How a C# lambda expression consist of a simple if statement, without needing braces?

How a C# lambda expression consist of a simple if statement, without needing braces?

In C#, a lambda expression can consist of a simple if statement without needing braces if the if statement consists of a single expression.

For example, consider the following lambda expression:

int result = numbers.Sum(x => x % 2 == 0 ? x : 0);

In this example, the Sum method of the numbers collection is used to sum up all even integers. The lambda expression passed to the Sum method uses a simple if statement to conditionally include the current integer in the sum.

The lambda expression consists of a single expression, which is the conditional operator (? :). The conditional operator evaluates the condition x % 2 == 0 and returns the value of x if the condition is true, or 0 if the condition is false.

Because the lambda expression consists of a single expression, the braces {} are not needed. If the lambda expression consisted of multiple statements or expressions, braces would be needed to group them together as a single block.

Examples

  1. Simple Lambda Expression with If Statement

    • Description: Users may search for a basic example of a C# lambda expression containing a simple if statement without braces.
    • Code:
      // Simple Lambda Expression with If Statement Action<int> printIfPositive = x => if (x > 0) Console.WriteLine(x);

  2. Lambda Expression with Conditional Operator

    • Description: Developers might want to use the conditional (ternary) operator within a lambda expression instead of an if statement.
    • Code:
      // Lambda Expression with Conditional Operator Action<int> printIfPositive = x => Console.WriteLine(x > 0 ? x : 0);

  3. Lambda Expression with Multiple Conditions

    • Description: Users may search for a lambda expression with multiple conditions using logical operators.
    • Code:
      // Lambda Expression with Multiple Conditions Action<int> printCategory = x => Console.WriteLine(x > 0 && x < 10 ? "Single Digit" : "Other");

  4. Lambda Expression with Single Statement If

    • Description: Developers might want to see how to use a single-statement if without braces in a lambda expression.
    • Code:
      // Lambda Expression with Single Statement If Action<int> printPositive = x => if (x > 0) Console.WriteLine("Positive");

  5. Lambda Expression with Single Statement If-Else

    • Description: Users may be interested in a lambda expression with a single statement for both if and else cases.
    • Code:
      // Lambda Expression with Single Statement If-Else Action<int> printSign = x => Console.WriteLine(x > 0 ? "Positive" : "Non-Positive");

  6. Lambda Expression with Nullable Type Check

    • Description: Developers might want to use a lambda expression to check if a nullable type has a value.
    • Code:
      // Lambda Expression with Nullable Type Check Action<int?> printValue = x => if (x.HasValue) Console.WriteLine(x.Value);

  7. Lambda Expression with Method Call in If Statement

    • Description: Users may search for examples of lambda expressions calling a method within an if statement.
    • Code:
      // Lambda Expression with Method Call in If Statement Action<int> printSquare = x => if (x > 0) PrintSquare(x); private static void PrintSquare(int x) { Console.WriteLine(x * x); }

  8. Lambda Expression with Object Initialization in If

    • Description: Developers might want to initialize an object within an if statement in a lambda expression.
    • Code:
      // Lambda Expression with Object Initialization in If Action<int> initializePerson = age => if (age > 0) new Person { Age = age }; public class Person { public int Age { get; set; } }

  9. Lambda Expression with Collection Filtering

    • Description: Users may be interested in using a lambda expression to filter a collection based on a condition.
    • Code:
      // Lambda Expression with Collection Filtering List<int> numbers = new List<int> { 1, 2, 3, 4, 5 }; var positiveNumbers = numbers.Where(x => x > 0).ToList();

  10. Lambda Expression with Inline Condition

    • Description: Developers might want to use an inline condition within a lambda expression without using if statements.
    • Code:
      // Lambda Expression with Inline Condition Func<int, string> categorize = x => x > 0 ? "Positive" : "Non-Positive";

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