Introduction
The module demonstrates string helper methods to pinpoint and extract the desired information.
Learning Objectives
Locate the position of a character or substring within another string
Retrieve segments of strings
Prerequisites for Developers
Basic familiarity with string helper methods
Basic understanding of while iteration statements
Proficiency in using Visual Studio or Visual Studio Code for C# code development, building, and execution
Getting Started
IndexOf method
Utilize the IndexOf() method to find the position of a single or multiple characters/strings within a larger string.
To begin, create a static class file called “StringMethods.cs” within the console application. Insert the provided code snippet into this file.
{
/// <summary>
/// Outputs
/// 13
/// 36
/// </summary>
public static void IndexOfExample()
{
string message = “Find what is (inside the parentheses)”;
int openingPosition = message.IndexOf(‘(‘);
int closingPosition = message.IndexOf(‘)’);
Console.WriteLine(openingPosition);
Console.WriteLine(closingPosition);
}
}
Execute the code from the main method as follows
StringMethods.IndexOfExample();
#endregion
Console Output
36
Substring method
Use the Substring() method to extract the part of the main string that comes after the specified character positions.
To do that add another method into the same static class as shown below
/// Outputs
/// (inside the parentheses
/// </summary>
public static void SubstringExample()
{
string message = “Find what is (inside the parentheses)”;
int openingPosition = message.IndexOf(‘(‘);
int closingPosition = message.IndexOf(‘)’);
int length = closingPosition – openingPosition;
Console.WriteLine(message.Substring(openingPosition, length));
}
Execute the code from the main method as follows
StringMethods.SubstringExample();
#endregion
Console Output
Skip the first character “(”
Simply update the starting index position using openingPosition += 1;To do that add another method into the same static class as shown below
/// Outputs
/// inside the parentheses
/// </summary>
public static void SubstringExample2()
{
string message = “Find what is (inside the parentheses)”;
int openingPosition = message.IndexOf(‘(‘);
int closingPosition = message.IndexOf(‘)’);
openingPosition += 1;
int length = closingPosition – openingPosition;
Console.WriteLine(message.Substring(openingPosition, length));
}
Execute the code from the main method as follows
StringMethods.SubstringExample2();
#endregion
Console Output
Complete Code on GitHub
GitHub — ssukhpinder/30DayChallenge.Net
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