Elegant way parsing URL in C#

Elegant way parsing URL in C#

In C#, you can use the Uri class from the System namespace to parse a URL and extract its components. Here's an example:

using System; public class UrlParser { public string ParseUrl(string url, string component) { var uri = new Uri(url); switch (component.ToLower()) { case "protocol": return uri.Scheme; case "domain": return uri.Host; case "port": return uri.Port.ToString(); case "path": return uri.AbsolutePath; case "query": return uri.Query; case "fragment": return uri.Fragment; default: throw new ArgumentException($"Invalid component: {component}"); } } }

In this example, we create a UrlParser class that has a ParseUrl method that takes a URL and a component name as parameters. The method uses the Uri class to parse the URL and extract the requested component.

The ParseUrl method first creates a new Uri object from the URL string. It then uses a switch statement to determine which component to extract. The ToLower() method is used to make the component name case-insensitive.

The method returns the requested component as a string. If an invalid component name is passed in, the method throws an ArgumentException.

To use this method, you can create an instance of UrlParser and call the ParseUrl method, passing in a URL and a component name:

var parser = new UrlParser(); string url = "https://www.example.com:8080/path/to/page?query=value#fragment"; string component = "domain"; string value = parser.ParseUrl(url, component); Console.WriteLine($"{component}: {value}");

In this example, we create an instance of UrlParser, and use it to extract the domain component from the URL string. The output will be "domain: www.example.com".

Examples

  1. "C# parse URL components using Uri class"

    • Code:
      // Parse URL components using Uri class var uri = new Uri("https://www.example.com/path?query=value"); var scheme = uri.Scheme; var host = uri.Host; var path = uri.AbsolutePath; var query = uri.Query;
    • Description: Demonstrates using the Uri class to parse various components of a URL, such as scheme, host, path, and query.

  2. "C# parse query parameters from URL"

    • Code:
      // Parse query parameters from URL var uri = new Uri("https://www.example.com/path?param1=value1&param2=value2"); var queryParams = HttpUtility.ParseQueryString(uri.Query); var param1Value = queryParams["param1"]; var param2Value = queryParams["param2"];
    • Description: Illustrates using HttpUtility.ParseQueryString to parse query parameters from a URL.

  3. "C# extract path segments from URL"

    • Code:
      // Extract path segments from URL var uri = new Uri("https://www.example.com/path/segment1/segment2"); var pathSegments = uri.Segments.Skip(1).Where(s => !string.IsNullOrWhiteSpace(s)).ToArray();
    • Description: Shows how to extract path segments from a URL using the Segments property of the Uri class.

  4. "C# parse URL and handle invalid URL gracefully"

    • Code:
      // Parse URL and handle invalid URL gracefully Uri uri; if (Uri.TryCreate("https://www.example.com", UriKind.Absolute, out uri)) { // Use uri } else { // Handle invalid URL }
    • Description: Demonstrates using Uri.TryCreate to parse a URL and handle cases where the URL is invalid.

  5. "C# get domain from URL"

    • Code:
      // Get domain from URL var uri = new Uri("https://www.example.com/path"); var domain = uri.Host;
    • Description: Illustrates how to extract the domain from a URL using the Host property of the Uri class.

  6. "C# parse URL with query parameters into a dictionary"

    • Code:
      // Parse URL with query parameters into a dictionary var uri = new Uri("https://www.example.com/path?param1=value1&param2=value2"); var queryDictionary = HttpUtility.ParseQueryString(uri.Query) .AllKeys.ToDictionary(key => key, key => HttpUtility.UrlDecode(queryParams[key]));
    • Description: Demonstrates parsing a URL with query parameters into a dictionary for easy access to parameter values.

  7. "C# extract protocol and domain from URL"

    • Code:
      // Extract protocol and domain from URL var uri = new Uri("https://www.example.com/path"); var protocol = uri.Scheme; var domain = uri.GetLeftPart(UriPartial.Authority);
    • Description: Shows how to extract the protocol and domain from a URL using the Scheme property and GetLeftPart method.

  8. "C# extract filename from URL"

    • Code:
      // Extract filename from URL var uri = new Uri("https://www.example.com/path/filename.txt"); var filename = Path.GetFileName(uri.LocalPath);
    • Description: Illustrates how to extract the filename from a URL using the Path.GetFileName method.

  9. "C# parse URL with custom class for components"

    • Code:
      // Parse URL with custom class for components var urlParser = new UrlParser("https://www.example.com/path?query=value"); var scheme = urlParser.Scheme; var host = urlParser.Host; var path = urlParser.Path; var query = urlParser.Query;
    • Description: Demonstrates creating a custom class (e.g., UrlParser) to encapsulate URL components for more structured access.

  10. "C# parse URL and resolve relative paths"

    • Code:
      // Parse URL and resolve relative paths var baseUri = new Uri("https://www.example.com/base/path/"); var relativeUri = new Uri(baseUri, "relative/path");
    • Description: Shows how to parse a URL and resolve relative paths using the Uri constructor that takes a base URI.

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