Category Archives: Net Core

hello-world-startup-multiple-configure-environment


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection

namespace WebApplication1
{
    public class Startup
    {
        public void ConfigureProduction(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are the three default services available at Configure

            app.Run(context =>
            {
                return context.Response.WriteAsync("Hello world Production");
            });
        }

        public void ConfigureDevelopment(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are the three default services available at Configure

            app.Run(context =>
            {
                return context.Response.WriteAsync("Hello world Development");
            });
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

namespace WebApplication1

{

public class Startup

{

public void ConfigureProduction(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

//These are the three default services available at Configure

app.Run(context =>

{

return context.Response.WriteAsync("Hello world Production");

});

}

public void ConfigureDevelopment(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

//These are the three default services available at Configure

app.Run(context =>

{

return context.Response.WriteAsync("Hello world Development");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 : Hello world Development

hello-world-startup-istartupfilter


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection
using System.Threading.Tasks;
using System; //IStartupFilter

namespace WebApplication1
{

    public class GreetingStartupFilter : IStartupFilter
    {
        public Action<IApplicationBuilder> Configure(Action<IApplicationBuilder> next)
        {
            return builder =>
            {
                builder.UseMiddleware<GreetingMiddleware>();
                builder.UseMiddleware<HelloWorldMiddleware>();
                next(builder);
            };
        }
    }

    public class HelloWorldMiddleware
    {
        public HelloWorldMiddleware(RequestDelegate next)
        {

        }

        public async Task Invoke(HttpContext context)
        {
            await context.Response.WriteAsync($"{context.Items["Greetings"]}");
        }
    }

    public class GreetingMiddleware
    {
        RequestDelegate _next;
        public GreetingMiddleware(RequestDelegate next)
        {
            _next = next;
        }

        public async Task Invoke(HttpContext context)
        {
            context.Items["Greetings"] = "Hello world from GreetingMiddleware";
            await _next(context);
        }
    }


    public class Startup
    {
        public Startup(IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are two services available at constructor
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddTransient<IStartupFilter, GreetingStartupFilter>();
        }


        public void Configure(IApplicationBuilder app)
        {
            
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

using System.Threading.Tasks;

using System; //IStartupFilter

namespace WebApplication1

{

public class GreetingStartupFilter : IStartupFilter

{

public Action<IApplicationBuilder> Configure(Action<IApplicationBuilder> next)

{

return builder =>

{

builder.UseMiddleware<GreetingMiddleware>();

builder.UseMiddleware<HelloWorldMiddleware>();

next(builder);

};

}

public class HelloWorldMiddleware

{

public HelloWorldMiddleware(RequestDelegate next)

{

}

public async Task Invoke(HttpContext context)

{

await context.Response.WriteAsync($"{context.Items["Greetings"]}");

}

public class GreetingMiddleware

{

RequestDelegate _next;

public GreetingMiddleware(RequestDelegate next)

{

_next = next;

}

public async Task Invoke(HttpContext context)

{

context.Items["Greetings"] = "Hello world from GreetingMiddleware";

await _next(context);

}

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void ConfigureServices(IServiceCollection services)

{

services.AddTransient<IStartupFilter, GreetingStartupFilter>();

}

public void Configure(IApplicationBuilder app)

{

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 : Hello world from GreetingMiddleware

hello-world-startup-istartup


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are two services available at constructor
        }

        public void Configure(IApplicationBuilder app)
        {
            //With normal startup class these two variables are available from the parameters of Configure method
            var env = (IHostingEnvironment)app.ApplicationServices.GetService(typeof(IHostingEnvironment));
            var logger = (ILoggerFactory)app.ApplicationServices.GetService(typeof(ILoggerFactory));
            app.Run(async context =>
            {
                await context.Response.WriteAsync($"{env.EnvironmentName}");
            });
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

namespace WebApplication1

{

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void Configure(IApplicationBuilder app)

