LINQ (Language Integrated Query) lets you work with data (like arrays and lists) using simple, readable queries.
📝 Why Use LINQ?
- Write less code to filter, sort, and search data.
- Works with lists, arrays, and even databases.
📋 Basic Example
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int[] numbers = { 1, 2, 3, 4, 5 };
var evens = numbers.Where(n => n % 2 == 0);
foreach (var n in evens)
Console.WriteLine(n); // 2, 4
🔍 LINQ Syntax Options
- Method syntax:
list.Where(...) - Query syntax: Like SQL!
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var bigNumbers = from n in numbers
where n > 3
select n;
🌟 Common LINQ Methods
Where— filterSelect— project/transformOrderBy— sortFirstOrDefault— first value or default
💡 Try It!
Find the names that start with “A”:
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string[] names = { "Alice", "Bob", "Anna" };
var aNames = names.Where(name => name.StartsWith("A"));
foreach (var name in aNames)
Console.WriteLine(name);
Next: Filtering, ordering, and projecting with LINQ!
