c# List<T> Sort : by Chinese strokes
Pregunta
I have a webpage, in which there is a sort that I have to order the list by Chinese strokes.
I have created an application containing code like this:
List<Student> stuList = new List<Student>() {
new Student("上海"),
new Student("深圳"),
new Student("广州"),
new Student("香港")
};
System.Globalization.CultureInfo strokCi = new System.Globalization.CultureInfo("zh-tw");
System.Threading.Thread.CurrentThread.CurrentCulture = strokCi; ;
//stuList.sort();
but there is an error: At least one object must implement IComparable.
What does this mean and how can I fix it?
Solución
You need to have your Student
class implement the IComparable
interface. This requires implementing a method CompareTo
, which can simply return the result of calling CompareTo
between the strings you're trying to order by.
For example, if the constructor initializes a name
field, you might have something like this:
public class Student : IComparable
{
private string name;
public Student(string name)
{
this.name = name;
}
public int CompareTo(object other)
{
Student s = other as Student;
if (s == null)
{
throw new ArgumentException("Students can only compare with other Students");
}
return this.name.CompareTo(s.name);
}
}
Otros consejos
Student
must implement IComparable
.
Rather than implement IComparable
, why not just use a bit of LINQ?
stuList.OrderBy( s => s.Name ) //.ToList if you really want a List
public class Student : IComparable
{
private string message = null;
public Student(string message)
{
this.message = message;
}
#region IComparable Members
public int CompareTo(object obj)
{
// implement your logic, here is a example:
if (obj != null)
return message.CompareTo(((Student)obj).message);
return int.MinValue;
}
#endregion
}
Licenciado bajo: CC-BY-SA con atribución
No afiliado a StackOverflow