Flurl C#（對開發者如何理解的工作）

Fluent Interface

The fluent, chainable syntax provided by Flurl enhances program readability and maintainability. Developers can create simple and expressive HTTP requests and work with URLs, query parameters, headers, and payloads.

HTTP Method Support

All standard HTTP methods, including GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS, are supported. Developers can accomplish various tasks when working with web APIs thanks to this all-inclusive support approach.

Query Parameter Handling

Flurl offers easy ways to modify, add, and remove query parameters within URLs. It makes it easier to create dynamic URLs based on user input or runtime situations.

JSON Support

JSON data handling is supported natively by Flurl. It can easily deserialize JSON responses into C# objects and serialize objects to JSON for request payloads. Because of this, utilizing JSON-based APIs is simple and easy.

Form Data and Multipart Support

It makes managing multipart requests and form data easier. Flurl makes it simple for developers to include multipart/form-data payloads or form-encoded data in HTTP requests.

Error Handling and Retry Policies

Flurl offers retry policy definition and error-handling capabilities for all HTTP calls. By defining unique error-handling logic or retry techniques, developers can enhance the resilience and dependability of API calls and interactions. This also safeguards and helps developers prevent anonymous object errors in responses.

Authentication

It supports several popular authentication methods for web APIs, including OAuth, custom authentication schemes, Basic Authentication, and API keys. This ensures secure communication with authentication-required APIs.

Testing Support

By isolating HTTP-related logic into reusable components with a distinct separation of concerns, Flurl encourages testability. This makes writing unit tests for API interactions simpler, as no real network calls are required to test them.

Configuration Flexibility

It provides configuration flexibility for HTTP clients and request parameters. Developers can change client behaviors, timeouts, error response amounts, headers, and other settings to meet the needs of particular applications or API limitations.

可擴展性

Because of its framework for plugins, Flurl is very extendable. Developers can increase the platform's functionality by building unique extensions or incorporating third-party plugins for more features.

Create a New Visual Studio Project

Install-Package Flurl.Http

using Flurl;
using Flurl.Http;

// Configure a FlurlClient instance with base URL and headers
FlurlClient flurlClient = new FlurlClient("https://api.example.com/");
flurlClient.WithHeader("Authorization", "Bearer YourAccessTokenHere");

using Flurl;
using Flurl.Http;

// Configure a FlurlClient instance with base URL and headers
FlurlClient flurlClient = new FlurlClient("https://api.example.com/");
flurlClient.WithHeader("Authorization", "Bearer YourAccessTokenHere");

Imports Flurl
Imports Flurl.Http

' Configure a FlurlClient instance with base URL and headers
Private flurlClient As New FlurlClient("https://api.example.com/")
flurlClient.WithHeader("Authorization", "Bearer YourAccessTokenHere")

var response = await "http://localhost:5013/users".GetAsync();
Console.WriteLine(response.ToString());

if (response.ResponseMessage.IsSuccessStatusCode)
{
    var result = await response.ResponseMessage.Content.ReadAsStringAsync();
    Console.WriteLine(result);
}
else
{
    Console.WriteLine($"Error: {response.StatusCode}");
}

var response = await "http://localhost:5013/users".GetAsync();
Console.WriteLine(response.ToString());

if (response.ResponseMessage.IsSuccessStatusCode)
{
    var result = await response.ResponseMessage.Content.ReadAsStringAsync();
    Console.WriteLine(result);
}
else
{
    Console.WriteLine($"Error: {response.StatusCode}");
}

Dim response = await "http://localhost:5013/users".GetAsync()
Console.WriteLine(response.ToString())

If response.ResponseMessage.IsSuccessStatusCode Then
	Dim result = Await response.ResponseMessage.Content.ReadAsStringAsync()
	Console.WriteLine(result)
Else
	Console.WriteLine($"Error: {response.StatusCode}")
End If

// Handling JSON response
var responseObject = await "https://api.example.com/resource"
    .WithClient(flurlClient)
    .GetJsonAsync<ResponseType>();
// Assuming ResponseType is a class representing the expected JSON structure
Console.WriteLine($"Response: {responseObject.Property}");

// Handling JSON response
var responseObject = await "https://api.example.com/resource"
    .WithClient(flurlClient)
    .GetJsonAsync<ResponseType>();
// Assuming ResponseType is a class representing the expected JSON structure
Console.WriteLine($"Response: {responseObject.Property}");

IRON VB CONVERTER ERROR developers@ironsoftware.com

What is IronPDF?

