小编Ani*_*wat的帖子

我是 GraphQL 新手。每当我运行我的项目时它都会显示

服务器无法访问

我交叉检查了项目文件，我猜问题出在该Startup.cs文件上。我尝试app.UseGraphQL在配置函数中使用，但 IDE 无法建议我使用正确的库。

这是我的代码：

using GraphQLMutationBasicCRUD.IService;
using GraphQLMutationBasicCRUD.Service;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using HotChocolate;
using GraphQLMutationBasicCRUD.GraphQL;
using HotChocolate.AspNetCore;
using HotChocolate.AspNetCore.Playground;
using Microsoft.AspNetCore.Http;
namespace GraphQLMutationBasicCRUD
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton<IGroupService, …

我正在尝试实现Microsoft 的官方文档。当我尝试将号码输入拨号页面时，它会抛出异常，FeatureNotSupportedException 该异常按照文档说明

当尝试在不支持该功能的平台上使用该功能时发生的异常。

我使用的是 OnePlus AC2001 Android11.0 - API-30，我相信所有手机都必须包含拨号的基本功能PhoneDialer.Open(translatedNumber)

  async void OnCall(object sender, System.EventArgs e)
        {
            if (await this.DisplayAlert(
        "Dial a Number",
        "Would you like to call " + translatedNumber + "?",
        "Yes",
        "No"))
            {
                try
                {
                    PhoneDialer.Open(translatedNumber);
                }
                catch (ArgumentNullException)
                {
                    await DisplayAlert("Unable to dial", "Phone number was not valid.", "OK");
                }
                catch (FeatureNotSupportedException)
                {
                    await DisplayAlert("Unable to dial", "Phone dialing not supported.", "OK");
                }
                catch (Exception)
                {
                    // Other error has occurred.
                    await …