Author Archives: 관리자

middleware-10


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

namespace WebApplication1
{  
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
        }

        public void Configure(IApplicationBuilder app)
        {
            app.UseMiddleware(typeof(TerminalMiddleware));
        }
    }

    public class TerminalMiddleware
    {
        DateTime _date = DateTime.Now;

        public TerminalMiddleware(RequestDelegate next)
        {
        }

        public async Task Invoke(HttpContext context, ILogger<TerminalMiddleware> log)
        {
            log.LogDebug($"Request: {context.Request.Path}");
            context.Response.Headers.Add("Content-Type", "text/plain");
            await context.Response.WriteAsync($"Middleware is singleton. Keep refreshing the page. You will see that the date does not change {_date}.");
        }
    }

    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");
        }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using System.Threading.Tasks;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Logging;

using Microsoft.AspNetCore;

using System;

namespace WebApplication1

{

public class Startup

{

public void ConfigureServices(IServiceCollection services)

{

}

public void Configure(IApplicationBuilder app)

{

app.UseMiddleware(typeof(TerminalMiddleware));

}

public class TerminalMiddleware

{

DateTime _date = DateTime.Now;

public TerminalMiddleware(RequestDelegate next)

{

}

public async Task Invoke(HttpContext context, ILogger<TerminalMiddleware> log)

{

log.LogDebug($"Request: {context.Request.Path}");

context.Response.Headers.Add("Content-Type", "text/plain");

await context.Response.WriteAsync($"Middleware is singleton. Keep refreshing the page. You will see that the date does not change {_date}.");

}

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");

}

결과 : Middleware is singleton. Keep refreshing the page. You will see that the date does not change 2019-09-25 오후 5:32:41.

middleware-9


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Builder.Extensions;
using Microsoft.AspNetCore;

namespace WebApplication1
{
    public class Greeting
    {
        public string Greet() => "Good morning";
    }

    public class Goodbye
    {
        public string Say() => "Goodbye";
    }

    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton<Greeting>();
            services.AddSingleton<Goodbye>();
        }

        public void Configure(IApplicationBuilder app)
        {
            app.UseMiddleware(typeof(TerminalMiddleware));
        }
    }

    public class TerminalMiddleware
    {
        Greeting _greet;

        public TerminalMiddleware(RequestDelegate next, Greeting greet)
        {
            _greet = greet;
        }

        public async Task Invoke(HttpContext context, Goodbye goodbye)
        {
            await context.Response.WriteAsync($"{_greet.Greet()} {goodbye.Say()}");
        }
    }

    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");
        }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using System.Threading.Tasks;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.AspNetCore.Builder.Extensions;

using Microsoft.AspNetCore;

namespace WebApplication1

{

public class Greeting

{

public string Greet() => "Good morning";

}

public class Goodbye

{

public string Say() => "Goodbye";

}

public class Startup

{

public void ConfigureServices(IServiceCollection services)

{

services.AddSingleton<Greeting>();

services.AddSingleton<Goodbye>();

}

public void Configure(IApplicationBuilder app)

{

app.UseMiddleware(typeof(TerminalMiddleware));

}

public class TerminalMiddleware

{

Greeting _greet;

public TerminalMiddleware(RequestDelegate next, Greeting greet)

{

_greet = greet;

}

public async Task Invoke(HttpContext context, Goodbye goodbye)

{

await context.Response.WriteAsync($"{_greet.Greet()} {goodbye.Say()}");

}

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");

}

결과: Good morning Goodbye

middleware-8


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Builder.Extensions;
using Microsoft.AspNetCore;

namespace WebApplication1
{
    public class Content
    {
        public string SayHello() => "Hello world";
    }

    public class Greeting
    {
        public string Greet() => "Good morning";
    }

    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton<Content>();
        }

        public void Configure(IApplicationBuilder app)
        {
            //Pay attention to the order of the parameter passed.
            //If your parameter is distinct, the order does not matter, As you can see here we put Greeting
            //at the end of the parameter passing although in the constructor Greeting was the second on the parameter list.
            //However if you pass multiple parameters of the same type, the order matters. 
            app.UseMiddleware<TerminalMiddleware>("Cairo", "Dody", new Greeting());
        }
    }

    public class TerminalMiddleware
    {
        readonly Content _content;
        readonly string _city;
        readonly Greeting _greet;
        readonly string _name;

        public TerminalMiddleware(RequestDelegate next, Greeting greet, string city, Content cnt, string name)
        {
            //We are not using the parameter next in this middleware since this middleware is terminal
            _content = cnt;
            _city = city;
            _greet = greet;
            _name = name;
        }
        public async Task Invoke(HttpContext context)
        {
            await context.Response.WriteAsync($"{_greet.Greet()} {_name}, {_content.SayHello()} from {_city}");
        }
    }

    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");
        }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using System.Threading.Tasks;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.AspNetCore.Builder.Extensions;

using Microsoft.AspNetCore;

namespace WebApplication1

{

public class Content

{

public string SayHello() => "Hello world";

}

public class Greeting

{

public string Greet() => "Good morning";

}

public class Startup

{

public void ConfigureServices(IServiceCollection services)

{

services.AddSingleton<Content>();

}

public void Configure(IApplicationBuilder app)

{

//Pay attention to the order of the parameter passed.

