C# Catch Multiple Exceptions (How It Works For Developers)

What is Exception Handling?

Exception handling in C# is a method used to handle runtime errors, prevent abrupt termination of a program, and manage unexpected situations when they occur during the execution of a program. The core components of exception handling include the try, catch, and finally blocks.

try
{
    // Code that may throw an exception
}
catch (Exception e)
{
    // Code to handle the exception
}
finally
{
    // Code that executes after try and catch, regardless of an exception
}

try
{
    // Code that may throw an exception
}
catch (Exception e)
{
    // Code to handle the exception
}
finally
{
    // Code that executes after try and catch, regardless of an exception
}

Catching Multiple Exceptions

In real-world applications, a single operation might throw exceptions of various types. To address this, C# allows you to define multiple catch blocks for a single try block. Each catch block can specify a different exception type to handle all the exceptions.

try
{
    // Code that may throw multiple types of exceptions
    int[] numbers = { 1, 2, 3 };
    Console.WriteLine(numbers[5]); // This will throw an IndexOutOfRangeException
}
catch (IndexOutOfRangeException ex)
{
    Console.WriteLine("An index was out of range: " + ex.Message);
}
catch (DivideByZeroException ex)
{
    Console.WriteLine("Can't divide by Zero: " + ex.Message);
}
catch (Exception ex)
{
    Console.WriteLine("Error: " + ex.Message);
}

try
{
    // Code that may throw multiple types of exceptions
    int[] numbers = { 1, 2, 3 };
    Console.WriteLine(numbers[5]); // This will throw an IndexOutOfRangeException
}
catch (IndexOutOfRangeException ex)
{
    Console.WriteLine("An index was out of range: " + ex.Message);
}
catch (DivideByZeroException ex)
{
    Console.WriteLine("Can't divide by Zero: " + ex.Message);
}
catch (Exception ex)
{
    Console.WriteLine("Error: " + ex.Message);
}

Using Exception Filters with the When Keyword

C# also supports exception filters that allow you to specify a condition within the catch block. This feature uses the when keyword to provide more control over which exceptions to catch based on the condition evaluated at runtime.

Here is how you can use the when keyword to add exception filters:

try
{
    // Code that may throw an exception
    throw new InvalidOperationException("Invalid operation occurred", new Exception("Inner exception"));
}
catch (Exception ex) when (ex.InnerException != null)
{
    Console.WriteLine("Exception with inner exception caught: " + ex.Message);
}
catch (Exception ex)
{
    Console.WriteLine("Exception caught: " + ex.Message);
}

try
{
    // Code that may throw an exception
    throw new InvalidOperationException("Invalid operation occurred", new Exception("Inner exception"));
}
catch (Exception ex) when (ex.InnerException != null)
{
    Console.WriteLine("Exception with inner exception caught: " + ex.Message);
}
catch (Exception ex)
{
    Console.WriteLine("Exception caught: " + ex.Message);
}

The Role of the Finally Block

The finally block is used to execute code after the try and any catch blocks are complete. It is useful for cleaning up resources, like closing file streams or database connections, regardless of whether an exception occurred.

try
{
    // Code that might throw an exception
}
catch (Exception e)
{
    // Handle the exception
}
finally
{
    // Cleanup code, executed after try/catch
    Console.WriteLine("Cleanup code runs here.");
}

try
{
    // Code that might throw an exception
}
catch (Exception e)
{
    // Handle the exception
}
finally
{
    // Cleanup code, executed after try/catch
    Console.WriteLine("Cleanup code runs here.");
}

Introduction of IronPDF

IronPDF is a comprehensive library designed for C# developers working within the .NET applications. It helps developers to manipulate, manage, and create PDF files directly from HTML. It does not require the external dependency to work.

You can do any PDF operation without using and installing Adobe Acrobat. IronPDF supports various PDF functionalities such as editing, merging, splitting, and securing PDF documents with encryption and digital signatures. Developers can utilize IronPDF in multiple application types, including web applications, desktop applications, and services.

Interlink:

The key feature of IronPDF is converting HTML to PDF, which retains both layout and style. It’s perfect for producing PDFs from web content, whether it’s for reports, invoices, or documentation. HTML files, URLs, and HTML strings can all be converted to PDF files.

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");
    }
}

Install-Package IronPdf

using IronPdf;
using System;

class Program
{
    static void Main(string[] args)
    {
        // Set your IronPDF license key, if applicable.
        License.LicenseKey = "License-Key";
        var renderer = new ChromePdfRenderer();

        try
        {
            // Convert HTML to PDF
            var pdf = renderer.RenderHtmlAsPdf("<h1>Hello, World!</h1>");
            pdf.SaveAs("Exceptions.pdf");
            Console.WriteLine("PDF successfully created.");
        }
        catch (IronPdf.Exceptions.IronPdfProductException ex)
        {
            // Handle PDF generation errors
            Console.WriteLine("Failed to generate PDF: " + ex.Message);
        }
        catch (System.IO.IOException ex)
        {
            // Handle IO errors (e.g., disk I/O errors)
            Console.WriteLine("IO Exception: " + ex.Message);
        }
        catch (Exception ex)
        {
            // Handle other errors
            Console.WriteLine("Error: " + ex.Message);
        }
    }
}

using IronPdf;
using System;

class Program
{
    static void Main(string[] args)
    {
        // Set your IronPDF license key, if applicable.
        License.LicenseKey = "License-Key";
        var renderer = new ChromePdfRenderer();

        try
        {
            // Convert HTML to PDF
            var pdf = renderer.RenderHtmlAsPdf("<h1>Hello, World!</h1>");
            pdf.SaveAs("Exceptions.pdf");
            Console.WriteLine("PDF successfully created.");
        }
        catch (IronPdf.Exceptions.IronPdfProductException ex)
        {
            // Handle PDF generation errors
            Console.WriteLine("Failed to generate PDF: " + ex.Message);
        }
        catch (System.IO.IOException ex)
        {
            // Handle IO errors (e.g., disk I/O errors)
            Console.WriteLine("IO Exception: " + ex.Message);
        }
        catch (Exception ex)
        {
            // Handle other errors
            Console.WriteLine("Error: " + ex.Message);
        }
    }
}

Conclusion

Handling multiple exceptions in C# is a powerful feature that provides robust error-handling capabilities in your applications. By using multiple catch blocks, exception filters, and the finally block, you can create a resilient and stable application that handles different errors gracefully and maintains its integrity under various error conditions.

This comprehensive understanding and implementation of multiple exception handling ensure that your applications are well-prepared to deal with unexpected situations effectively. IronPDF offers a free trial starts from $799.