LINQ |等式运算符|顺序等式
原文:https://www . geesforgeks . org/linq-equality-operator-sequence eqal/
相等运算符用于检查给定的两个序列是否相等。在 LINQ，等式运算只包含一个称为序列等式的运算符。它用于检查序列或集合中的给定元素是否相等。如果给定的序列或集合相等，则返回真否则返回假。
- 如果集合或序列具有基本数据类型，它将比较值和元素的数量。
- 如果集合包含复杂类型的元素，它将检查对象的引用。
- 它不支持 C# 和 VB.Net 语言中的查询语法。
- 它支持 C# 和 VB.Net 语言中方法语法。
- 它同时出现在可查询类和可枚举类中。
- 它通过使用延迟执行来实现。
- 您可以使用 IEqualityComparer 类来比较两个复杂类型的集合。
例 1:
// C# program to check the given
// sequences are equal or not
using System;
using System.Linq;
class GFG {
static public void Main()
{
// Data source
char[] sequence1 = {'p', 'q', 'r', 's', 'y', 'z'};
char[] sequence2 = {'p', 'q', 'r', 's', 'y', 'z'};
// Display the sequences
Console.WriteLine("Sequence 1 is: ");
foreach(var s1 in sequence1)
{
Console.WriteLine(s1);
}
Console.WriteLine("Sequence 2 is: ");
foreach(var s2 in sequence2)
{
Console.WriteLine(s2);
}
// Check the given sequences are equal or
// not Using SequenceEqual function
var result = sequence1.SequenceEqual(sequence2);
Console.WriteLine("Given Sequences are equal: {0}", result);
}
}
Output:
Sequence 1 is:
p
q
r
s
y
z
Sequence 2 is:
p
q
r
s
y
z
Given Sequences are equal: True
例 2:
// C# program to check the names of
// the employee are equal or not
using System;
using System.Linq;
using System.Collections.Generic;
// Employee details
public class Employee1 {
public int emp_id1
{
get;
set;
}
public string emp_name1
{
get;
set;
}
public string emp_lang1
{
get;
set;
}
}
// Employee details
public class Employee2 {
public int emp_id2
{
get;
set;
}
public string emp_name2
{
get;
set;
}
public string emp_lang2
{
get;
set;
}
}
public class GFG {
// Main method
static public void Main()
{
List<Employee1> emp1 = new List<Employee1>() {
new Employee1() {emp_id1 = 209, emp_name1 = "Anjita",
emp_lang1 = "C#"},
new Employee1() {emp_id1 = 210, emp_name1 = "Soniya",
emp_lang1 = "C"},
new Employee1() {emp_id1 = 211, emp_name1 = "Rohit",
emp_lang1 = "Java"},
};
List<Employee2> emp2 = new List<Employee2>() {
new Employee2() {emp_id2 = 209, emp_name2 = "Anjita",
emp_lang2 = "Scala"},
new Employee2() {emp_id2 = 210, emp_name2 = "Soniya",
emp_lang2 = "Python"},
new Employee2() {emp_id2 = 211, emp_name2 = "Rohit",
emp_lang2 = "Ruby"},
};
// Query to check the names of
// the employee are equal or not
// Using SequenceEqual method
var res = emp1.Select(e => e.emp_name1).SequenceEqual(emp2.Select(e => e.emp_name2));
Console.WriteLine(res);
}
}
Output:
True
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