//If your parameter is distinct, the order does not matter, As you can see here we put Greeting

//at the end of the parameter passing although in the constructor Greeting was the second on the parameter list.

//However if you pass multiple parameters of the same type, the order matters.

app.UseMiddleware<TerminalMiddleware>("Cairo", "Dody", new Greeting());

}

public class TerminalMiddleware

{

readonly Content _content;

readonly string _city;

readonly Greeting _greet;

readonly string _name;

public TerminalMiddleware(RequestDelegate next, Greeting greet, string city, Content cnt, string name)

{

//We are not using the parameter next in this middleware since this middleware is terminal

_content = cnt;

_city = city;

_greet = greet;

_name = name;

}

public async Task Invoke(HttpContext context)

{

await context.Response.WriteAsync($"{_greet.Greet()} {_name}, {_content.SayHello()} from {_city}");

}

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");

}

결과 : Good morning Dody, Hello world from Cairo

middleware-7


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Builder.Extensions;
using Microsoft.AspNetCore;

namespace WebApplication1
{
        public class Startup
        {
            public void Configure(IApplicationBuilder app)
            {
                //Use MapMiddleWare and MapWhenMiddlware directly
                var whenOption = new MapWhenOptions
                {
                    Branch =
                        context =>
                            context.Response.WriteAsync($"MapWhenMiddleware| Path: {context.Request.Path} - Path Base: {context.Request.PathBase}"),
                    Predicate = context => context.Request.Path.Value.Contains("hello")
                };

                app.UseMiddleware<MapWhenMiddleware>(whenOption);

                var mapOption = new MapOptions
                {
                    Branch =
                        context =>
                            context.Response.WriteAsync($"MapMiddleware| Path: {context.Request.Path} - Path Base: {context.Request.PathBase}"),
                    PathMatch = "/greetings"
                };

                app.UseMiddleware<MapMiddleware>(mapOption);

                app.Run(context =>
                {
                    context.Response.Headers.Add("content-type", "text/html");
                    return context.Response.WriteAsync(@"
                       <a href=""/hello"">/hello</a> <a href=""/greetings"">/greetings</a>
                    ");
                });
            }
    }

        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");
        }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using System.Threading.Tasks;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.AspNetCore.Builder.Extensions;

using Microsoft.AspNetCore;

namespace WebApplication1

{

public class Startup

{

public void Configure(IApplicationBuilder app)

{

//Use MapMiddleWare and MapWhenMiddlware directly

var whenOption = new MapWhenOptions

{

Branch =

context =>

context.Response.WriteAsync($"MapWhenMiddleware| Path: {context.Request.Path} - Path Base: {context.Request.PathBase}"),

Predicate = context => context.Request.Path.Value.Contains("hello")

};

app.UseMiddleware<MapWhenMiddleware>(whenOption);

var mapOption = new MapOptions

{

Branch =

context =>

context.Response.WriteAsync($"MapMiddleware| Path: {context.Request.Path} - Path Base: {context.Request.PathBase}"),

PathMatch = "/greetings"

};

app.UseMiddleware<MapMiddleware>(mapOption);

app.Run(context =>

{

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

return context.Response.WriteAsync(@"

<a href=""/hello"">/hello</a> <a href=""/greetings"">/greetings</a>

");

});

}

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");

}

결과: MapWhenMiddleware| Path: /hello – Path Base:

middleware-5


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost

namespace WebApplication1
{
        public class Startup
        {
            public void Configure(IApplicationBuilder app)
            {
                app.Map("/hello", (IApplicationBuilder pp) => {
                    //nested
                    app.Map("/world", (IApplicationBuilder ppa) => ppa.Run(context =>
                        context.Response.WriteAsync($"Path: {context.Request.Path} - Path Base: {context.Request.PathBase}")));

                    pp.Run(context =>
                        context.Response.WriteAsync($"Path: {context.Request.Path} - Path Base: {context.Request.PathBase}"));
                });

                app.Run(context =>
                {
                    context.Response.Headers.Add("content-type", "text/html");
                    return context.Response.WriteAsync(@"
                       <a href=""/hello"">/hello</a> <a href=""/hello/world"">/hello/world</a>
                    ");
                });
            }
        }

