# LINQ相等

SequenceEqual 結果是一個布林值，如果兩個序列被發現是彼此相同 不適用 不適用

## SequenceEqual例子 - Enumerable.SequenceEqual方法

### C#

```using System;
using System.Collections.Generic;
using System.Linq;

namespace Operators
{
class SequenceEqual
{
static void Main(string[] args)
{
Pet barley = new Pet() { Name = "Barley", Age = 4 };
Pet boots = new Pet() { Name = "Boots", Age = 1 };
Pet whiskers = new Pet() { Name = "Whiskers", Age = 6 };

List<Pet> pets1 = new List<Pet>() { barley, boots };
List<Pet> pets2 = new List<Pet>() { barley, boots };
List<Pet> pets3 = new List<Pet>() { barley, boots, whiskers };

bool equal = pets1.SequenceEqual(pets2);
bool equal3 = pets1.SequenceEqual(pets3);

Console.WriteLine("The lists pets1 and pets2 {0} equal.", equal ? "are" :"are not");
Console.WriteLine("The lists pets1 and pets3 {0} equal.", equal3 ? "are" :"are not");

Console.WriteLine("\nPress any key to continue.");
}

class Pet
{
public string Name { get; set; }
public int Age { get; set; }
}
}
}```

### VB

```Module Module1
Sub Main()

Dim barley As New Pet With {.Name = "Barley", .Age = 4}
Dim boots As New Pet With {.Name = "Boots", .Age = 1}
Dim whiskers As New Pet With {.Name = "Whiskers", .Age = 6}

Dim pets1 As New System.Collections.Generic.List(Of Pet)(New Pet() {barley, boots})
Dim pets2 As New System.Collections.Generic.List(Of Pet)(New Pet() {barley, boots})
Dim pets3 As New System.Collections.Generic.List(Of Pet)(New Pet() {barley, boots, whiskers})

Dim equal As Boolean = pets1.SequenceEqual(pets2)
Dim equal3 As Boolean = pets1.SequenceEqual(pets3)

Console.WriteLine("The lists pets1 and pets2 {0} equal.", IIf(equal, "are", "are not"))
Console.WriteLine("The lists pets1 and pets3 {0} equal.", IIf(equal3, "are", "are not"))

Console.WriteLine(vbLf & "Press any key to continue.")
End Sub

Class Pet
Public Property Name As String
Public Property Age As Integer
End Class
End Module```

```The lists pets1 and pets2 are equal.
The lists pets1 and pets3 are not equal.

Press any key to continue.```