C# Logging（對於開發者的運行原理）

using Microsoft.Extensions.Logging;

public class Program
{
    static void Main(string[] args)
    {
        // Create a logger instance with console output
        ILogger logger = LoggerFactory.Create(builder => 
        {
            builder.AddConsole(); // Add console as a logging target
        }).CreateLogger<Program>();

        // Log messages with different levels of severity
        logger.LogInformation("This is an information log message");
        logger.LogError("This is an error log message");
    }
}

Imports Microsoft.Extensions.Logging

Public Class Program
	Shared Sub Main(ByVal args() As String)
		' Create a logger instance with console output
		Dim logger As ILogger = LoggerFactory.Create(Sub(builder)
			builder.AddConsole() ' Add console as a logging target
		End Sub).CreateLogger<Program>()

		' Log messages with different levels of severity
		logger.LogInformation("This is an information log message")
		logger.LogError("This is an error log message")
	End Sub
End Class

// Log message with structured data
logger.LogDebug("Processing order {OrderId} at {Timestamp}", orderId, DateTime.UtcNow);

' Log message with structured data
logger.LogDebug("Processing order {OrderId} at {Timestamp}", orderId, DateTime.UtcNow)

// Direct log output to the Windows Event Log under a specific source name
builder.AddEventLog(new EventLogSettings
{
    SourceName = "MyApplication"
});

' Direct log output to the Windows Event Log under a specific source name
builder.AddEventLog(New EventLogSettings With {.SourceName = "MyApplication"})

using IronPdf;
using Microsoft.Extensions.Logging;
using System;

public class PdfGenerator
{
    private readonly ILogger _logger;

    public PdfGenerator(ILogger<PdfGenerator> logger)
    {
        _logger = logger;
    }

    public void CreatePdfFromHtml(string htmlContent, string outputPath)
    {
        try
        {
            // Initialize PDF renderer
            var renderer = new ChromePdfRenderer();

            // Convert HTML content to PDF
            var pdf = renderer.RenderHtmlAsPdf(htmlContent);

            // Save the generated PDF to a file
            pdf.SaveAs(outputPath);

            // Log the success of PDF creation
            _logger.LogInformation("PDF created successfully at {OutputPath}", outputPath);
        }
        catch (Exception ex)
        {
            // Log any errors encountered during PDF creation
            _logger.LogError(ex, "Error creating PDF from HTML");
        }
    }
}

// Usage example
public class Program
{
    static void Main(string[] args)
    {
        // Set the license key for IronPDF, if applicable
        License.LicenseKey = "License-Key";

        // Create a logger factory to manage logging configurations
        ILoggerFactory loggerFactory = LoggerFactory.Create(builder =>
        {
            builder.AddConsole(); // Enable logging to the console
        });

        // Create a logger for the PdfGenerator class
        ILogger<PdfGenerator> logger = loggerFactory.CreateLogger<PdfGenerator>();

        // Instantiate the PDF generator
        PdfGenerator pdfGenerator = new PdfGenerator(logger);

        // Example HTML content and output path
        string htmlContent = "<h1>Hello, PDF!</h1><p>This is a simple PDF generated from HTML.</p>";
        string outputPath = "output.pdf";

        // Create a PDF from the provided HTML content
        pdfGenerator.CreatePdfFromHtml(htmlContent, outputPath);
    }
}

Imports IronPdf
Imports Microsoft.Extensions.Logging
Imports System

Public Class PdfGenerator
	Private ReadOnly _logger As ILogger

	Public Sub New(ByVal logger As ILogger(Of PdfGenerator))
		_logger = logger
	End Sub

	Public Sub CreatePdfFromHtml(ByVal htmlContent As String, ByVal outputPath As String)
		Try
			' Initialize PDF renderer
			Dim renderer = New ChromePdfRenderer()

			' Convert HTML content to PDF
			Dim pdf = renderer.RenderHtmlAsPdf(htmlContent)

			' Save the generated PDF to a file
			pdf.SaveAs(outputPath)

			' Log the success of PDF creation
			_logger.LogInformation("PDF created successfully at {OutputPath}", outputPath)
		Catch ex As Exception
			' Log any errors encountered during PDF creation
			_logger.LogError(ex, "Error creating PDF from HTML")
		End Try
	End Sub
End Class

' Usage example
Public Class Program
	Shared Sub Main(ByVal args() As String)
		' Set the license key for IronPDF, if applicable
		License.LicenseKey = "License-Key"

		' Create a logger factory to manage logging configurations
		Dim loggerFactory As ILoggerFactory = LoggerFactory.Create(Sub(builder)
			builder.AddConsole() ' Enable logging to the console
		End Sub)

		' Create a logger for the PdfGenerator class
		Dim logger As ILogger(Of PdfGenerator) = loggerFactory.CreateLogger(Of PdfGenerator)()

		' Instantiate the PDF generator
		Dim pdfGenerator As New PdfGenerator(logger)

		' Example HTML content and output path
		Dim htmlContent As String = "<h1>Hello, PDF!</h1><p>This is a simple PDF generated from HTML.</p>"
		Dim outputPath As String = "output.pdf"

		' Create a PDF from the provided HTML content
		pdfGenerator.CreatePdfFromHtml(htmlContent, outputPath)
	End Sub
End Class