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    public class ResilientTransaction
    {
        private DbContext _context;
        private ResilientTransaction(DbContext context) =>
            _context = context ?? throw new ArgumentNullException(nameof(context));

        public static ResilientTransaction New (DbContext context) =>
            new ResilientTransaction(context);        

        public async Task ExecuteAsync(Func<Task> action)

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services.AddHttpClient<ExampleService>();

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services.AddHttpClient("example", c =>
{
    c.BaseAddress = new Uri("https://api.example.com/");
    c.DefaultRequestHeaders.Add("Accept", "application/json");
    c.DefaultRequestHeaders.Add("User-Agent", "HttpClientFactory-Sample");
});

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public class TypedClientModel : PageModel
{
    private readonly ExampleService _exampleService;

    public IEnumerable<User> Users { get; private set; }

    public bool HasUser => Users.Any();

    public bool GetUsersError { get; private set; }

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public class ExampleService
{
    public HttpClient Client { get; }

    public ExampleService(HttpClient client)
    {
        client.BaseAddress = new Uri("https://api.example.com/");
        client.DefaultRequestHeaders.Add("Accept","application/json");
        client.DefaultRequestHeaders.Add("User-Agent","HttpClientFactory-Sample");
        Client = client;

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public class NamedClientModel : PageModel
{
    private readonly IHttpClientFactory _clientFactory;

    public IEnumerable<Employee> Employees { get; private set; }

    public bool GetEmployeesError { get; private set; }

    public bool HasEmployees => Employees.Any();

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public class FirstUsageModel : PageModel
{
    private readonly IHttpClientFactory _clientFactory;

    public IEnumerable<User> Users { get; private set; }

    public bool GetUsersError { get; private set; }

    public BasicUsageModel(IHttpClientFactory clientFactory)
    {

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public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)

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@using CSPExample.Helper
@{
    ViewData["Title"] = "Home Page";
}

<div class="text-center">
    <h1 class="display-4">Welcome</h1>
    <p>Learn about <a href="#" id="click">building Web apps with ASP.NET Core</a>.</p>
</div>

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using Microsoft.AspNetCore.Html;
using Microsoft.AspNetCore.Mvc.Rendering;

namespace CSPExample.Helper
{
    public static class NonceHelper
    {
        public static HtmlString Nonce(this IHtmlHelper helper)
        {
            string nonceValue = helper.ViewContext.HttpContext.Items["ScriptNonce"].ToString();