Using Razor Pages ASP.Net Core, I have some functions that I'd like to use on every page. I guess this used to be done with App_Code, but that no longer seems to work in Core. How can I accomplish this in Asp.Net Core Razor Pages?
How can I add a function that all Razor Pages can access?
Asked Answered
would Service Injection work for you? learn.microsoft.com/en-us/aspnet/core/mvc/views/… –
Kimsey
Option 1 - DI
1 - Create the service class with the relevant functionality
public class FullNameService
{
public string GetFullName(string first, string last)
{
return $"{first} {last}";
}
}
2- Register the service in startup
services.AddTransient<FullNameService>();
3- Inject it to the razor page
public class IndexModel : PageModel
{
private readonly FullNameService _service;
public IndexModel(FullNameService service)
{
_service = service;
}
public string OnGet(string name, string lastName)
{
return _service.GetFullName(name, lastName);
}
}
Option 2 - Base Model
1- Create a base page model with the function
public class BasePageModel : PageModel
{
public string GetFullName(string first, string lastName)
{
return $"{first} {lastName}";
}
}
2- Derive other pages from the base model
public class IndexModel : BasePageModel
{
public string OnGet(string first, string lastName)
{
return GetFullName(first, lastName);
}
}
Option 3 - Static Class
1- Use a static function that can be accessed from all pages
public static class FullNameBuilder
{
public static string GetFullName(string first, string lastName)
{
return $"{first} {lastName}";
}
}
2- Call the static function from the razor page
public class IndexModel : PageModel
{
public string OnGet(string first, string lastName)
{
return FullNameBuilder.GetFullName(first, lastName);
}
}
Option 4 - Extension Methods
1- Create an extension method for a specific type of objects (e.g. string)
public static class FullNameExtensions
{
public static string GetFullName(this string first, string lastName)
{
return $"{first} {lastName}";
}
}
2- Call the extension from razor page
public class IndexModel : PageModel
{
public string OnGet(string first, string lastName)
{
return first.GetFullName(lastName);
}
}
I'd add one more solution
Option 5 - inheritance
Define generic class which inherits from
RazorPage<TModel>public abstract class MyBasePage : RazorPage
Make all view inheriting from it in
_ViewImports.cshtml@inherits MyBasePage
Define methods (an other members) in the class (protected accessibility is enough) an use them from CSHTML
e.g.
definition
protected string? PageClass { get => ViewData["PageClass"] as string; set => ViewData["PageClass"] = value; }
usage
@{
Title = "Error";
}
or
<head>
<title>@Title</title>
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