In LINQ, Concat method or operator is used to concatenate or append two collection elements into single collection and it does not remove duplicates from the two sequences.
Following is the pictorial representation of LINQ Concat method.
In above diagram two list elements combined into single collection.
Following is the syntax of using LINQ Concat method to combine two sequences into single sequence.
C# Code
var result = arr1.Concat(arr2);
VB.NET Code
Dim result = arr1.Concat(arr2)
If you observe above syntax we are concatenating two lists into single list.
Following is the example of LINQ Concat method.
C# Code
using System;
using System.Linq;
namespace Linqtutorials
{
class Program
{
static void Main(string[] args)
{
string[] arr1 = { "a", "b", "c", "d" };
string[] arr2 = { "c", "d", "e", "f" };
var result = arr1.Concat(arr2);
foreach (var item in result)
{
Console.WriteLine(item);
}
Console.ReadLine();
}
}
}
VB.NET Code
Module Module1
Sub Main()
Dim arr1 As String() = {"a", "b", "c", "d"}
Dim arr2 As String() = {"c", "d", "e", "f"}
Dim result = arr1.Concat(arr2)
For Each item In result
Console.WriteLine(item)
Next
Console.ReadLine()
End Sub
End Module
If you observe above example we are concatenating two sequences “arr1”, “arr2” into single sequence using LINQ Concat method.
Following is the result of LINQ Concat method example.
a
b
c
d
c
d
e
f
This is how we can use LINQ concat method to combine multiple sequences into single sequence in c#, vb.net.