C# Version HisotryC# Language FeaturesInstalling Visual StudioC# Basic Project StructureHello Wolrd, first C# program
Variables in C# Explicitly typed variables in C#Implicitly typed variables in C#Constants in C#Data types in C#Integral data types in C#Floating-point data types in C#Comparison between Float, Double and DecimalChar data type in C#String data type in C#Boolean data type in C#DateTime data type in C#Enumeration data type in C#Array data type in C#Object data type in C#Dynamic data type in C#Anonymous data type in C#Nullable data type in C#Type casting in C#Type safety in C#Literals in C#Operators in C#Ternary Operator in C#Null coalescing Operator in C#Tilde(~) Operator in C#Keywords in C#Namespace in C#Nullable Types in C#Nullable Helper Class in C#Characteristics of Nullable typesC# Difference between "int" and "int?"
Block statement in C#Empty statement in C#Jump statements in C#Break statement in C#Continue statement in C#Difference between continue and breakGoto statement in C#Return statement in C#Throw statement in C#Yield keyword in C#Checked statement in C#Unchecked statement in C#Lock statement in C#Using statement in C#Enum/Enumeration in C#If-Else statement in C#Switch statement in C#What is a loop in C#?For loop in C#While loop in C#Do while loop in C#Foreach loop in C#Nested loop in C#Infinite loop in C#
C# Method or FunctionC# Method Parameters and ArgumentsC# Method OverloadingC# Return StatementsC# Static vs. Instance MethodsC# Method ModifiersC# Method Signatures and Naming ConventionsC# Function Documentation and CommentsC# Value Type ParametersC# Ref Type ParametersDifference between Value and Ref TypeC# Out ParametersDifference between Ref and out parametersC# Optional parametersAre Nullable types reference types in C#"
Exception Handling in C#Types of exception in C#Try catch finally in C#finally block in C#try block without catch blockMultiple catch blocks in exceptionCatch multiple exceptions in C#Base class of exception in C#finally block execution in C#finally block execution in case of errorFinally and return statementWays to use try-catch-finallyException throw from finally block"throw" and "throw ex" in C#Differene between finalize() and finallyInner exception in C#Error types in C#Catch multi exception by single catch blockUser defined/custom excetion in C#Compile and run time exception in C#Difference between "error" and "exception"System and application exception in C#Exception handling abuse in c#?
C# String BasicsC# String ManipulationC# String FormattingC# String Comparison and SearchingC# StringBuilder ClassC# Regular ExpressionsC# Unicode and EncodingC# String Parsing and ConversionDifference between "string" and "String"C# String Escape SequenceC# Mutable and Immutable ConceptProve that string is immutableString value stored in memoryDifference between string and stringbuilderOverride the tostring() method
Enum/enumeration in C#Can you inherit enum in C#?Convert enum to stringConvert enum to list in C#Cast int value to enum in C#Get int value from enum in C#Convert string to enum in C#Usage of enum in switch case statementLoop through all enum valuesUse tilde(~) with Enum
Main() method basics in C#More than one "Main()" method in C#Static Main() method in C#Overload Main() method in C#Override Main() method in C#Access modifiers of Main() method in C#Non-static method in C#Main() method arguments and return typeasync Main() method in C#Class without Main() method in C#Main() method rules in C#
Recursion in C#Base condition in recursion in C#Recursive Algorithms in C#Tree traversal using recursion in C#Stack overflow error in recursionBack tracking using recursionIndirect recursion in C#Recursive data structures in C#Tail Recursion in C#Recursive problem solvingRecursion vs Iteration
C# File and File InfoC# StreamReader and StreamWriterC# FileStream and BinaryReader/BinaryWriterC# Directory and DirectoryInfo ClassesC# File PathsC# File and Directory OperationsC# File Exceptions and Error HandlingC# File Serialization and DeserializationC# File System Watcher
What is array?Single dimension arrayMulti dimension arrayJagged arrayParam arrayArray with multi data typesDifferent data types from object arrayArray with non-default valuesArray methods and propertiesArray manipulation techniquesArray sorting algorithmsArray Searching algorithms(linear, binary search)Array finding maximum and minimumArray of Reference Types
C# GenericsC# Generic Constraints
C# ArrayListC# Array vs ArrayListC# ListC# SortedListC# DictionaryC# HashtableC# Dictionary vs HashtableC# HashSetC# Hashtable vs HashSetC# StackC# Queue
C# IEnumerableC# IEnumeratorC# ICollectionC# IListC# IDictionaryC# IDisposableC# IComparableC# IEquatableC# ICloneableC# IQueryableC# INotifyPropertyChangedC# INotifyCollectionChangedC# IFormattableC# IAsyncResultC# IComparerC# IEqualityComparerC# IHttpHandlerC# IHttpModule
C# DelegatesC# Single-Cast DelegateC# Multi-Cast DelegateC# Generic DelegatesC# Func DelegateC# Action DelegateC# Predicate DelegateC# Anonymous MethodsC# EventsDifference Between Event & DelegateDifference Between Interface & DelegateC# Covariance and Contravariance
Previous
Next

