C# – String Type

String Type

Overview

• System.String
• Immutable sequence of Unicode characters
• Specified in double quotes
• Is reference type
• Escape sequence valid for char literals work inside strings

  eg string a = "Here's a tab:\t";

• Whenever backslash is needed you need to write twice

  string a1 = "\\\\server\\fileshare\\helloworld.cs";

Verbatim String Literals

• C# allows verbatim string literals, prefixed with @ and does not support escape sequence

  eg: string a2 = @ "\\server\fileshare\helloworld.cs";

• Include double-quote character in a verbatim literal by writing twice

  string xml = @"";

String concatenation

• + operator concatenates two strings

  string s = "a" + "b";

• If one of the value is non string, ToString() method is called on the value

  string s = "a" + 5; // a5

Better solution to use:
System.Text.StringBuilder

String interpolation (C# 6)

String preceded with the $ character is called an interpolated string

Interpolated strings can include expressions inside braces

int x = 4;
Console.Write ($"A square has {x} sides"); // Prints: A square has 4 sides

To change the format

string s = $"255 in hex is {byte.MaxValue:X2}"; // X2 = 2-digit Hexadecimal
// Evaluates to "255 in hex is FF"

int x = 2;
string s = $@"this spans {
x} lines";

String comparisons

Use CompareTo() method