Enum.Equals(Object) メソッド
定義
重要
一部の情報は、リリース前に大きく変更される可能性があるプレリリースされた製品に関するものです。 Microsoft は、ここに記載されている情報について、明示または黙示を問わず、一切保証しません。
このインスタンスが指定したオブジェクトと等しいかどうかを示す値を返します。
public:
override bool Equals(System::Object ^ obj);public override bool Equals(object obj);public override bool Equals(object? obj);override this.Equals : obj -> boolPublic Overrides Function Equals (obj As Object) As Booleanパラメーター
- obj
- Object
このインスタンスと比較するオブジェクト、または null。
返品
true
objが同じ型の列挙値であり、このインスタンスと同じ基になる値を持つ場合はfalse。
例
次の例は、 Equals メソッドの使用方法を示しています。
using System;
public class EqualsTest {
enum Colors { Red, Green, Blue, Yellow };
enum Mammals { Cat, Dog, Horse, Dolphin };
public static void Main() {
Mammals myPet = Mammals.Cat;
Colors myColor = Colors.Red;
Mammals yourPet = Mammals.Dog;
Colors yourColor = Colors.Red;
Console.WriteLine("My favorite animal is a {0}", myPet);
Console.WriteLine("Your favorite animal is a {0}", yourPet);
Console.WriteLine("Do we like the same animal? {0}", myPet.Equals(yourPet) ? "Yes" : "No");
Console.WriteLine();
Console.WriteLine("My favorite color is {0}", myColor);
Console.WriteLine("Your favorite color is {0}", yourColor);
Console.WriteLine("Do we like the same color? {0}", myColor.Equals(yourColor) ? "Yes" : "No");
Console.WriteLine();
Console.WriteLine("The value of my color ({0}) is {1}", myColor, Enum.Format(typeof(Colors), myColor, "d"));
Console.WriteLine("The value of my pet (a {0}) is {1}", myPet, Enum.Format(typeof(Mammals), myPet, "d"));
Console.WriteLine("Even though they have the same value, are they equal? {0}",
myColor.Equals(myPet) ? "Yes" : "No");
}
}
// The example displays the following output:
// My favorite animal is a Cat
// Your favorite animal is a Dog
// Do we like the same animal? No
//
// My favorite color is Red
// Your favorite color is Red
// Do we like the same color? Yes
//
// The value of my color (Red) is 0
// The value of my pet (a Cat) is 0
// Even though they have the same value, are they equal? No
open System
type Colors =
| Red = 0
| Green = 1
| Blue = 2
| Yellow = 3
type Mammals =
| Cat = 0
| Dog = 1
| Horse = 2
| Dolphin = 3
let myPet = Mammals.Cat
let myColor = Colors.Red
let yourPet = Mammals.Dog
let yourColor = Colors.Red
printfn
$"""My favorite animal is a {myPet}
Your favorite animal is a {yourPet}
Do we like the same animal? {if myPet.Equals yourPet then "Yes" else "No"}
My favorite color is {myColor}
Your favorite color is {yourColor}
Do we like the same color? {if myColor.Equals yourColor then "Yes" else "No"}
The value of my color ({myColor}) is {Enum.Format(typeof<Colors>, myColor, "d")}
The value of my pet (a {myPet}) is {Enum.Format(typeof<Mammals>, myPet, "d")}
Even though they have the same value, are they equal? {if myColor.Equals myPet then "Yes" else "No"}"""
// The example displays the following output:
// My favorite animal is a Cat
// Your favorite animal is a Dog
// Do we like the same animal? No
//
// My favorite color is Red
// Your favorite color is Red
// Do we like the same color? Yes