{

//With normal startup class these two variables are available from the parameters of Configure method

var env = (IHostingEnvironment)app.ApplicationServices.GetService(typeof(IHostingEnvironment));

var logger = (ILoggerFactory)app.ApplicationServices.GetService(typeof(ILoggerFactory));

app.Run(async context =>

{

await context.Response.WriteAsync($"{env.EnvironmentName}");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 :Development

hello-world-startup-capture-errors


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection
using Microsoft.Extensions.Primitives; //StringValues
using System; //Exception

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are two services available at constructor
        }

        public void ConfigureServices(IServiceCollection services)
        {
            throw new Exception("error here");
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            app.Run(context =>
            {
                return context.Response.WriteAsync($"Request {context.Request.Method}");
            });
        }
    }



    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
             .UseSetting("detailedErrors", "true")
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

using Microsoft.Extensions.Primitives; //StringValues

using System; //Exception

namespace WebApplication1

{

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void ConfigureServices(IServiceCollection services)

{

throw new Exception("error here");

}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

app.Run(context =>

{

return context.Response.WriteAsync($"Request {context.Request.Method}");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseSetting("detailedErrors", "true")

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 : An error occurred while starting the application. Exception: error here WebApplication1.Startup.ConfigureServices(IServiceCollection services) in Program.cs, line 21 Exception: error here WebApplication1.Startup.ConfigureServices(IServiceCollection services) in Program.cs 21. throw new Exception(“error here”); Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services) Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices() Microsoft.AspNetCore.Hosting.Internal.WebHost.Initialize() Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication() Show raw exception details .NET Core 4.6.28008.02 X64 v4.0.0.0 | Microsoft.AspNetCore.Hosting version 2.2.7-servicing-10089 | Microsoft Windows 10.0.18362 | Need… Read More »

hello-world-startup-basic-request-verb


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection
using Microsoft.Extensions.Primitives; //StringValues

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are two services available at constructor
        }

        public void ConfigureServices(IServiceCollection services)
        {
            //This is the only service available at ConfigureServices
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            app.Run(context =>
            {
                return context.Response.WriteAsync($"Request {context.Request.Method}");
            });
        }
    }



    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

using Microsoft.Extensions.Primitives; //StringValues

namespace WebApplication1

{

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void ConfigureServices(IServiceCollection services)

{

//This is the only service available at ConfigureServices

}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

app.Run(context =>

{

return context.Response.WriteAsync($"Request {context.Request.Method}");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 : Request GET

hello-world-startup-basic-request-query-string-3


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection
using Microsoft.Extensions.Primitives; //StringValues

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are two services available at constructor
        }

        public void ConfigureServices(IServiceCollection services)
        {
            //This is the only service available at ConfigureServices
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            app.Run(async context =>
            {
                context.Response.Headers.Add("content-type", "text/html");

                await context.Response.WriteAsync("<html><body>");
                await context.Response.WriteAsync("<h1>All query string</h1>");
                await context.Response.WriteAsync(@"<a href=""?message=hello&message=world&message=again&isTrue=1&morning=good"">click this link to add query string</a><br/><br/>");
                await context.Response.WriteAsync("<ul>");
                foreach (var v in context.Request.Query)
                {
                    string str = v.Value; //implicit conversion from StringValues to String
                    await context.Response.WriteAsync($"<li>{v.Key} - {str}</li>");
                }
                await context.Response.WriteAsync("</ul>");
                await context.Response.WriteAsync("</body></html>");
            });
        }
    }



    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

using Microsoft.Extensions.Primitives; //StringValues

namespace WebApplication1

{

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void ConfigureServices(IServiceCollection services)

{

//This is the only service available at ConfigureServices

}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

app.Run(async context =>

{

context.Response.Headers.Add("content-type", "text/html");

await context.Response.WriteAsync("<html><body>");

await context.Response.WriteAsync("<h1>All query string</h1>");

await context.Response.WriteAsync(@"<a href=""?message=hello&message=world&message=again&isTrue=1&morning=good"">click this link to add query string</a><br/><br/>");

await context.Response.WriteAsync("<ul>");

foreach (var v in context.Request.Query)

{

string str = v.Value; //implicit conversion from StringValues to String

await context.Response.WriteAsync($"<li>{v.Key} - {str}</li>");

