如何在C#中使用Fluent Validation與IronPDF

public abstract class PdfContent
{
    public abstract string RenderHtml();
}

public class InvoiceContent : PdfContent
{
    public string CustomerName { get; set; }
    public string Address { get; set; }
    public List<InvoiceItem> InvoiceItems { get; set; }

    public override string RenderHtml()
    {
        string invoiceItemsHtml = string.Join("", InvoiceItems.Select(item => $"<li>{item.Description}: {item.Price}</li>"));
        return $"<h1>Invoice for {CustomerName}</h1><p>{Address}</p><ul>{invoiceItemsHtml}</ul>";
    }
}

public class InvoiceItem
{
    public string Description { get; set; }
    public decimal Price { get; set; }
}

Public MustInherit Class PdfContent
	Public MustOverride Function RenderHtml() As String
End Class

Public Class InvoiceContent
	Inherits PdfContent

	Public Property CustomerName() As String
	Public Property Address() As String
	Public Property InvoiceItems() As List(Of InvoiceItem)

	Public Overrides Function RenderHtml() As String
		Dim invoiceItemsHtml As String = String.Join("", InvoiceItems.Select(Function(item) $"<li>{item.Description}: {item.Price}</li>"))
		Return $"<h1>Invoice for {CustomerName}</h1><p>{Address}</p><ul>{invoiceItemsHtml}</ul>"
	End Function
End Class

Public Class InvoiceItem
	Public Property Description() As String
	Public Property Price() As Decimal
End Class

using FluentValidation;

public class InvoiceContentValidator : AbstractValidator<InvoiceContent>
{
    public InvoiceContentValidator()
    {
        RuleFor(content => content.CustomerName).NotEmpty().WithMessage("Customer name is required.");
        RuleFor(content => content.Address).NotEmpty().WithMessage("Address is required.");
        RuleFor(content => content.InvoiceItems).NotEmpty().WithMessage("At least one invoice item is required.");
        RuleForEach(content => content.InvoiceItems).SetValidator(new InvoiceItemValidator());
    }
}

public class InvoiceItemValidator : AbstractValidator<InvoiceItem>
{
    public InvoiceItemValidator()
    {
        RuleFor(item => item.Description).NotEmpty().WithMessage("Description is required.");
        RuleFor(item => item.Price).GreaterThanOrEqualTo(0).WithMessage("Price must be greater than or equal to 0.");
    }
}

Imports FluentValidation

Public Class InvoiceContentValidator
	Inherits AbstractValidator(Of InvoiceContent)

	Public Sub New()
		RuleFor(Function(content) content.CustomerName).NotEmpty().WithMessage("Customer name is required.")
		RuleFor(Function(content) content.Address).NotEmpty().WithMessage("Address is required.")
		RuleFor(Function(content) content.InvoiceItems).NotEmpty().WithMessage("At least one invoice item is required.")
		RuleForEach(Function(content) content.InvoiceItems).SetValidator(New InvoiceItemValidator())
	End Sub
End Class

Public Class InvoiceItemValidator
	Inherits AbstractValidator(Of InvoiceItem)

	Public Sub New()
		RuleFor(Function(item) item.Description).NotEmpty().WithMessage("Description is required.")
		RuleFor(Function(item) item.Price).GreaterThanOrEqualTo(0).WithMessage("Price must be greater than or equal to 0.")
	End Sub
End Class

using IronPdf;
using FluentValidation;

public class PdfService
{
    public PdfDocument GeneratePdf<T>(T content) where T : PdfContent
    {
        var validator = GetValidatorForContent(content);
        FluentValidation.Results.ValidationResult validationResult = validator.Validate(content);

        if (!validationResult.IsValid)
        {
            throw new FluentValidation.ValidationException(validationResult.Errors);
        }

        var renderer = new ChromePdfRenderer();
        return renderer.RenderHtmlAsPdf(content.RenderHtml());
    }

    private IValidator<T> GetValidatorForContent<T>(T content) where T : PdfContent
    {
        if (content is InvoiceContent)
        {
            return (IValidator<T>)new InvoiceContentValidator();
        }
        else
        {
            throw new NotSupportedException("Unsupported content type.");
        }
    }
}

Imports IronPdf
Imports FluentValidation

Public Class PdfService
	Public Function GeneratePdf(Of T As PdfContent)(ByVal content As T) As PdfDocument
		Dim validator = GetValidatorForContent(content)
		Dim validationResult As FluentValidation.Results.ValidationResult = validator.Validate(content)

		If Not validationResult.IsValid Then
			Throw New FluentValidation.ValidationException(validationResult.Errors)
		End If