        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");
        }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

namespace WebApplication1

{

public class Startup

{

public void Configure(IApplicationBuilder app)

{

app.Map("/hello", (IApplicationBuilder pp) => {

//nested

app.Map("/world", (IApplicationBuilder ppa) => ppa.Run(context =>

context.Response.WriteAsync($"Path: {context.Request.Path} - Path Base: {context.Request.PathBase}")));

pp.Run(context =>

context.Response.WriteAsync($"Path: {context.Request.Path} - Path Base: {context.Request.PathBase}"));

});

app.Run(context =>

{

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

return context.Response.WriteAsync(@"

<a href=""/hello"">/hello</a> <a href=""/hello/world"">/hello/world</a>

");

});

}

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");

}


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost

namespace WebApplication1
{
        public class Startup
        {
            public void Configure(IApplicationBuilder app)
            {
                app.MapWhen(context => context.Request.Path.Value.Contains("/hello"),
                 (IApplicationBuilder pp) => {
                        //nested
                        app.Map("/world", (IApplicationBuilder ppa) => ppa.Run(context =>
                         context.Response.WriteAsync($"Path: {context.Request.Path} - Path Base: {context.Request.PathBase}")));

                     pp.Run(context =>
                         context.Response.WriteAsync($"Path: {context.Request.Path} - Path Base: {context.Request.PathBase}"));
                 });

                app.Run(context =>
                {
                    context.Response.Headers.Add("content-type", "text/html");
                    return context.Response.WriteAsync(@"
                       <a href=""/hello"">/hello</a> <a href=""/hello/world"">/hello/world</a>
                    ");
                });
            }
        }

        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");
        }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

namespace WebApplication1

{

public class Startup

{

public void Configure(IApplicationBuilder app)

{

app.MapWhen(context => context.Request.Path.Value.Contains("/hello"),

(IApplicationBuilder pp) => {

//nested

app.Map("/world", (IApplicationBuilder ppa) => ppa.Run(context =>

context.Response.WriteAsync($"Path: {context.Request.Path} - Path Base: {context.Request.PathBase}")));

pp.Run(context =>

context.Response.WriteAsync($"Path: {context.Request.Path} - Path Base: {context.Request.PathBase}"));

});

app.Run(context =>

{

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

return context.Response.WriteAsync(@"

<a href=""/hello"">/hello</a> <a href=""/hello/world"">/hello/world</a>

");

});

}

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");

}

결과 : Path: /world – Path Base: /hello

middleware-4


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost

namespace WebApplication1
{
        public class Startup
        {
            public void Configure(IApplicationBuilder app)
            {
                app.Map("/hello", (IApplicationBuilder pp) => pp.Run(context => context.Response.WriteAsync("/hello path")));
                app.Map("/world", (IApplicationBuilder pp) => pp.Run(context => context.Response.WriteAsync("/world path")));

                app.Run(context =>
                {
                    context.Response.Headers.Add("content-type", "text/html");
                    return context.Response.WriteAsync(@"
                       <a href=""/hello"">hello</a> <a href=""/world"">world</a>
                    ");
                });
            }
        }

        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");
        }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

namespace WebApplication1

{

public class Startup

{

public void Configure(IApplicationBuilder app)

{

app.Map("/hello", (IApplicationBuilder pp) => pp.Run(context => context.Response.WriteAsync("/hello path")));

app.Map("/world", (IApplicationBuilder pp) => pp.Run(context => context.Response.WriteAsync("/world path")));

app.Run(context =>

{

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

return context.Response.WriteAsync(@"

<a href=""/hello"">hello</a> <a href=""/world"">world</a>

");

});

}

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");

}

결과 : /hello path

middleware-3


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using System.IO;
using System.Threading.Tasks;


namespace WebApplication1
{
        public class Startup
        {
            public void Configure(IApplicationBuilder app)
            {
                app.UseMiddleware<TerminalMiddleware>();
            }
        }

        //A middleware class in ASP.NET Core is simply a class that 
        // - Take a constructor with RequestDelegate
        // - implements Invoke method taking HttpContext and returning Task
        //If you take a look at this code, it cannot be any simpler.
        //This is a terminal middleware. It does not invoke the subsequent middleware. It just returns its own response and that's it.

        public class TerminalMiddleware
        {
            public TerminalMiddleware(RequestDelegate next)
            {
                //We are not using the parameter next in this middleware since this middleware is terminal
            }

            public async Task Invoke(HttpContext context)
            {
                await context.Response.WriteAsync("Hello world");
            }
        }

        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");
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using System.IO;

using System.Threading.Tasks;

namespace WebApplication1

{

public class Startup

{

public void Configure(IApplicationBuilder app)

{

app.UseMiddleware<TerminalMiddleware>();

}

//A middleware class in ASP.NET Core is simply a class that

// - Take a constructor with RequestDelegate

// - implements Invoke method taking HttpContext and returning Task

//If you take a look at this code, it cannot be any simpler.