String Comparison and Searching

In C#, string comparison and searching are common operations used to determine if one string is equal to, comes before, or comes after another string, as well as to locate substrings within a larger string. C# provides several methods for performing these tasks. Here are some of the key methods:

1. String Comparison:
•'string.Equals': The 'Equals' method compares two strings for equality and returns a 'Boolean' value indicating whether they are equal or not. 


string str1 = "Hello";
string str2 = "hello";

bool areEqual = str1.Equals(str2, StringComparison.OrdinalIgnoreCase);
Console.WriteLine(areEqual); // Output: True (ignoring case)

•'string.Compare': The 'Compare' method compares two strings and returns an integer that indicates their relative position in lexicographic order. 


string str1 = "apple";
string str2 = "banana";

int result = string.Compare(str1, str2, StringComparison.OrdinalIgnoreCase);

if (result < 0)
    Console.WriteLine("str1 comes before str2.");
else if (result > 0)
    Console.WriteLine("str1 comes after str2.");
else
    Console.WriteLine("str1 and str2 are equal.");

2. String Searching:
•'string.Contains': The 'Contains' method checks if a substring exists within a string and returns a 'Boolean' value indicating the result. 


string sentence = "The quick brown fox jumps over the lazy dog.";

bool containsFox = sentence.Contains("fox");
Console.WriteLine(containsFox); // Output: True

•'string.IndexOf': The 'IndexOf' method returns the index of the first occurrence of a substring within the string. If the substring is not found, it returns -1. 


string sentence = "The quick brown fox jumps over the lazy dog.";

int index = sentence.IndexOf("fox");
Console.WriteLine(index); // Output: 16

•'string.LastIndexOf': The 'LastIndexOf' method is similar to 'IndexOf' but searches for the last occurrence of the substring within the string. 


string sentence = "The quick brown fox jumps over the lazy dog.";

int lastIndex = sentence.LastIndexOf("o");
Console.WriteLine(lastIndex); // Output: 40

•'string.StartsWith' and 'string.EndsWith': These methods check if a string starts or ends with a specific substring and return a 'Boolean' value. 


string fileName = "example.txt";

bool startsWithEx = fileName.StartsWith("ex");
Console.WriteLine(startsWithEx); // Output: True

bool endsWithTxt = fileName.EndsWith(".txt");
Console.WriteLine(endsWithTxt); // Output: True

•'string.Substring': The 'Substring' method extracts a portion of a string based on a start index and optional length. 


string sentence = "The quick brown fox jumps over the lazy dog.";

string subString = sentence.Substring(16, 3);
Console.WriteLine(subString); // Output: "fox"

These methods allow you to perform various string comparison and searching tasks in C#. Depending on your specific use case, you can choose the appropriate method to determine if strings are equal, compare their positions, or locate substrings within larger strings.

Previous
Next