		Dim renderer = New ChromePdfRenderer()
		Return renderer.RenderHtmlAsPdf(content.RenderHtml())
	End Function

	Private Function GetValidatorForContent(Of T As PdfContent)(ByVal content As T) As IValidator(Of T)
		If TypeOf content Is InvoiceContent Then
			Return DirectCast(New InvoiceContentValidator(), IValidator(Of T))
		Else
			Throw New NotSupportedException("Unsupported content type.")
		End If
	End Function
End Class

public class Program
{
    static void Main(string [] args)
    {
        var pdfService = new PdfService();

        // Test 1: Empty Customer Name
        try
        {
            var invoiceContent = new InvoiceContent
            {
                CustomerName = "",
                Address = "123 Main St, Anytown, USA",
                InvoiceItems = new List<InvoiceItem> {
                    new InvoiceItem { Description = "Item 1", Price = 19.99M },
                    new InvoiceItem { Description = "Item 2", Price = 29.99M }
                }
            };

            var pdfDocument = pdfService.GeneratePdf(invoiceContent);
            pdfDocument.SaveAs("C:\\TestInvoice.pdf");
            Console.WriteLine("PDF generated successfully!");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error generating PDF: " + ex.Message);
        }

        // Test 2: Empty InvoiceItems
        try
        {
            var invoiceContent = new InvoiceContent
            {
                CustomerName = "John Doe",
                Address = "123 Main St, Anytown, USA",
                InvoiceItems = new List<InvoiceItem>()  // Empty list
            };

            var pdfDocument = pdfService.GeneratePdf(invoiceContent);
            pdfDocument.SaveAs("C:\\TestInvoice.pdf");
            Console.WriteLine("PDF generated successfully!");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error generating PDF: " + ex.Message);
        }

        //Successful
        try
        {
            var invoiceContent = new InvoiceContent
            {
                CustomerName = "John Doe",
                Address = "123 Main St, Anytown, USA",
                InvoiceItems = new List<InvoiceItem> {
                new InvoiceItem { Description = "Item 1", Price = 19.99M },
                new InvoiceItem { Description = "Item 2", Price = 29.99M }
            }
            };
            var pdfDocument = pdfService.GeneratePdf(invoiceContent);
            pdfDocument.SaveAs("C:\\TestInvoice.pdf");
            Console.WriteLine("PDF generated successfully!");
        }
        catch(Exception ex)
        {
            Console.WriteLine("Error generating PDF: " + ex.Message);
        }
    }
}

Public Class Program
	Shared Sub Main(ByVal args() As String)
		Dim pdfService As New PdfService()

		' Test 1: Empty Customer Name
		Try
			Dim invoiceContent As New InvoiceContent With {
				.CustomerName = "",
				.Address = "123 Main St, Anytown, USA",
				.InvoiceItems = New List(Of InvoiceItem) From {
					New InvoiceItem With {
						.Description = "Item 1",
						.Price = 19.99D
					},
					New InvoiceItem With {
						.Description = "Item 2",
						.Price = 29.99D
					}
				}
			}

			Dim pdfDocument = pdfService.GeneratePdf(invoiceContent)
			pdfDocument.SaveAs("C:\TestInvoice.pdf")
			Console.WriteLine("PDF generated successfully!")
		Catch ex As Exception
			Console.WriteLine("Error generating PDF: " & ex.Message)
		End Try

		' Test 2: Empty InvoiceItems
		Try
			Dim invoiceContent As New InvoiceContent With {
				.CustomerName = "John Doe",
				.Address = "123 Main St, Anytown, USA",
				.InvoiceItems = New List(Of InvoiceItem)()
			}

			Dim pdfDocument = pdfService.GeneratePdf(invoiceContent)
			pdfDocument.SaveAs("C:\TestInvoice.pdf")
			Console.WriteLine("PDF generated successfully!")
		Catch ex As Exception
			Console.WriteLine("Error generating PDF: " & ex.Message)
		End Try

		'Successful
		Try
			Dim invoiceContent As New InvoiceContent With {
				.CustomerName = "John Doe",
				.Address = "123 Main St, Anytown, USA",
				.InvoiceItems = New List(Of InvoiceItem) From {
					New InvoiceItem With {
						.Description = "Item 1",
						.Price = 19.99D
					},
					New InvoiceItem With {
						.Description = "Item 2",
						.Price = 29.99D
					}
				}
			}
			Dim pdfDocument = pdfService.GeneratePdf(invoiceContent)
			pdfDocument.SaveAs("C:\TestInvoice.pdf")
			Console.WriteLine("PDF generated successfully!")
		Catch ex As Exception
			Console.WriteLine("Error generating PDF: " & ex.Message)
		End Try
	End Sub
End Class