# IComparableIComparableIComparableIComparable Interface

## 정의

값 형식 또는 클래스에서 해당 인스턴스를 정렬 및 순서 지정하기 위해 구현하는 일반화된 형식별 비교 메서드를 정의합니다.Defines a generalized type-specific comparison method that a value type or class implements to order or sort its instances.

``public interface class IComparable``
``````[System.Runtime.InteropServices.ComVisible(true)]
public interface IComparable``````
``type IComparable = interface``
``Public Interface IComparable``
파생
특성

## 예제

다음 예제 구현의 IComparable 필수 CompareTo 메서드.The following example illustrates the implementation of IComparable and the requisite CompareTo method.

``````using namespace System;
using namespace System::Collections;

public ref class Temperature: public IComparable {
/// <summary>
/// IComparable.CompareTo implementation.
/// </summary>
protected:
// The value holder
Double m_value;

public:
virtual Int32 CompareTo( Object^ obj ) {

if (obj == nullptr) return 1;

if ( obj->GetType() == Temperature::typeid ) {
Temperature^ temp = dynamic_cast<Temperature^>(obj);

return m_value.CompareTo( temp->m_value );
}
throw gcnew ArgumentException(  "object is not a Temperature" );
}

property Double Value {
Double get() {
return m_value;
}
void set( Double value ) {
m_value = value;
}
}

property Double Celsius  {
Double get() {
return (m_value - 32) / 1.8;
}
void set( Double value ) {
m_value = (value * 1.8) + 32;
}
}
};

int main()
{
ArrayList^ temperatures = gcnew ArrayList;
// Initialize random number generator.
Random^ rnd = gcnew Random;

// Generate 10 temperatures between 0 and 100 randomly.
for (int ctr = 1; ctr <= 10; ctr++)
{
int degrees = rnd->Next(0, 100);
Temperature^ temp = gcnew Temperature;
temp->Value = degrees;
}

// Sort ArrayList.
temperatures->Sort();

for each (Temperature^ temp in temperatures)
Console::WriteLine(temp->Value);
return 0;
}
// The example displays the following output to the console (individual
// values may vary because they are randomly generated):
//       2
//       7
//       16
//       17
//       31
//       37
//       58
//       66
//       72
//       95
``````
``````using System;
using System.Collections;

public class Temperature : IComparable
{
// The temperature value
protected double temperatureF;

public int CompareTo(object obj) {
if (obj == null) return 1;

Temperature otherTemperature = obj as Temperature;
if (otherTemperature != null)
return this.temperatureF.CompareTo(otherTemperature.temperatureF);
else
throw new ArgumentException("Object is not a Temperature");
}

public double Fahrenheit
{
get
{
return this.temperatureF;
}
set {
this.temperatureF = value;
}
}

public double Celsius
{
get
{
return (this.temperatureF - 32) * (5.0/9);
}
set
{
this.temperatureF = (value * 9.0/5) + 32;
}
}
}

public class CompareTemperatures
{
public static void Main()
{
ArrayList temperatures = new ArrayList();
// Initialize random number generator.
Random rnd = new Random();

// Generate 10 temperatures between 0 and 100 randomly.
for (int ctr = 1; ctr <= 10; ctr++)
{
int degrees = rnd.Next(0, 100);
Temperature temp = new Temperature();
temp.Fahrenheit = degrees;
}

// Sort ArrayList.
temperatures.Sort();

foreach (Temperature temp in temperatures)
Console.WriteLine(temp.Fahrenheit);

}
}
// The example displays the following output to the console (individual
// values may vary because they are randomly generated):
//       2
//       7
//       16
//       17
//       31
//       37
//       58
//       66
//       72
//       95
``````
``````Imports System.Collections

Public Class Temperature
Implements IComparable
' The temperature value
Protected temperatureF As Double

Public Overloads Function CompareTo(ByVal obj As Object) As Integer _
Implements IComparable.CompareTo