}

await context.Response.WriteAsync("</ul>");

await context.Response.WriteAsync("</body></html>");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 : All query string click this link to add query string •message – hello,world,again •isTrue – 1 •morning – good

hello-world-startup-basic-request-query-string-2


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection
using Microsoft.Extensions.Primitives; //StringValues

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are two services available at constructor
        }

        public void ConfigureServices(IServiceCollection services)
        {
            //This is the only service available at ConfigureServices
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            app.Run(async context =>
            {
                context.Response.Headers.Add("content-type", "text/html");

                StringValues queryString = context.Request.Query["message"];

                await context.Response.WriteAsync("<html><body>");
                await context.Response.WriteAsync("<h1>Query String with multiple values</h1>");
                await context.Response.WriteAsync(@"<a href=""?message=hello&message=world&message=again"">click this link to add query string</a><br/><br/>");
                await context.Response.WriteAsync("<ul>");
                foreach (string v in queryString)
                {
                    await context.Response.WriteAsync($"<li>{v}</li>");
                }
                await context.Response.WriteAsync("</ul>");
                await context.Response.WriteAsync("</body></html>");
            });
        }
    }



    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

using Microsoft.Extensions.Primitives; //StringValues

namespace WebApplication1

{

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void ConfigureServices(IServiceCollection services)

{

//This is the only service available at ConfigureServices

}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

app.Run(async context =>

{

context.Response.Headers.Add("content-type", "text/html");

StringValues queryString = context.Request.Query["message"];

await context.Response.WriteAsync("<html><body>");

await context.Response.WriteAsync("<h1>Query String with multiple values</h1>");

await context.Response.WriteAsync(@"<a href=""?message=hello&message=world&message=again"">click this link to add query string</a><br/><br/>");

await context.Response.WriteAsync("<ul>");

foreach (string v in queryString)

{

await context.Response.WriteAsync($"<li>{v}</li>");

}

await context.Response.WriteAsync("</ul>");

await context.Response.WriteAsync("</body></html>");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 : Query String with multiple values click this link to add query string •hello •world •again

hello-world-startup-basic-request-query-string


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection
using Microsoft.Extensions.Primitives; //StringValues

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are two services available at constructor
        }

        public void ConfigureServices(IServiceCollection services)
        {
            //This is the only service available at ConfigureServices
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            app.Run(async context =>
            {
                context.Response.Headers.Add("content-type", "text/html");

                StringValues queryString = context.Request.Query["message"];

                await context.Response.WriteAsync("<html><body>");
                await context.Response.WriteAsync("<h1>Query String with a single value</h1>");
                await context.Response.WriteAsync(@"<a href=""?message=hello world"">click this link to add query string</a><br/><br/>");
                await context.Response.WriteAsync($"'Message' query string: {queryString}");
                await context.Response.WriteAsync("</body></html>");
            });
        }
    }



    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

using Microsoft.Extensions.Primitives; //StringValues

namespace WebApplication1

{

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void ConfigureServices(IServiceCollection services)

{

//This is the only service available at ConfigureServices

}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

app.Run(async context =>

{

context.Response.Headers.Add("content-type", "text/html");

StringValues queryString = context.Request.Query["message"];

await context.Response.WriteAsync("<html><body>");

await context.Response.WriteAsync("<h1>Query String with a single value</h1>");

await context.Response.WriteAsync(@"<a href=""?message=hello world"">click this link to add query string</a><br/><br/>");

await context.Response.WriteAsync($"'Message' query string: {queryString}");

await context.Response.WriteAsync("</body></html>");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 : Query String with a single value click this link to add query string ‘Message’ query string: hello world

hello-world-startup-basic-request-headers-typed


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection
using System.Linq;

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are two services available at constructor
        }

        public void ConfigureServices(IServiceCollection services)
        {
            //This is the only service available at ConfigureServices
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            app.Run(context =>
            {
                var typedHeaders = context.Request.GetTypedHeaders();

                return context.Response.WriteAsync($@"
                                There are more common HTTP headers properties available in HttpContext.Request.GetTypedHeaders()              
                                Accept: {typedHeaders.Accept[0]}
                                Accept Language : {typedHeaders.AcceptLanguage.FirstOrDefault()?.Value} // 오류남 주석처리                
                ");
            });
        }
    }



