I have
List<string> strs;
double[] values;
where the values array contains the value of each of the string in strs list
Say strs={"abc","def","ghi"}
and values={3,1,2}
this means "abc" has value 3 and so on.
I wish to sort strs and values ordered by values, such that it becomes
strs={"def","ghi","abc"}
values={1,2,3}
Is there any easy way to achieve this?
The Array.Sort method has an overload that takes two arrays and sorts both arrays according to the values in the first array, so make an array out of the list:
string[] strsArr = strs.ToArray();
Then sorting them can't be simpler:
Array.Sort(values, strsArr);
And then back to a list, if you need that:
strs = strsArr.ToList();
You can use Enumerable.Zip, then sort the result, then extract the list of strings.
Something like:
var result = strs.Zip(values, (first, second) => new Tuple<string, double>(first, second))
.OrderBy(x => x.Item2)
.Select(x => x.Item1)
.ToList();
How are you setting up these collections? Or are you given these two parameters?
You could create a StringAndOrder class and use LINQ:
public class StringAndOrder
{
public string String { get; set; }
public double Order { get; set; }
}
List<StringAndOrder> list; //create with this structure instead
var orderedStrings = list.OrderBy(item => item.Order).Select(item => item.String);
var sortedStrs = strs.Select((i, s) => new {Value = values[i], Str = s})
.OrderBy(x => x.Value)
.Select(x => x.Str).ToList();
If you could logically put those values as properties of a class, such as:
class NameAndOrder
{
public string Name;
public int Order;
}
Then it would be better and more organized, and then you could do:
var items = new List<NameAndOrder>(strs.Count);
for (var i = 0; i < strs.Count; i++)
{
items.Add(new NameAndOrder { Name = strs[i], Order = values[i] });
}
items.Sort((a, b) => a.Order.CompareTo(b.Order));
Why Don't you use Dictionary Object..
Dictionary<string, int> dictionary =
new Dictionary<string, int>();
dictionary.Add("cat", 2);
dictionary.Add("dog", 1);
dictionary.Add("llama", 0);
dictionary.Add("iguana", -1);
// Acquire keys and sort them.
var list = dictionary.Keys.ToList();
list.Sort();
var strs = new[] { "abc", "def", "ghi" };
var values = new[] { 3, 1, 2 };
var newArr = strs.Select((s, i) => new { s, i })
.OrderBy(x => values[x.i])
.Select(x => x.s)
.ToArray();