If obj Is Nothing Then Return 1

Dim otherTemperature As Temperature = TryCast(obj, Temperature)
If otherTemperature IsNot Nothing Then
Return Me.temperatureF.CompareTo(otherTemperature.temperatureF)
Else
Throw New ArgumentException("Object is not a Temperature")
End If
End Function

Public Property Fahrenheit() As Double
Get
Return temperatureF
End Get
Set(ByVal Value As Double)
Me.temperatureF = Value
End Set
End Property

Public Property Celsius() As Double
Get
Return (temperatureF - 32) * (5/9)
End Get
Set(ByVal Value As Double)
Me.temperatureF = (Value * 9/5) + 32
End Set
End Property
End Class

Public Module CompareTemperatures
Public Sub Main()
Dim temperatures As New ArrayList
' Initialize random number generator.
Dim rnd As New Random()

' Generate 10 temperatures between 0 and 100 randomly.
For ctr As Integer = 1 To 10
Dim degrees As Integer = rnd.Next(0, 100)
Dim temp As New Temperature
temp.Fahrenheit = degrees
Next

' Sort ArrayList.
temperatures.Sort()

For Each temp As Temperature In temperatures
Console.WriteLine(temp.Fahrenheit)
Next
End Sub
End Module
' The example displays the following output to the console (individual
' values may vary because they are randomly generated):
'       2
'       7
'       16
'       17
'       31
'       37
'       58
'       66
'       72
'       95
``````

## 설명

이 인터페이스는 해당 값을 정렬 하거나 정렬할 수 형식에서 구현 됩니다.This interface is implemented by types whose values can be ordered or sorted. 구현 형식 단일 메서드를 정의 하는 것이 필요할 CompareTo(Object), 하는 정렬 순서에서 현재 인스턴스의 위치 인지 나타내는 이전 후 동일한 형식의 두 번째 개체와 동일 합니다.It requires that implementing types define a single method, CompareTo(Object), that indicates whether the position of the current instance in the sort order is before, after, or the same as a second object of the same type. 인스턴스의 IComparable 구현을 라고 자동으로 메서드에서 같은 Array.SortArrayList.Sort입니다.The instance's IComparable implementation is called automatically by methods such as Array.Sort and ArrayList.Sort.

구현의 합니다 CompareTo(Object) 메서드를 반환 해야 합니다는 Int32 있는 세 가지 값 중 하나는 다음 표에 나와 있는 것 처럼 합니다.The implementation of the CompareTo(Object) method must return an Int32 that has one of three values, as shown in the following table.

Value 의미Meaning
0보다 작음Less than zero 현재 인스턴스가 지정한 개체 앞에 CompareTo 정렬 순서에서 메서드.The current instance precedes the object specified by the CompareTo method in the sort order.
0Zero 이 현재 인스턴스에 지정 된 개체와 정렬 순서에서 같은 위치에서 발생 된 CompareTo 메서드.This current instance occurs in the same position in the sort order as the object specified by the CompareTo method.
0보다 큼Greater than zero 이 현재 인스턴스에 의해 지정 된 개체 다음에 오는 여 CompareTo 정렬 순서에서 메서드.This current instance follows the object specified by the CompareTo method in the sort order.

모든 숫자 형식 (같은 Int32 하 고 Double) 구현 IComparable같이 StringChar, 및 DateTime합니다.All numeric types (such as Int32 and Double) implement IComparable, as do String, Char, and DateTime. 사용자 지정 형식의 자체 구현을 제공 해야 IComparable 정렬 되거나 정렬 될 개체 인스턴스를 사용 하도록 설정 합니다.Custom types should also provide their own implementation of IComparable to enable object instances to be ordered or sorted.

## 메서드

 CompareTo(Object) CompareTo(Object) CompareTo(Object) CompareTo(Object) 현재 인스턴스와 동일한 형식의 다른 개체를 비교하고 정렬 순서에서 현재 인스턴스의 위치가 다른 개체보다 앞인지, 뒤인지 또는 동일한지를 나타내는 정수를 반환합니다.Compares the current instance with another object of the same type and returns an integer that indicates whether the current instance precedes, follows, or occurs in the same position in the sort order as the other object.