Lesson #15 - The String Builder Class

The “string builder” class provides a better more efficient way to handle stings in our program. By using this class, we can reduce memory allocation that is used in case of changing string after creation (String is a ) ‘Mutable’, and therefore any modification will increase the memory allocation.


To use a “String Builder” class, we first need to create a new instance of the class, using one of the following options:


class Program

{

static void Main(string[] args)

{

//Example 1: Creating instance without initialization

StringBuilder Example_1 = new StringBuilder("String X");


//Example 2: Creating an instance and initialize it with a default value

StringBuilder Example_2 = new StringBuilder("String X");


//Example 3: Creating an instance with expected string length

StringBuilder Example_3 = new StringBuilder(5);


Console.ReadKey();

}

}


Builder Properties and Methods

Similar to any other class, the string builder class has its unique properties and methods. let's start to examine and demonstrate how can we use them in our code.


Append, AppendLine, and AppendFormat methods

These methods are used to add additional text to an initialized builder.


Example 1: Using the Append method to add syntax without moving to the next line


static void Main(string[] args)

{

StringBuilder PhoneNumber = new StringBuilder("My Name is : ");


//Adding values directly (Option 1)

PhoneNumber.Append("David\n");

PhoneNumber.Append("My Phone number: ");


//Adding values using loop (Option 2)

for (int i = 0; i < 9; i++)

{

PhoneNumber.Append(i);

}

Console.WriteLine(PhoneNumber);

Console.ReadKey();

}


Result:

My Name is: David

My Phone number: 012345678


Example 2: Using the Append Line method to add syntax and start a new line


class Program

{

static void Main(string[] args)

{

StringBuilder PhoneNumber = new StringBuilder("My Name is : ");


//Adding values directly (Option 1)

PhoneNumber.AppendLine("David");

PhoneNumber.AppendLine("My Phone number: ");


//Adding values using loop (Option 2)

for (int i = 0; i < 9; i++)

{

PhoneNumber.Append(i);

}

Console.WriteLine(PhoneNumber);

}

}


Result:

My Name is: David

My Phone number:

012345678


Example 3: Using the AppendFormat method to modify a specific part of the builder


static void Main(string[] args)

{

string BestMovieEver = "Rambo";

string BestTvShow = "Frainds";


StringBuilder FormatBuilder = new StringBuilder();

FormatBuilder.AppendFormat

(@"{0} is the Best Movie Ever!!!

{1} is the best Tv Show", BestMovieEver, BestTvShow);

Console.WriteLine(FormatBuilder);

}


Result:

Rambo 2 is the Best Movie Ever!!!

Friends is the best Tv Show!!!


Replace method

The replace method is used to change specific parts of a string.


static void Main(string[] args)

{

//Example 1:

StringBuilder ReplaceValue = new StringBuilder("My name is : None");

ReplaceValue.Replace("None", "David .T.");

Console.WriteLine("Example 1 : " + ReplaceValue);


//Example 2:

StringBuilder ReplaceMultipleValues = new StringBuilder("0-1-0-1-0-1-0");

ReplaceMultipleValues.Replace("0", "2");

Console.WriteLine("Example 2 : " + ReplaceMultipleValues);

}


Result:

Example 1: My name is: David .T.

Example 2: 2-1-2-1-2-1-2


Clear method

The ‘Clear’ method will clear the builder data.


static void Main(string[] args)

{

StringBuilder clearvalues = new StringBuilder("1984");

Console.WriteLine("Before : " + clearvalues);

clearvalues.Clear();

Console.WriteLine("After : " + clearvalues);

}


Result:

Before: 1984

After:


Remove method

This method is used to remove a specific range of characters based on builder indexes.


static void Main(string[] args)

{

StringBuilder Remove = new StringBuilder("123456789");

Console.WriteLine("Before : " + Remove);

Remove.Remove(6,1);


//Starting the remove from index 6

//Remove 1 character from index 6


Console.WriteLine("After : " + Remove);

}


Result:

Before: 123456789

After: 1234569





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