GraphQL C#（开发人员如何使用）

using HotChocolate.Types;
public class QueryType : ObjectType
{
    protected override void Configure(IObjectTypeDescriptor descriptor)
    {
        descriptor.Field("hello world")
            .Type<StringType>()
            .Resolve(context => "Hello, GraphQL!");
    }
}

Imports HotChocolate.Types
Public Class QueryType
	Inherits ObjectType

	Protected Overrides Sub Configure(ByVal descriptor As IObjectTypeDescriptor)
		descriptor.Field("hello world").Type(Of StringType)().Resolve(Function(context) "Hello, GraphQL!")
	End Sub
End Class

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddGraphQLServer()
            .AddQueryType<QueryType>();
    }
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        app.UseRouting();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapGraphQL();
        });
    }
}

Imports Microsoft.AspNetCore.Builder
Imports Microsoft.AspNetCore.Hosting
Imports Microsoft.Extensions.DependencyInjection
Public Class Startup
	Public Sub ConfigureServices(ByVal services As IServiceCollection)
		services.AddGraphQLServer().AddQueryType(Of QueryType)()
	End Sub
	Public Sub Configure(ByVal app As IApplicationBuilder, ByVal env As IWebHostEnvironment)
		app.UseRouting()
		app.UseEndpoints(Sub(endpoints)
			endpoints.MapGraphQL()
		End Sub)
	End Sub
End Class

using GraphQL.Client;
using GraphQL.Client.Http;
using System;
using System.Threading.Tasks;
// query class
public class query
{
    public static async Task Main()
    {
        using var graphQLClient = new GraphQLHttpClient(new GraphQLHttpClientOptions
        {
            EndPoint = new Uri("http://localhost:5000/graphql")
        });
        var schema = new GraphQLRequest
        {
            Query = @"
                {
                    hello world
                }"
        };
        var response = await graphQLClient.SendQueryAsync<dynamic>(shema);
        Console.WriteLine(response.Data.hello);
    }
}

'INSTANT VB NOTE: 'Option Strict Off' is used here since dynamic typing is used:
Option Strict Off

Imports GraphQL.Client
Imports GraphQL.Client.Http
Imports System
Imports System.Threading.Tasks
' query class
Public Class query
	Public Shared Async Function Main() As Task
		Dim graphQLClient = New GraphQLHttpClient(New GraphQLHttpClientOptions With {.EndPoint = New Uri("http://localhost:5000/graphql")})
		Dim schema = New GraphQLRequest With {.Query = "
                {
                    hello world
                }"}
'INSTANT VB NOTE: In the following line, Instant VB substituted 'Object' for 'dynamic' - this will work in VB with Option Strict Off:
		Dim response = Await graphQLClient.SendQueryAsync(Of Object)(shema)
		Console.WriteLine(response.Data.hello)
	End Function
End Class

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");
    }
}

Imports IronPdf

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		Dim renderer = New ChromePdfRenderer()

		' 1. Convert HTML String to PDF
		Dim htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>"
		Dim pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent)
		pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf")

		' 2. Convert HTML File to PDF
		Dim htmlFilePath = "path_to_your_html_file.html" ' Specify the path to your HTML file
		Dim pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath)
		pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf")

		' 3. Convert URL to PDF
		Dim url = "http://ironpdf.com" ' Specify the URL
		Dim pdfFromUrl = renderer.RenderUrlAsPdf(url)
		pdfFromUrl.SaveAs("URLToPDF.pdf")
	End Sub
End Class

using IronPdf;
using GraphQL.Client;
using GraphQL.Client.Http;
using System.Threading.Tasks;
using System;
public class PdfGenerator
{
    public async Task GeneratePdfAsync()
    {
        var graphQLClient = new GraphQLHttpClient(new GraphQLHttpClientOptions
        {
            EndPoint = new Uri("http://localhost:5000/graphql")
        });
        // graphql queries & graphql requests
        var query = new GraphQLRequest 
        {
            Query = @"
                {
                    hello world
                }"
        };
        var response = await graphQLClient.SendQueryAsync<dynamic>(query);
        var helloMessage = response.Data.hello.ToString();
        var htmlContent = $@"
            <html>
            <head><title>GraphQL Report</title></head>
            <body>
                <h1>GraphQL Report</h1>
                <p>{helloMessage}</p>
            </body>
            </html>";
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf(htmlContent);
        pdf.SaveAs("GraphQLReport.pdf");
    }
}

'INSTANT VB NOTE: 'Option Strict Off' is used here since dynamic typing is used:
Option Strict Off

Imports IronPdf
Imports GraphQL.Client
Imports GraphQL.Client.Http
Imports System.Threading.Tasks
Imports System
Public Class PdfGenerator
	Public Async Function GeneratePdfAsync() As Task
		Dim graphQLClient = New GraphQLHttpClient(New GraphQLHttpClientOptions With {.EndPoint = New Uri("http://localhost:5000/graphql")})
		' graphql queries & graphql requests
		Dim query As New GraphQLRequest With {.Query = "
                {
                    hello world
                }"}
'INSTANT VB NOTE: In the following line, Instant VB substituted 'Object' for 'dynamic' - this will work in VB with Option Strict Off:
		Dim response = Await graphQLClient.SendQueryAsync(Of Object)(query)
		Dim helloMessage = response.Data.hello.ToString()
		Dim htmlContent = $"
            <html>
            <head><title>GraphQL Report</title></head>
            <body>
                <h1>GraphQL Report</h1>
                <p>{helloMessage}</p>
            </body>
            </html>"
		Dim renderer = New ChromePdfRenderer()
		Dim pdf = renderer.RenderHtmlAsPdf(htmlContent)
		pdf.SaveAs("GraphQLReport.pdf")
	End Function
End Class