A feature-rich .NET library named IronPDF is available in C# programs to create, read, and modify PDF documents. With the help of this tool, developers can quickly generate print-ready, high-quality PDFs from HTML, CSS, and JavaScript content. Some essential capabilities include the capacity to watermark, make headers and footers, split and combine PDFs, and convert HTML to PDF. IronPDF supports the .NET Framework and .NET Core, making it useful for various applications.

Because PDFs are simple to integrate and have a wealth of detailed documentation, developers may easily employ them in their applications. IronPDF ensures that the generated PDFs closely resemble the source HTML content by efficiently handling complicated layouts and styling.

IronPDF makes it super simple to convert webpages, URLs, and HTML into high-quality PDFs that look exactly like the original content. It’s perfect for creating PDFs of online reports, invoices, and more. If you’ve been looking for a way to turn HTML to PDF, IronPDF has you covered!

using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();

        // 1. Convert HTML String to PDF
        var htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>";
        var pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent);
        pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf");

        // 2. Convert HTML File to PDF
        var htmlFilePath = "path_to_your_html_file.html"; // Specify the path to your HTML file
        var pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath);
        pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf");

        // 3. Convert URL to PDF
        var url = "http://ironpdf.com"; // Specify the URL
        var pdfFromUrl = renderer.RenderUrlAsPdf(url);
        pdfFromUrl.SaveAs("URLToPDF.pdf");
    }
}

using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();

        // 1. Convert HTML String to PDF
        var htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>";
        var pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent);
        pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf");

        // 2. Convert HTML File to PDF
        var htmlFilePath = "path_to_your_html_file.html"; // Specify the path to your HTML file
        var pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath);
        pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf");

        // 3. Convert URL to PDF
        var url = "http://ironpdf.com"; // Specify the URL
        var pdfFromUrl = renderer.RenderUrlAsPdf(url);
        pdfFromUrl.SaveAs("URLToPDF.pdf");
    }
}

Imports IronPdf

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		Dim renderer = New ChromePdfRenderer()

		' 1. Convert HTML String to PDF
		Dim htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>"
		Dim pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent)
		pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf")

		' 2. Convert HTML File to PDF
		Dim htmlFilePath = "path_to_your_html_file.html" ' Specify the path to your HTML file
		Dim pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath)
		pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf")

		' 3. Convert URL to PDF
		Dim url = "http://ironpdf.com" ' Specify the URL
		Dim pdfFromUrl = renderer.RenderUrlAsPdf(url)
		pdfFromUrl.SaveAs("URLToPDF.pdf")
	End Sub
End Class

IronPDF 的特點

從HTML生成PDF

Convert JavaScript, HTML, and CSS to PDF. It supports media queries and responsive design, two contemporary web standards. It is useful for dynamically decorating PDF reports, invoices, and documents with HTML and CSS.

PDF編輯功能

Text, photos, and other content can be added to preexisting PDFs. Text and pictures can be removed from PDF files. Numerous PDFs can be combined into one file. PDF files can be divided into multiple separate papers. Watermarks, annotations, headers, and footers can be included.

PDF轉換功能

Convert several file kinds, including Word, Excel, and picture files, to PDF format. PDF to image conversion (PNG, JPEG, etc.).

性能和可靠性

High performance and dependability are desired design qualities in industrial settings as they can manage extensive document collections effectively.

首先，確保你的項目安裝了 IronPDF 庫。

To gain the tools you need to work with PDFs in .NET projects, install the IronPDF package.

