System.IComparable.CompareTo 方法

System.IComparable.CompareTo 方法例子

在调用 Add 方法时，SortedList 集合使用 IComparable 实现对列表项进行排序，然后，这些列表项将按温度的升序显示。

using System;
using System.Collections.Generic;

public class Temperature : IComparable
{
    // Implement the CompareTo method. For the parameter type, Use 
    // the type specified for the type parameter of the generic 
    // IComparable interface. 
    //
    public int CompareTo(Temperature other)
    {
        // The temperature comparison depends on the comparison of the
        // the underlying Double values. Because the CompareTo method is
        // strongly typed, it is not necessary to test for the correct
        // object type.
        return m_value.CompareTo(other.m_value);
    }

    // The underlying temperature value.
    protected double m_value = 0.0;

    public double Celsius    
    {
        get
        {
            return m_value - 273.15;
        }
    }

    public double Kelvin    
    {
        get
        {
            return m_value;
        }
        set
        {
            if (value < 0.0)
            {
                throw new ArgumentException("Temperature cannot be less than absolute zero.");
            }
            else
            {
                m_value = value;
            }
        }
    }

    public Temperature(double kelvins)
    {
        this.Kelvin = kelvins;
    }
}

public class Example
{
    public static void Main()
    {
        SortedList temps = 
            new SortedList();

        // Add entries to the sorted list, out of order.
        temps.Add(new Temperature(2017.15), "Boiling point of Lead");
        temps.Add(new Temperature(0), "Absolute zero");
        temps.Add(new Temperature(273.15), "Freezing point of water");
        temps.Add(new Temperature(5100.15), "Boiling point of Carbon");
        temps.Add(new Temperature(373.15), "Boiling point of water");
        temps.Add(new Temperature(600.65), "Melting point of Lead");

        foreach( KeyValuePair kvp in temps )
        {
            Console.WriteLine("{0} is {1} degrees Celsius.", kvp.Value, kvp.Key.Celsius);
        }
    }
}

/* This code example produces the following output:

Absolute zero is -273.15 degrees Celsius.
Freezing point of water is 0 degrees Celsius.
Boiling point of water is 100 degrees Celsius.
Melting point of Lead is 327.5 degrees Celsius.
Boiling point of Lead is 1744 degrees Celsius.
Boiling point of Carbon is 4827 degrees Celsius.

*/

相关资源

IComparable 接口

System 命名空间

Object

IComparable

MSDN