//
// The value of my color (Red) is 0
// The value of my pet (a Cat) is 0
// Even though they have the same value, are they equal? No
Public Enum SledDog As Integer
Unknown=0
AlaskanMalamute=1
Malamute=1
Husky=2
SiberianHusky=2
End Enum
Public Enum WorkDog As Integer
Unknown=0
Newfoundland=1
GreatPyrennes=2
End Enum
Module Example
Public Sub Main()
Dim dog1 As SledDog = SledDog.Malamute
Dim dog2 As SledDog = SledDog.AlaskanMalamute
Dim dog3 As WorkDog = WorkDog.Newfoundland
Console.WriteLine("{0:F} ({0:D}) = {1:F} ({1:D}): {2}",
dog1, dog2, dog1.Equals(dog2))
Console.WriteLine("{0:F} ({0:D}) = {1:F} ({1:D}): {2}",
dog1, dog3, dog1.Equals(dog3))
End Sub
End Module
' The example displays the following output:
' Malamute (1) = Malamute (1): True
' Malamute (1) = Newfoundland (1): False
次の例では、 SledDog と WorkDogの 2 つの列挙型を定義します。
SledDog列挙には、基になる値が同じ 2 つのメンバー (SledDog.AlaskanMalamuteとSledDog.Malamute) があります。
Equals メソッドの呼び出しは、基になる値が同じであるため、これらの値が等しいことを示します。
SledDog.MalamuteメンバーとWorkDog.Newfoundland メンバーは、異なる列挙型を表しますが、基になる値は同じです。
Equals メソッドの呼び出しは、これらの値が等しくないことを示します。
using System;
public enum SledDog { Unknown=0, AlaskanMalamute=1, Malamute=1,
Husky=2, SiberianHusky=2 };
public enum WorkDog { Unknown=0, Newfoundland=1, GreatPyrennes=2 };
public class Example
{
public static void Main()
{
SledDog dog1 = SledDog.Malamute;
SledDog dog2 = SledDog.AlaskanMalamute;
WorkDog dog3 = WorkDog.Newfoundland;
Console.WriteLine("{0:F} ({0:D}) = {1:F} ({1:D}): {2}",
dog1, dog2, dog1.Equals(dog2));
Console.WriteLine("{0:F} ({0:D}) = {1:F} ({1:D}): {2}",
dog1, dog3, dog1.Equals(dog3));
}
}
// The example displays the following output:
// Malamute (1) = Malamute (1): True
// Malamute (1) = Newfoundland (1): False
type SledDog =
| Unknown = 0
| AlaskanMalamute = 1
| Malamute = 1
| Husky = 2
| SiberianHusky = 2
type WorkDog =
| Unknown = 0
| Newfoundland = 1
| GreatPyrennes = 2
let dog1 = SledDog.Malamute
let dog2 = SledDog.AlaskanMalamute
let dog3 = WorkDog.Newfoundland
printfn $"{dog1:F} ({dog1:D}) = {dog2:F} ({dog2:D}): {dog1.Equals dog2}"
printfn $"{dog1:F} ({dog1:D}) = {dog3:F} ({dog3:D}): {dog1.Equals dog3}"
// The example displays the following output:
// Malamute (1) = Malamute (1): True
// Malamute (1) = Newfoundland (1): False
Public Enum SledDog As Integer
Unknown=0
AlaskanMalamute=1
Malamute=1
Husky=2
SiberianHusky=2
End Enum
Public Enum WorkDog As Integer
Unknown=0
Newfoundland=1
GreatPyrennes=2
End Enum
Module Example
Public Sub Main()
Dim dog1 As SledDog = SledDog.Malamute
Dim dog2 As SledDog = SledDog.AlaskanMalamute
Dim dog3 As WorkDog = WorkDog.Newfoundland
Console.WriteLine("{0:F} ({0:D}) = {1:F} ({1:D}): {2}",
dog1, dog2, dog1.Equals(dog2))
Console.WriteLine("{0:F} ({0:D}) = {1:F} ({1:D}): {2}",
dog1, dog3, dog1.Equals(dog3))
End Sub
End Module
' The example displays the following output:
' Malamute (1) = Malamute (1): True
' Malamute (1) = Newfoundland (1): False
注釈
Enum.Equals(Object) メソッドは、ValueType.Equals(Object)をオーバーライドして、列挙メンバーが等しいかどうかを評価する方法を定義します。
