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Sorting a list of dictionaries by their values is a common requirement in C# programming. There are multiple approaches to achieve this, ranging from sorting by keys to sorting by values, and even sorting lists containing multiple dictionaries. Syntax Following is the syntax for sorting dictionary entries by values using LINQ − var sortedByValue = dictionary.OrderBy(x => x.Value); var sortedByValueDesc = dictionary.OrderByDescending(x => x.Value); For sorting by keys − var sortedByKey = dictionary.OrderBy(x => x.Key); Sorting Dictionary by Keys The simplest approach is to sort dictionary entries by their ... Read More
The Int16.GetTypeCode() method in C# is used to return the TypeCode for value type Int16. This method is part of the IConvertible interface and helps identify the underlying data type at runtime. The TypeCode enumeration provides a way to categorize the data types supported by the Common Language Runtime (CLR). For Int16 values, this method always returns TypeCode.Int16. Syntax Following is the syntax − public TypeCode GetTypeCode(); Return Value This method returns TypeCode.Int16, which is the enumerated constant representing the Int16 type. Using GetTypeCode() with Int16 Values Example Let ... Read More
To check if a string contains any special character in C#, you can use the Char.IsLetterOrDigit method. This method returns false for any character that is not a letter or digit, which means it's a special character. Special characters include symbols like @, #, $, %, &, punctuation marks, and whitespace characters that are not alphanumeric. Syntax Following is the syntax for checking if a character is a letter or digit − bool Char.IsLetterOrDigit(char c) To check for special characters, use the negation operator − if (!Char.IsLetterOrDigit(character)) { ... Read More
The Skip() method in C# LINQ is used to skip a specified number of elements from the beginning of a sequence and return the remaining elements. This method is particularly useful when you need to bypass certain elements in a collection before processing the rest. Syntax Following is the syntax for the Skip() method − public static IEnumerable Skip( this IEnumerable source, int count ) Parameters source − The sequence to return elements from. count − The number of elements ... Read More
In C#, finding the GCD (Greatest Common Divisor) and LCM (Least Common Multiple) of two numbers is a common mathematical programming task. The GCD is the largest positive integer that divides both numbers without remainder, while the LCM is the smallest positive integer that both numbers can divide evenly. These calculations are frequently used in mathematical applications, fraction simplification, and solving problems involving ratios and proportions. Mathematical Relationship There's an important mathematical relationship between GCD and LCM − GCD(a, b) × LCM(a, b) = a × b This means once we find the ... Read More
A case-insensitive Dictionary in C# allows you to perform key lookups without considering the case of string keys. This means keys like "cricket", "CRICKET", and "Cricket" are treated as identical. This is particularly useful when dealing with user input or data from external sources where case consistency cannot be guaranteed. Syntax To create a case-insensitive Dictionary, use the StringComparer.OrdinalIgnoreCase parameter in the constructor − Dictionary dict = new Dictionary(StringComparer.OrdinalIgnoreCase); You can also use other string comparers − // Culture-insensitive comparison Dictionary dict1 = new Dictionary(StringComparer.InvariantCultureIgnoreCase); // Current culture ignore case Dictionary ... Read More
The numeric (N) format specifier converts a number to a string with thousands separators and decimal places. It follows the pattern -d, ddd, ddd.ddd… where the minus sign appears for negative numbers, digits are grouped with commas, and decimal places are included. Syntax Following is the syntax for using the numeric format specifier − number.ToString("N") // Default 2 decimal places number.ToString("N0") // No decimal places number.ToString("Nn") ... Read More
While creating a password, you may have seen validation requirements on websites that ensure a password is strong and secure. Common password requirements include − Minimum 8 characters and maximum 14 characters At least one lowercase letter No whitespace characters At least one uppercase letter At least one special character Let us create a complete password validation program that checks all these conditions systematically. Complete Password Validation Program using System; using System.Linq; class PasswordValidator { public static bool IsValidPassword(string passwd) { ... Read More
Counting the number of lines in a file is a common task in C# programming. This can be accomplished using several methods from the System.IO namespace. The most straightforward approach is to use the File.ReadAllLines() method combined with the Length property. Using File.ReadAllLines() Method The File.ReadAllLines() method reads all lines from a file into a string array, and then we can use the Length property to count the total number of lines − Example using System; using System.IO; public class Program { public static void Main() { ... Read More
The SkipLast() method in C# LINQ is used to skip a specified number of elements from the end of a sequence and return the remaining elements. This method is particularly useful when you need to exclude the last few items from a collection. Syntax Following is the syntax for the SkipLast() method − public static IEnumerable SkipLast( this IEnumerable source, int count ) Parameters source − The sequence to skip elements from. count − The number of elements to skip from the end ... Read More