Convert array, string

A string array can be converted into a string. We can store many values in a single string. There are several ways of combining the array of strings.

We consider conversion methods: one way uses the string.Join method—this is probably the simplest. Other ways use iteration in a loop.

Join example

This version uses the string.Join method to convert the array to a string. This can be faster than StringBuilder. It is shorter code.

using System;

// Part 1: create an array.
string[] array = new string[3];
array[0] = "orange";
array[1] = "peach";
array[2] = "apple";

// Part 2: call string.Join.
string result = string.Join(".", array);
Console.WriteLine($"RESULT: {result}");
RESULT: orange.peach.apple

StringBuilder

This code uses a StringBuilder instance to convert the array to a string. This technique is ideal when we need to loop over a string array before adding the elements.

using System;
using System.Text;

// Create an array.
string[] array = new string[] { "cat", "frog", "bird" };

// Concatenate all the elements into a StringBuilder.
StringBuilder builder = new StringBuilder();
foreach (string value in array)
{
    builder.Append(value);
    builder.Append('.');
}
string result = builder.ToString();
Console.WriteLine($"RESULT: {result}");
RESULT: cat.frog.bird.

Notes, method usage

If string.Join fits our requirements, it is the best choice. But if we have more complex needs, using StringBuilder may be better, as it gives us more control.

We converted string arrays into strings. We can use StringBuilder or the string.Join method. We noted many other common tasks and solutions with converting strings.