Intersect two Arrays

The Array class provides methods for creating, manipulating, searching, and sorting arrays. The Array class is not part of the System.Collections namespaces. However, it is still considered a collection because it is based on the IList interface. An element is a value in an Array. The length of an Array is the total number of elements it can contain. The Array has a fixed capacity.

The following .net c# tutorial code demonstrates how we can intersect two array instances. But there is no built-in method in the Array class two intersect two Array objects. So in this .net c# tutorial code, we will use Enumerable Intersect() method to intersect two Array instances. Here we will intersect two integer-type Array instances.

The Enumerable Intersect() method produces the set intersection of two sequences. This method is located under System.Linq namespace. The Enumerable Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) method overload produces the set intersection of two sequences by using the default equality comparer to compare values.

The Intersect(first, second) method’s first parameter is an IEnumerable<T> whose distinct elements that also appear in the second will be returned. The second parameter is an IEnumerable<T> whose distinct elements that also appear in the first sequence will be returned.

The Enumerable Intersect() method returns a sequence that contains the elements that form the set intersection of two sequences. The Intersect(first, second) method throws ArgumentNullException if the first or second is null.

The following .net c# tutorial code demonstrates how we can intersect two array instances. But there is no built-in method in the Array class two intersect two Array objects. So in this .net c# tutorial code, we will use Enumerable Intersect() method to intersect two Array instances. Here we will intersect two integer-type Array instances.

The Enumerable Intersect() method produces the set intersection of two sequences. This method is located under System.Linq namespace. The Enumerable Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) method overload produces the set intersection of two sequences by using the default equality comparer to compare values.

The Intersect(first, second) method’s first parameter is an IEnumerable<T> whose distinct elements that also appear in the second will be returned. The second parameter is an IEnumerable<T> whose distinct elements that also appear in the first sequence will be returned.

The Enumerable Intersect() method returns a sequence that contains the elements that form the set intersection of two sequences. The Intersect(first, second) method throws ArgumentNullException if the first or second is null.

array-intersect.aspx

```
<%@ Page Language="C#" AutoEventWireup="true"%>
<!DOCTYPE html>
<script runat="server">
protected void Button1_Click(object sender, System.EventArgs e)
{
int[] numbers = { 10,50,75};
int[] morenumbers = { 50,65,75,400};
Label1.Text = "numbers array.........<br />";
foreach (int i in numbers)
{
Label1.Text += i.ToString() + "<br />";
}
Label1.Text += "<br />more numbers array.........<br />";
foreach (int i in morenumbers)
{
Label1.Text += i.ToString() + "<br />";
}
var intersect = numbers.Intersect(morenumbers);
Label1.Text += "<br />intersect of numbers array and more numbers array.........<br />";
foreach (int i in intersect)
{
Label1.Text += i.ToString() + "<br />";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>c# example - array intersect</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:DarkBlue; font-style:italic;">
c# example - array intersect
</h2>
<hr width="550" align="left" color="LightBlue" />
<asp:Label
ID="Label1"
runat="server"
Font-Size="Large"
>
</asp:Label>
<br />
<asp:Button
ID="Button1"
runat="server"
Text="array intersect"
OnClick="Button1_Click"
Height="40"
Font-Bold="true"
/>
</div>
</form>
</body>
</html>
```

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