Strings

Strings are immutable once they are created they cannot be changed
The functions that are used to modify string all return a new string (String is immutable) String methods can be chained one after the other

String Formatting

• String can be concatenated using the ”+” operator but this can get messy very quickly
• Instead we can make use of String.Format() to format a string as required
• String Interpolation can also be used for formatting string. Iet is created by adding $ before the string

string firstName = "John";
string lastName = "Smith";
 
string myName = firstName + " " + lastName;
string alsoMyName = string.Format("{0} {1}", firstName, lastName);
string alsoMyName2 = $"{firstName} {lastName}";
 
Console.WriteLine(myName);
Console.WriteLine(alsoMyName);

Standard numeric format strings | Microsoft Docs

Verbatim Strings

• They are string that output the value as it is special characters are not considered
• They are similar to raw strings/ triple quote strings in Python

string path = "C:\\Users\\David\\Downloads\\sample.txt";
string pathVerbatim = @"C:\Users\David\Downloads\sample.txt";
 
Console.WriteLine(path);
Console.WriteLine(pathVerbatim);

String Builder Class

• It is a class that is used to create Mutable String
• It is defined in the System.Text namespace
• It does not provide any of the String Searching Methods but in place of that provides String Manipulation Methods
• We are going to do a lot of manipulation of the data then string builder class should be used as they are faster and more efficient

var mutableString = new StringBuilder();
 
mutableString.Append('*', 10);
mutableString.AppendLine();
mutableString.Append('*', 10);
 
mutableString.Insert(0, "12345");
mutableString.Remove(0, 3);
 
Console.WriteLine(mutableString);
Console.WriteLine(mutableString[1]);