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C# Professional - Processing Text

Next: Regular Expressions - Basics

Strings and Encoding


String is a type from the System namespace that is used for most of text related operations.

The String type has some specificities compared to other types:

  • It is a reference type
  • It is immutable, meaning that you cannot change the value of a String
  • It behaves like a value type


Encoding is used to specify:

  • How text is stored in memory
  • How text is displayed on screen

The Encoding type offers multiple common encodings:

  • Default (avoid using this one)
  • Unicode
  • UTF7
  • UTF8
  • UTF32

Text in String instances is stored using Unicode 16. You can include specific Unicode characters in a String using the syntax \u03a0 (here it is the pi character for exemple).

// { autofold
using System;
using System.Text;
class Example
static void Main()
// }
string unicodeString = "Maths use \u03a0 (Pi) for calculations";

Building Strings

As we saw before, String is immutable, which implies that every time you want to modify a String, a new instance will be created. If you have an important number of modifications to do, this can cause a big memory consumption and pressure on the memory.

In order to avoid this scenario, the .Net Framework propose the StringBuilderclass, which is designed for handling such scenarios.

// { autofold
using System;
using System.Text;
using System.Collections.Generic;
class Car
public string Model { get; set; }
public string Brand { get; set; }
public int Year { get; set; }
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