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

C# - Checked statement

In C#, the checked statement is used to explicitly enable overflow checking for arithmetic operations, ensuring that arithmetic operations do not result in overflow errors. When the checked statement is used, C# will throw an exception if an overflow occurs, allowing you to handle the situation gracefully.

Here's a simple explanation with a code example:


using System;

class Program
{
    static void Main()
    {
        int x = int.MaxValue; // Maximum value for an int
        int y = 1;

        // Without checked, this would cause an overflow
        int result;

        checked
        {
            result = x + y; // This will throw an OverflowException
        }

        Console.WriteLine($"The result is: {result}");
    }
}

C# Checked Statement Output

The output of the provided C# program that uses the checked statement will be an OverflowException because the addition operation exceeds the maximum value an int can hold.

Here's the expected output:


Unhandled exception. System.OverflowException: Arithmetic operation resulted in an overflow.
at Program.Main() in C:\Your\Path\To\Program.cs:line 13

The program will terminate abruptly due to the unhandled exception caused by the overflow during the addition operation.

Explanation of the code:

  • In this example, we have two integers, x and y.
  • x is assigned the maximum value for an int using int.MaxValue.
  • We attempt to add x and y, which would cause an overflow because the sum exceeds the maximum value an int can hold.
  • To enable overflow checking explicitly, we use the checked statement. Inside the checked block, the addition operation will throw an OverflowException when an overflow occurs.
  • We catch the exception and handle it gracefully, preventing the program from crashing.

As you can see, the checked statement detected the overflow condition and threw an exception, allowing us to handle it gracefully instead of silently causing unexpected behavior in our program.

Best Practices for Using the 'checked' Statement

  1. Use checked When Necessary: Use the checked statement when you anticipate potential overflow issues in arithmetic operations. It's best to apply it selectively to specific blocks of code where overflow checking is required, rather than enabling it globally.
  2. Clearly Document Intent: Include comments or documentation to explain why you are using the checked statement in specific code blocks. This helps other developers understand your reasoning.
  3. Wrap Only Risky Operations: Wrap the checked statement around specific arithmetic operations that are likely to cause overflow. This avoids unnecessary performance overhead for operations where overflow is not a concern.
  4. Handle Exceptions Gracefully: Always enclose the checked block in a try-catch block to catch and handle potential OverflowException exceptions. Provide meaningful error messages to assist with debugging.
  5. Testing and Validation: Test your code thoroughly, including scenarios where overflow might occur. Ensure that your code behaves as expected and handles overflows gracefully.
  6. Consider Alternative Approaches: In some cases, using data types that can accommodate larger values (e.g., long instead of int) or implementing custom checks may be a better approach than relying on the checked statement.
  7. Review Code Regularly: During code reviews, pay attention to the use of the checked statement. Verify that it is used appropriately and that the code is well-documented.
  8. Keep Performance in Mind: Be aware that enabling overflow checking using the checked statement can have a performance impact. Assess whether the benefits of overflow checking outweigh the potential performance trade-offs.
  9. Avoid Overusing unchecked: C# also provides the unchecked statement to explicitly disable overflow checking. Avoid using unchecked indiscriminately, as it can lead to unexpected behavior. Use it sparingly and only when you are confident that overflow is not a concern.
  10. Stay Informed: Keep up-to-date with C# language updates and best practices for handling numeric operations. C# evolves, and new features or recommendations may emerge.
Previous
Next