# IComparer<T>IComparer<T>IComparer<T>IComparer<T> Interface

## 定義

2 つのオブジェクトを比較するために型が実装するメソッドを定義します。Defines a method that a type implements to compare two objects.

``````generic <typename T>
public interface class IComparer``````
``public interface IComparer<in T>``
``type IComparer<'T> = interface``
``Public Interface IComparer(Of In T)``

T

## 例

``````// This class is not demonstrated in the Main method
// and is provided only to show how to implement
// the interface. It is recommended to derive
// from Comparer<T> instead of implementing IComparer<T>.
public class BoxComp : IComparer<Box>
{
// Compares by Height, Length, and Width.
public int Compare(Box x, Box y)
{
if (x.Height.CompareTo(y.Height) != 0)
{
return x.Height.CompareTo(y.Height);
}
else if (x.Length.CompareTo(y.Length) != 0)
{
return x.Length.CompareTo(y.Length);
}
else if (x.Width.CompareTo(y.Width) != 0)
{
return x.Width.CompareTo(y.Width);
}
else
{
return 0;
}
}
}
``````
``````' This class is not demonstrated in the Main method
' and is provided only to show how to implement
' the interface. It is recommended to derive
' from Comparer<T> instead of implementing IComparer<T>.
Public Class BoxComp
Implements IComparer(Of Box)
' Compares by Height, Length, and Width.
Public Function Compare(ByVal x As Box, ByVal y As Box) As Integer Implements _
IComparer(Of Box).Compare
If x.Height.CompareTo(y.Height) <> 0 Then
Return x.Height.CompareTo(y.Height)
ElseIf x.Length.CompareTo(y.Length) <> 0 Then
Return x.Length.CompareTo(y.Length)
ElseIf x.Width.CompareTo(y.Width) <> 0 Then
Return x.Width.CompareTo(y.Width)
Else
Return 0
End If
End Function
End Class
``````

## 注釈

このインターフェイスを併用、List<T>.SortList<T>.BinarySearchメソッド。This interface is used with the List<T>.Sort and List<T>.BinarySearch methods. コレクションの並べ替え順序をカスタマイズする方法を提供します。It provides a way to customize the sort order of a collection. このインターフェイスを実装するクラスには、SortedDictionary<TKey,TValue>SortedList<TKey,TValue>ジェネリック クラスです。Classes that implement this interface include the SortedDictionary<TKey,TValue> and SortedList<TKey,TValue> generic classes.

このインターフェイスの既定の実装は、Comparer<T>クラス。The default implementation of this interface is the Comparer<T> class. StringComparerクラスの種類には、このインターフェイスを実装するStringします。The StringComparer class implements this interface for type String.

このインターフェイスは、順序の比較をサポートします。This interface supports ordering comparisons. つまり、ときに、Compareメソッドは 0 を返します、同じ 2 つのオブジェクトを並べ替えることを意味します。That is, when the Compare method returns 0, it means that two objects sort the same. によって提供される正確な等価比較の実装、IEqualityComparer<T>ジェネリック インターフェイス。Implementation of exact equality comparisons is provided by the IEqualityComparer<T> generic interface.

## メソッド

 Compare(T, T) Compare(T, T) Compare(T, T) Compare(T, T) 2 つのオブジェクトを比較して、一方が他方より小さいか、同じか、または大きいかを示す値を返します。Compares two objects and returns a value indicating whether one is less than, equal to, or greater than the other.