ASP.NET Core Routing

20 Questions

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

To define a default route for the application

What is an example of a dedicated conventional route?

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

What is the purpose of attribute-based routing?

To specify route details at the controller and action level

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

To specify a route template for a controller action

What is the benefit of using conventional routing?

It simplifies the process of mapping URL paths to controller actions

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

To define the route template for a controller action

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

To map actions to specific routes

What is the route template for the GetDetails action?

Details/{id:int?}

What is the URL for the Index action?

http://Server:PortNo/Employee/Index

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

To specify the HTTP method for the action

How does attribute-based routing differ from conventional routing?

Attribute-based routing uses route templates, while conventional routing uses route tables

What is the URL for the GetEmployees action?

http://Server:PortNo/EmployeeDetails/All

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

The first part of the URL

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

Index()

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

Passes route data

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

{controller=Home}/{action=Index}/{id?}

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

To pass optional route data

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

Using the query string

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

?VariableName=Value&VariableName2=Value

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

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.

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.

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