在LINQ中，Set运算符是查询表达式中的那些运算符，它们返回结果集，该结果集基于相同或不同集合或序列或集中同等元素的存在或不存在。标准查询运算符包含以下集合运算符：
- 联盟
- 相交
- 除了
- 清楚的
相交算子
“相交”运算符返回设置的相交。换句话说，我们可以说它返回了包含两个集合或集合中包含的公共元素的集合或集合。
- 它不支持C＃和VB.Net语言的查询语法。但是您可以对查询变量使用Intersect方法，也可以将查询括在方括号中，然后调用Intersect方法。
- 它支持C＃和VB.Net语言的方法语法。
- 它同时存在于Queryable和Enumerable类中。
- 它是通过使用延迟执行来实现的。
- 使用复杂类型的集合时，必须使用IEqualityComparer接口，否则Intersect方法将为您提供错误的结果。
范例1：
// C# program to find the intersection
// of the given sequence
using System;
using System.Linq;
class GFG {
static public void Main()
{
// Data source
char[] sequence1 = {'m', 'q', 'o',
's', 'y', 'a'};
char[] sequence2 = {'p', 't', '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);
}
// Get intersection of the given sequence
// Using Intersect function
var result = sequence1.Intersect(sequence2);
Console.WriteLine("New Sequence: ");
foreach(var val in result)
{
Console.WriteLine(val);
}
}
}
输出：
Sequence 1 is:
m
q
o
s
y
a
Sequence 2 is:
p
t
r
s
y
z
New Sequence:
s
y
范例2：
// C# program to find the commonly
// known languages by the employees
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 emp1 = new List() {
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 emp2 = new List() {
new Employee2() {emp_id2 = 290, emp_name2 = "Anjita",
emp_lang2 = "C#"},
new Employee2() {emp_id2 = 212, emp_name2 = "MaMa",
emp_lang2 = "Python"},
new Employee2() {emp_id2 = 233, emp_name2 = "Rima",
emp_lang2 = "Java"},
};
// Query to find the commonly known
// languages by the employees
// Using Intersect method
var res = emp1.Select(e => e.emp_lang1).Intersect(emp2.Select(e => e.emp_lang2));
Console.WriteLine("Commonly known Languages: ");
foreach(var val in res)
{
Console.WriteLine(val);
}
}
}
输出：
Commonly known Languages:
C#
Java