使用 List.Sort(Comparison) 在 C# 中对列表进行排序<T>比较

Question

I have created a class as follows:

public class StringMatch
{
   public int line_num;
   public int num_of_words;
}

I have created a list

List<StringMatch> sm;

it has few elements in it.

How do I sort this list using the Comparison<T> comparison overload? The sorting must be done based on the num_of_words field.

Answer 1

You can write lambda expression comparing two objects like this:

sm.Sort((x,y)=>x.num_of_words.CompareTo(y.num_of_words));

you can inverse sorting adding -

sm.Sort((x,y)=>-x.num_of_words.CompareTo(y.num_of_words));

Answer 2

您可以使用 Linq OrderBy方法 -

sm = sm.OrderBy(i => i.num_of_words).ToList();

Answer 3

There is a usage example on the official microsoft documentation . The example uses strings. Replace with int for your use.

private static int CompareDinosByLength(string x, string y)
{
   ...
}

List<string> dinosaurs = new List<string>();
dinosaurs.Add("Pachycephalosaurus");
dinosaurs.Add("Amargasaurus");
dinosaurs.Add("");
dinosaurs.Add(null);
dinosaurs.Add("Mamenchisaurus");
dinosaurs.Add("Deinonychus");
dinosaurs.Sort(CompareDinosByLength);

A little google goes a long way.

Answer 4

Using Comparison is an older and more clunky way of sorting collections. My advice would be to use the OrderBy method found in Linq :

var orderedSm = sm.OrderBy(x => x.num_of_words).ToList();