)+list.get(i+1);  
      if(i != list.size() - 2){
        line+=";";
      }
    }
      textBox1.Text = line;

One line code with LINQ (but not so efficient):

string[] source = { "1", "a", "2", "b", "3", "c" };
var result = source.Zip(source.Skip(1), (s1, s2) => s1 + s2)
                        .Where((s, i) => i % 2 == 0);
string[] arrayResult = result.ToArray();
string stringResultWithSeperator = string.Join(";", result);

Another LINQy solution:

string input = "1;a;2;b;3;c;4;d;5;e;6;f";

var split = input.Split(';');

string rejoined = String.Join(";", Pairs(split));

Where Pairs is

IEnumerable<string> Pairs(IEnumerable<string> strings)
{
    if (strings.Take(1).Count() == 0)
    {
        return new string[]{};
    }
    return new [] {String.Join("", strings.Take(2))}.Concat(Pairs(strings.Skip(2)));
}