    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

using System.Linq;

namespace WebApplication1

{

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void ConfigureServices(IServiceCollection services)

{

//This is the only service available at ConfigureServices

}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

app.Run(context =>

{

var typedHeaders = context.Request.GetTypedHeaders();

return context.Response.WriteAsync($@"

There are more common HTTP headers properties available in HttpContext.Request.GetTypedHeaders()

Accept: {typedHeaders.Accept[0]}

Accept Language : {typedHeaders.AcceptLanguage.FirstOrDefault()?.Value} // 오류남 주석처리

");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 : There are more common HTTP headers properties available in HttpContext.Request.GetTypedHeaders()Accept: text/html

hello-world-startup-basic-request-headers-names


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection
using Microsoft.Net.Http.Headers;
using System.Reflection; //List
using System;
using System.Collections.Generic; //Type
using System.Linq; //Where

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are two services available at constructor
        }

        public void ConfigureServices(IServiceCollection services)
        {
            //This is the only service available at ConfigureServices
        }

        private List<FieldInfo> GetConstants(Type type)
        {
            FieldInfo[] fieldInfos = type.GetFields(BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy);

            return fieldInfos.Where(fi => fi.IsLiteral && !fi.IsInitOnly).ToList();
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            app.Run(async context =>
            {
                context.Response.Headers.Add(HeaderNames.ContentType, "text/html");

                await context.Response.WriteAsync("<h1>Request Headers from Microsoft.Net.Http.Headers.HeaderNames</h1>");
                await context.Response.WriteAsync("<ul>");
                foreach (var h in GetConstants(typeof(HeaderNames)))
                {
                    await context.Response.WriteAsync($"<li>{h.Name} = {h.GetValue(h)}</li>");
                }
                await context.Response.WriteAsync("</ul>");
            });
        }
    }



    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseUrls("http://*:1000", "http://*:5000")
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

using Microsoft.Net.Http.Headers;

using System.Reflection; //List

using System;

using System.Collections.Generic; //Type

using System.Linq; //Where

namespace WebApplication1

{

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void ConfigureServices(IServiceCollection services)

{

//This is the only service available at ConfigureServices

}

private List<FieldInfo> GetConstants(Type type)

{

FieldInfo[] fieldInfos = type.GetFields(BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy);

return fieldInfos.Where(fi => fi.IsLiteral && !fi.IsInitOnly).ToList();

}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

app.Run(async context =>

{

context.Response.Headers.Add(HeaderNames.ContentType, "text/html");

await context.Response.WriteAsync("<h1>Request Headers from Microsoft.Net.Http.Headers.HeaderNames</h1>");

await context.Response.WriteAsync("<ul>");

foreach (var h in GetConstants(typeof(HeaderNames)))

{

await context.Response.WriteAsync($"<li>{h.Name} = {h.GetValue(h)}</li>");

}

await context.Response.WriteAsync("</ul>");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseUrls("http://*:1000", "http://*:5000")

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과 : Request Headers from Microsoft.Net.Http.Headers.HeaderNames •Accept = Accept •AcceptCharset = Accept-Charset •AcceptEncoding = Accept-Encoding •AcceptLanguage = Accept-Language •AcceptRanges = Accept-Ranges •AccessControlAllowCredentials = Access-Control-Allow-Credentials •AccessControlAllowHeaders = Access-Control-Allow-Headers •AccessControlAllowMethods = Access-Control-Allow-Methods •AccessControlAllowOrigin = Access-Control-Allow-Origin •AccessControlExposeHeaders = Access-Control-Expose-Headers •AccessControlMaxAge = Access-Control-Max-Age •AccessControlRequestHeaders = Access-Control-Request-Headers •AccessControlRequestMethod = Access-Control-Request-Method •Age = Age •Allow = Allow •Authority = :authority… Read More »