C# Record (Funktionsweise für Entwickler)

Record Declaration

Declaring a record is straightforward. You can define a record using the record keyword followed by the type (class or struct) and the name of the record. For example, a simple person record can be declared as:

public record class Person(string FirstName, string LastName);

public record class Person(string FirstName, string LastName);

'INSTANT VB TODO TASK: C# 'records' are not converted by Instant VB:
'public record class Person(string FirstName, string LastName)

This declaration includes positional parameters for FirstName and LastName, which under the hood, generate public properties and a primary constructor for these properties.

Immutable Record Struct

An immutable record struct is declared similarly to a record class but using the record struct syntax. It combines the immutability and value-based comparison of records with the performance benefits of a value type:

public readonly record struct ImmutablePerson(string FirstName, string LastName);

public readonly record struct ImmutablePerson(string FirstName, string LastName);

'INSTANT VB TODO TASK: C# 'records' are not converted by Instant VB:
'public readonly record struct ImmutablePerson(string FirstName, string LastName)

Creating and Comparing Records

Consider the following example where we create two instances of a person record:

var person1 = new Person("Iron", "Software");
var person2 = new Person("Iron", "Software");
Console.WriteLine(person1 == person2); // Output: True

var person1 = new Person("Iron", "Software");
var person2 = new Person("Iron", "Software");
Console.WriteLine(person1 == person2); // Output: True

Dim person1 = New Person("Iron", "Software")
Dim person2 = New Person("Iron", "Software")
Console.WriteLine(person1 = person2) ' Output: True

Despite person1 and person2 being two distinct instances, they are considered equal based on their property values, showcasing value-based equality. This is a significant departure from the reference types' default behavior, which focuses on reference equality.

Immutable Properties

By design, record properties are immutable. This means you cannot change the property values of a record instance after it has been created.

// This will result in a compilation error
// person1.FirstName = "Jane";

// This will result in a compilation error
// person1.FirstName = "Jane";

' This will result in a compilation error
' person1.FirstName = "Jane";

Inheritance with Records

Records support inheritance, allowing you to create a hierarchy of data models. Here's how you can extend a base record:

public record Employee(string FirstName, string LastName, string Department) : Person(FirstName, LastName);

public record Employee(string FirstName, string LastName, string Department) : Person(FirstName, LastName);

'INSTANT VB TODO TASK: C# 'records' are not converted by Instant VB:
'public record Employee(string FirstName, string LastName, string Department) : Person(FirstName, LastName)

This Employee record extends Person, adding the additional Department property.

Non-Destructive Mutation

Records provide a built-in method for creating a new record instance from an existing one with some properties modified, known as non-destructive mutation.

var updatedPerson = person1 with { FirstName = "Jane" };

var updatedPerson = person1 with { FirstName = "Jane" };

'INSTANT VB TODO TASK: C# 'with expressions' are not converted by Instant VB:
'var updatedPerson = person1 with { FirstName = "Jane" }

Built-in Formatting

Records come with built-in formatting for easier debugging and logging, automatically providing a string representation of their properties.

Console.WriteLine(person1);

Console.WriteLine(person1);

Console.WriteLine(person1)

How to Install the IronPDF Library

Installing IronPDF is straightforward and can be accomplished via the NuGet Package Manager in Visual Studio. Follow these steps:

1. In Visual Studio, navigate to Solution Explorer, right-click on References, and select Manage NuGet Packages.
2. In the NuGet Package Manager, select Browse and search for "IronPdf".
3. Find the IronPDF package and click Install.

Alternatively, you can install it using the Package Manager Console with the command:

Install-Package IronPdf

Example: Using C# Record with IronPDF

Let's consider a practical example where we use a C# record to hold data that we then use to generate a PDF document with IronPDF:

public record Person(string FirstName, string LastName);

class Program
{
    static void Main(string[] args)
    {
        // Create an instance of the Person record.
        var person = new Person("Iron", "Developer");

        // Initialize a new renderer object for generating PDF files using Chrome's rendering engine.
        var renderer = new IronPdf.Rendering.ChromePdfRenderer();

        // Render an HTML string as a PDF document.
        var pdf = renderer.RenderHtmlAsPdf($"<h1>Person Record</h1><p>Name: {person.FirstName} {person.LastName}</p>");

        // Save the PDF to the specified location.
        pdf.SaveAs("PersonRecord.pdf");
    }
}

public record Person(string FirstName, string LastName);

class Program
{
    static void Main(string[] args)
    {
        // Create an instance of the Person record.
        var person = new Person("Iron", "Developer");

        // Initialize a new renderer object for generating PDF files using Chrome's rendering engine.
        var renderer = new IronPdf.Rendering.ChromePdfRenderer();

        // Render an HTML string as a PDF document.
        var pdf = renderer.RenderHtmlAsPdf($"<h1>Person Record</h1><p>Name: {person.FirstName} {person.LastName}</p>");

        // Save the PDF to the specified location.
        pdf.SaveAs("PersonRecord.pdf");
    }
}

'INSTANT VB TODO TASK: C# 'records' are not converted by Instant VB:
'public record Person(string FirstName, string LastName)

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Create an instance of the Person record.
		Dim person As New Person("Iron", "Developer")

		' Initialize a new renderer object for generating PDF files using Chrome's rendering engine.
		Dim renderer = New IronPdf.Rendering.ChromePdfRenderer()

		' Render an HTML string as a PDF document.
		Dim pdf = renderer.RenderHtmlAsPdf($"<h1>Person Record</h1><p>Name: {person.FirstName} {person.LastName}</p>")

		' Save the PDF to the specified location.
		pdf.SaveAs("PersonRecord.pdf")
	End Sub
End Class

This example creates a simple Person record and then uses IronPDF to generate a PDF document displaying the person's name. It showcases how seamlessly C# records can integrate with PDF generation in .NET applications.

IronPDF Licensing

IronPDF is a commercial product offering various licenses tailored to different needs, including individual and commercial options. Each purchase comes with a lifetime license and a 30-day money-back guarantee. Explore IronPDF Licensing Options before purchasing the license.