Install-Package IronPdf

Fetch Data Using Flurl to generate a PDF

To make HTTP queries and get data from your API, use Flurl's fluent API. This is an instance of retrieving JSON data:

using Flurl;
using Flurl.Http;
using IronPdf;
using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        try
        {
            var response = await "http://localhost:5013/users/1".GetJsonAsync<User>();
            var id = response?.Id;
            var name = response?.Name;
            Console.WriteLine($"Data fetched successfully: {name}");

            // Generate PDF using IronPDF
            var renderer = new ChromePdfRenderer();
            string htmlTemplate = $@"
                <html>
                <body>
                    <h1>{id}</h1>
                    <p>{name}</p>
                </body>
                </html>";

            // Generate PDF document from HTML template
            var pdfDocument = renderer.RenderHtmlAsPdf(htmlTemplate);

            // Save or stream the PDF document
            pdfDocument.SaveAs(@"document.pdf");
            Console.WriteLine("PDF document generated successfully.");
        }
        catch (FlurlHttpException ex)
        {
            Console.WriteLine($"HTTP Error: {ex.Message}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error: {ex.Message}");
        }
    }
}

// Example model class for JSON deserialization
public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
}

using Flurl;
using Flurl.Http;
using IronPdf;
using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        try
        {
            var response = await "http://localhost:5013/users/1".GetJsonAsync<User>();
            var id = response?.Id;
            var name = response?.Name;
            Console.WriteLine($"Data fetched successfully: {name}");

            // Generate PDF using IronPDF
            var renderer = new ChromePdfRenderer();
            string htmlTemplate = $@"
                <html>
                <body>
                    <h1>{id}</h1>
                    <p>{name}</p>
                </body>
                </html>";

            // Generate PDF document from HTML template
            var pdfDocument = renderer.RenderHtmlAsPdf(htmlTemplate);

            // Save or stream the PDF document
            pdfDocument.SaveAs(@"document.pdf");
            Console.WriteLine("PDF document generated successfully.");
        }
        catch (FlurlHttpException ex)
        {
            Console.WriteLine($"HTTP Error: {ex.Message}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error: {ex.Message}");
        }
    }
}

// Example model class for JSON deserialization
public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
}

Imports Flurl
Imports Flurl.Http
Imports IronPdf
Imports System
Imports System.Threading.Tasks

Friend Class Program
	Shared Async Function Main(ByVal args() As String) As Task
		Try
			Dim response = await "http://localhost:5013/users/1".GetJsonAsync(Of User)()
			Dim id = response?.Id
			Dim name = response?.Name
			Console.WriteLine($"Data fetched successfully: {name}")

			' Generate PDF using IronPDF
			Dim renderer = New ChromePdfRenderer()
			Dim htmlTemplate As String = $"
                <html>
                <body>
                    <h1>{id}</h1>
                    <p>{name}</p>
                </body>
                </html>"

			' Generate PDF document from HTML template
			Dim pdfDocument = renderer.RenderHtmlAsPdf(htmlTemplate)

			' Save or stream the PDF document
			pdfDocument.SaveAs("document.pdf")
			Console.WriteLine("PDF document generated successfully.")
		Catch ex As FlurlHttpException
			Console.WriteLine($"HTTP Error: {ex.Message}")
		Catch ex As Exception
			Console.WriteLine($"Error: {ex.Message}")
		End Try
	End Function
End Class

' Example model class for JSON deserialization
Public Class User
	Public Property Id() As Integer
	Public Property Name() As String
End Class

In this example, Flurl's .GetJsonAsync() function is used to send a GET request and fetch JSON data. Replace User with your model class, which represents the API response structure, and "URL" with your actual API endpoint. An HTML template (htmlTemplate) can be rendered into a PDF document using IronPDF's ChromePdfRenderer class. Here, the title and body data retrieved from the API are used to dynamically construct the HTML template. The created PDF document (pdfDocument) is saved to the specified location ("document.pdf") on the file system. Modify the path as needed.

Provide robust error handling for problems like network faults (FlurlHttpException) or general exceptions (Exception) during data fetching or PDF production. You can change the page size, margins, headers, footers, and other PDF settings using IronPDF. For more advanced customization possibilities, see IronPDF's manner manual. When sending HTTP queries to APIs, ensure sensitive data and access tokens are handled securely. Use the proper authentication methods that your API requires.