ASP.NET Core Routing

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Questions and Answers

What is the purpose of the `{controller=Home}/{action=Index}/{id?}` route template?

To map URL paths to the Services controller action

To define a default route for the application (correct)

To enable attribute-based routing for the Home controller

To configure a custom route for the Index action

What is an example of a dedicated conventional route?

app.MapControllerRoute(name: "services", pattern: "services/{*service}"); (correct)

[HttpGet] public IActionResult Index()

app.MapControllerRoute(name: "default", pattern: "{controller=Home}/{action=Index}/{id?}");

[Route("services/{*service}")]

What is the purpose of attribute-based routing?

To specify route details at the controller and action level (correct)

To configure conventional routes in the Program.cs file

To enable HTTP method attributes for route configuration

To map URL paths to controller actions using route templates

What is the purpose of the `[Route]` attribute?

To specify a route template for a controller action Signup and view all the answers

What is the benefit of using conventional routing?

It simplifies the process of mapping URL paths to controller actions Signup and view all the answers

What is the purpose of the `pattern` parameter in the `MapControllerRoute` method?

To define the route template for a controller action Signup and view all the answers

What is the purpose of the Route attribute in the EmployeeDetailsController class?

To map actions to specific routes Signup and view all the answers

What is the route template for the GetDetails action?

Details/{id:int?} Signup and view all the answers

What is the URL for the Index action?

<a href="http://Server/Employee/Index">http://Server:PortNo/Employee/Index</a> Signup and view all the answers

What is the purpose of the HttpGet attribute on the Index action?

To specify the HTTP method for the action Signup and view all the answers

How does attribute-based routing differ from conventional routing?

Attribute-based routing uses route templates, while conventional routing uses route tables Signup and view all the answers

What is the URL for the GetEmployees action?

<a href="http://Server/EmployeeDetails/All">http://Server:PortNo/EmployeeDetails/All</a> Signup and view all the answers

What determines the controller class to execute in the default URL routing logic?

The first part of the URL Signup and view all the answers

What is the default action method executed when no action name is specified?

Index() Signup and view all the answers

What is the purpose of the third part of the URL in the default URL routing logic?

Passes route data Signup and view all the answers

What is the default route URL in the Program.cs file?

{controller=Home}/{action=Index}/{id?} Signup and view all the answers

What is the purpose of the ID parameter in the default route URL?

To pass optional route data Signup and view all the answers

How can you pass variables to be displayed on the page when the route cannot be used?

Using the query string Signup and view all the answers

What is the format of the query string used to pass variables to be displayed on the page?

?VariableName=Value&VariableName2=Value Signup and view all the answers

What is the role of the ASP.NET MVC model binding system in relation to the query string?

It maps the named parameters from the query string to parameters in the method Signup and view all the answers

Study Notes

Attribute-Based Routing

The [Route("Employee")] attribute is used to map the URL to the EmployeeDetailsController class.
Actions in the controller can be mapped to specific URLs using attributes like [HttpGet("Index")] or [Route("Details/{id:int?}")].
Multiple routes can be defined for the same action, allowing for flexible URL mapping.

Conventional-Based Routing

Conventional-based routing is configured in the Program.cs file.
Multiple routes can be defined using the app.MapControllerRoute method.
The pattern parameter specifies the URL pattern, and the defaults parameter specifies the default values for the controller and action.

Routing Basics

The default URL routing logic uses a format like /[Controller]/[ActionName]/[Parameters].
The first part of the URL determines the controller class to execute.
The second part of the URL determines the action method to execute.
The third part of the URL is for route data, and can be optional.

Custom Routing

Custom routes can be defined using the [Route] attribute or the app.MapControllerRoute method.
Custom routes can be used to map URLs to specific controller actions.

Lab 4.1 - Hello World: Routing

The default route URL is {controller=Home}/{action=Index}/{id?}.
When no URL segments are supplied, the default route maps to the Home controller and the Index action method.
The ID parameter is optional and can be used to pass data to the action method.

Lab 4.1 - Hello World: Query Strings

Query strings can be used to pass variables to the action method when the route cannot be used.
The ASP.NET MVC model binding system automatically maps named parameters from the query string to parameters in the method.
Query strings use the format ?VariableName1=Value&VariableName2=Value.

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Description

Learn about attribute-based routing in ASP.NET Core with the EmployeeDetailsController class, including mapping URLs to actions like Index. Understand how to configure routes for a controller.