# IComparer<T> 接口

## 定义

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

T

## 示例

``````// 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
``````

## 方法

 比较两个对象并返回一个值，该值指示一个对象小于、等于还是大于另一个对象。