Local functions are C# functions defined within the scope of a Razor code block (a code block enclosed in @{ … }). They allow you to encapsulate reusable logic directly in your views, making your view code more modular, organized, and easier to read.
Syntax and Features Declaration: Local functions are declared using the standard C# method syntax, typically within an @functions { … } block. Scope: They can only be called within the code block or section where they are defined. Parameters and Return Types: Local functions can take parameters and return values, just like regular C# methods. Accessibility: They are implicitly private to the view. Access to View Data: Local functions can access variables and model properties declared within the same code block.
Why Use Local Functions? Encapsulation: Group related logic into self-contained functions, improving code readability. Readability: Break down complex code into smaller, more manageable chunks. Reusability: Call local functions multiple times within the same view, avoiding code duplication. Cleaner Views: Reduce the amount of inline C# code scattered throughout your HTML markup.
Code @using ViewsExample.Models
@{ string appTitle = “Asp.Net Core Demo App”; List<Person> people = new List<Person>() { // … (person data) }; }
@functions { double? GetAge(DateTime? dateOfBirth) { if (dateOfBirth is not null) { return Math.Round((DateTime.Now – dateOfBirth.Value).TotalDays / 365.25); } else { return null; } }
int x = 10; // Example of a local variable
string Name { get; set; } = “Hello name”; // Example of a local property }
<!DOCTYPE html> <html> <head> <title>@appTitle</title> <meta charset=”utf-8″ /> </head> <body> <h1>Welcome to @Name</h1> @for (int i = 0; i < 2; i++) { Person person = people[i]; <div> @person.Name <span>, </span> <span>@person.PersonGender</span> @if (person.DateOfBirth != null) { <span>@person.DateOfBirth.Value.ToString(“MM/dd/yyyy”)</span> <span>@GetAge(person.DateOfBirth) years old</span> } </div> } </body> </html> In this code: Local Function: GetAge(DateTime? dateOfBirth) calculates the age of a person based on their date of birth. Local Variable: int x = 10; This is not used in the view but demonstrates how to declare local variables within a Razor code block. Local Property: string Name { get; set; } = “Hello name”; This is used to set the title of the page. The GetAge function is called within the @foreach loop to display the age of each person if their date of birth is available.
By
No Comments
Razor View Engine in ASP.NET Core MVC