在 C# 中，透過登入驗證將 HTML 轉換為 PDF

// Download HTML content from a URL
string html;
using (WebClient client = new WebClient()) 
{
    html = client.DownloadString("http://www.google.com");
}

// Load the HTML into an HtmlDocument
HtmlDocument doc = new HtmlDocument();        
doc.LoadHtml(html);

// Iterate through all image nodes and print their src attributes
foreach(HtmlNode img in doc.DocumentNode.SelectNodes("//img")) 
{
    Console.WriteLine(img.GetAttributeValue("src", null));
}

' Download HTML content from a URL
Dim html As String
Using client As New WebClient()
	html = client.DownloadString("http://www.google.com")
End Using

' Load the HTML into an HtmlDocument
Dim doc As New HtmlDocument()
doc.LoadHtml(html)

' Iterate through all image nodes and print their src attributes
For Each img As HtmlNode In doc.DocumentNode.SelectNodes("//img")
	Console.WriteLine(img.GetAttributeValue("src", Nothing))
Next img

using IronPdf;
using System;

ChromePdfRenderer renderer = new ChromePdfRenderer
{
    // setting login credentials to bypass basic authentication
    LoginCredentials = new ChromeHttpLoginCredentials()
    {
        NetworkUsername = "testUser",
        NetworkPassword = "testPassword"
    }
};

var uri = new Uri("http://localhost:51169/Invoice");

// Render web URL to PDF
PdfDocument pdf = renderer.RenderUrlAsPdf(uri);

// Export PDF
pdf.SaveAs("UrlToPdfExample.Pdf");

Imports IronPdf
Imports System

Private renderer As New ChromePdfRenderer With {
	.LoginCredentials = New ChromeHttpLoginCredentials() With {
		.NetworkUsername = "testUser",
		.NetworkPassword = "testPassword"
	}
}

Private uri = New Uri("http://localhost:51169/Invoice")

' Render web URL to PDF
Private pdf As PdfDocument = renderer.RenderUrlAsPdf(uri)

' Export PDF
pdf.SaveAs("UrlToPdfExample.Pdf")

// Converts an MVC partial view to a string
public static string RenderPartialViewToString(this Controller controller, string viewPath, object model = null)
{
    try
    {
        // Set the model
        var context = controller.ControllerContext;
        controller.ViewData.Model = model;

        using (var sw = new StringWriter())
        {
            // Find the partial view
            var viewResult = ViewEngines.Engines.FindPartialView(context, viewPath);

            if (viewResult.View == null)
            {
                throw new Exception($"Partial view {viewPath} could not be found.");
            }

            // Create a view context
            var viewContext = new ViewContext(context, viewResult.View, context.Controller.ViewData, context.Controller.TempData, sw);

            // Render the view
            viewResult.View.Render(viewContext, sw);
            viewResult.ViewEngine.ReleaseView(context, viewResult.View);

            return sw.GetStringBuilder().ToString();
        }
    }
    catch (Exception ex)
    {
        // Return error message if there is an exception
        return ex.Message;
    }
}

' Converts an MVC partial view to a string
<System.Runtime.CompilerServices.Extension> _
Public Function RenderPartialViewToString(ByVal controller As Controller, ByVal viewPath As String, Optional ByVal model As Object = Nothing) As String
	Try
		' Set the model
		Dim context = controller.ControllerContext
		controller.ViewData.Model = model

		Using sw = New StringWriter()
			' Find the partial view
			Dim viewResult = ViewEngines.Engines.FindPartialView(context, viewPath)

			If viewResult.View Is Nothing Then
				Throw New Exception($"Partial view {viewPath} could not be found.")
			End If

			' Create a view context
			Dim viewContext As New ViewContext(context, viewResult.View, context.Controller.ViewData, context.Controller.TempData, sw)

			' Render the view
			viewResult.View.Render(viewContext, sw)
			viewResult.ViewEngine.ReleaseView(context, viewResult.View)

			Return sw.GetStringBuilder().ToString()
		End Using
	Catch ex As Exception
		' Return error message if there is an exception
		Return ex.Message
	End Try
End Function