Question

public void sort() 
{
    datelist = new List<DateTime>(rdate);   //timedates
    intlist = new List <Int>(rint);         //integers

    datelist.Sort((a, b) => a.CompareTo(b)); //sorts the dates ascending(I think)
}

I have two initial arrays; these match by index number. I have converted these to lists in order to sort them. How would I sort intlist in exactly the same way as the datelist? Thanks.

Answer 1

Assuming you have linq at your disposal (.net 3.5 +) you can do the following.

// Define your collections
var dates = new[]
                {
                    new DateTime(2012, 1, 1), new DateTime(2012, 1, 2), new DateTime(2012, 1, 5),
                    new DateTime(2012, 1, 3)
                };
var ints = new[] {1,2,4,3};

var result = dates
    .Select((d, i) => new {Date = d, Int = ints[i]}) // This joins the arrays based on index
    .OrderBy(o => o.Date) // Sort by whatever field you want
    .ToArray(); // Return the results an array

// Extract just the dates
dates = result.Select(o => o.Date).ToArray();
// Extract just the ints
ints = result.Select(o => o.Int).ToArray();