Hello Folks, Welcome to the Pal Tech Academy blog, here you will learn several Technologies.In this tutorials, we will try to explain about dot net technology, Asp.net core, C#, SQL Server, jQuery , Digital Marketing, Interview preparation for dotnet and Many More.
What is computer?
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A computer is an electronic device that processes data using instructions stored in its memory, enabling it to perform various tasks, calculations, and functions.
In SQL, `UNION` and `MINUS` are set operators used to combine or compare the results of two or more queries. 1. UNION: The `UNION` operator is used to combine the results of two or more `SELECT` statements into a single result set. It removes duplicate rows from the result set by default. The column names and data types of the result columns must match in all `SELECT` statements being combined. Here's a basic syntax: -----sql SELECT column1, column2, ... FROM table1 UNION SELECT column1, column2, ... FROM table2; ----- This query retrieves rows from `table1` and `table2`, combines the results, and removes any duplicate rows. 2. MINUS (also known as `EXCEPT` in some database systems): The `MINUS` operator is used to subtract the result set of one `SELECT` statement from the result set of another `SELECT` statement. It returns rows that are present in the first query...
In ASP.NET Core Web APIs, authentication filters provide a powerful mechanism to secure your API endpoints. Here's a breakdown specifically for .NET Core: How it Works: Pipeline Integration: When a request hits your Web API, it goes through a series of processing stages called the pipeline. Authentication filters are registered within this pipeline. Filter Activation: Depending on the scope (global, controller, or action), specific filters are triggered for each request. Credential Validation: The filter inspects the request for credentials based on the configured authentication scheme. This could involve: Headers: Examining specific headers for API keys or tokens. Body: Checking for username and password combinations in the request body (common for basic authentication). Other Mechanisms: Depending on the scheme, credentials might be retrieved from cookies or URL parameters. IPrincipal Creation: If credentials are valid according to the filter's logic,...
Custom filters in ASP.NET Core Web APIs offer a powerful way to implement specific authentication logic beyond what built-in filters provide. Here's a breakdown of how to create and use them: Creating Custom Authentication Filters: 1. Inheritance: Your custom filter class typically inherits from AuthorizeAttribute or the IAuthorizationFilter interface. AuthorizeAttribute: This is a simpler approach if your filter primarily relies on properties from the base class (like Roles or AuthenticationSchemes). IAuthorizationFilter: This interface offers more control over the authorization process. You'll need to implement the OnAuthorization method to perform custom validation logic. 2. Custom Validation Logic: Within the OnAuthorization method (for IAuthorizationFilter ) or using properties like Roles and AuthenticationSchemes (for AuthorizeAttribute ), implement your authentication logic. This logic might involve: ...
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