//This is a terminal middleware. It does not invoke the subsequent middleware. It just returns its own response and that's it.

public class TerminalMiddleware

{

public TerminalMiddleware(RequestDelegate next)

{

//We are not using the parameter next in this middleware since this middleware is terminal

}

public async Task Invoke(HttpContext context)

{

await context.Response.WriteAsync("Hello world");

}

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");

}

결과 : Hello world

middleware-2


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using System.IO;
using System.Threading.Tasks;


namespace WebApplication1
{
    public class Startup
    {
        public void Configure(IApplicationBuilder app)
        {
            //We use it the type so it is clear. We will use the shortened version from now on.
            //app.Use(next => context => FilterAsync(context, next));
            app.Use((RequestDelegate next) =>
            {
                return (HttpContext context) => BufferAsync(context, next);
            });

            app.Run(async context =>
            {
                context.Response.Headers.Add("content-type", "text/html");
                await context.Response.WriteAsync("<h1>This sample uses buffering</h1>");
                await context.Response.WriteAsync("<p>This allows all your Middlewares to write to Response.</p>");
            });
        }

        public async Task BufferAsync(HttpContext context, RequestDelegate next)
        {
            var body = context.Response.Body;
            var buffer = new MemoryStream();
            context.Response.Body = buffer;

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

                buffer.Position = 0;
                await buffer.CopyToAsync(body);
            }
            finally
            {
                context.Response.Body = body;
            }
        }
    }

    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");
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using System.IO;

using System.Threading.Tasks;

namespace WebApplication1

{

public class Startup

{

public void Configure(IApplicationBuilder app)

{

//We use it the type so it is clear. We will use the shortened version from now on.

//app.Use(next => context => FilterAsync(context, next));

app.Use((RequestDelegate next) =>

{

return (HttpContext context) => BufferAsync(context, next);

});

app.Run(async context =>

{

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

await context.Response.WriteAsync("<h1>This sample uses buffering</h1>");

await context.Response.WriteAsync("<p>This allows all your Middlewares to write to Response.</p>");

});

}

public async Task BufferAsync(HttpContext context, RequestDelegate next)

{

var body = context.Response.Body;

var buffer = new MemoryStream();

context.Response.Body = buffer;

try

{

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

await next(context);

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

buffer.Position = 0;

await buffer.CopyToAsync(body);

}

finally

{

context.Response.Body = body;

}

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");

}

결과 : This sample uses buffering This allows all your Middlewares to write to Response.

middleware-1


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.AspNetCore;
using System.Threading.Tasks;

namespace WebApplication1
{
    public class Startup
    {
        public void Configure(IApplicationBuilder app)
        {
            //The order of these things are important. 
            //Only one Middleware should write to the Response. 
            //Do not write to Response before next.Invoke()
            app.Use(async (context, next) =>
            {
                context.Items["Greeting"] = "Hello World";
                await next.Invoke();
                await context.Response.WriteAsync($"{context.Items["Greeting"]}\n");
                await context.Response.WriteAsync($"{context.Items["Goodbye"]}\n");
            });

            app.Use((context, next) =>
            {
                context.Items["Goodbye"] = "Goodbye for now";
                return Task.CompletedTask;
            });
        }
    }

    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");
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.AspNetCore;

using System.Threading.Tasks;

namespace WebApplication1

{

public class Startup

{

public void Configure(IApplicationBuilder app)

{

//The order of these things are important.

//Only one Middleware should write to the Response.

//Do not write to Response before next.Invoke()

app.Use(async (context, next) =>

{

context.Items["Greeting"] = "Hello World";

await next.Invoke();

await context.Response.WriteAsync($"{context.Items["Greeting"]}\n");

await context.Response.WriteAsync($"{context.Items["Goodbye"]}\n");

});

app.Use((context, next) =>

{

context.Items["Goodbye"] = "Goodbye for now";

return Task.CompletedTask;

});

}

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");

}

결과 : Hello World Goodbye for now

localization-4


pNetCore.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.Globalization;
using System.Collections.Generic;
using Microsoft.AspNetCore.Localization;
using Microsoft.Extensions.Localization;
using System;

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

        public void ConfigureServices(IServiceCollection services)
        {   
            services.AddLocalization(optipns => optipns.ResourcesPath = "resources"); // resources path 
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger, IStringLocalizerFactory stringLocalizerFactory)
        {
            var local = stringLocalizerFactory.Create("Common", typeof(Program).Assembly.FullName);

            var supportedCultures = new List<CultureInfo>
            {
                new CultureInfo("fr-FR"),
                new CultureInfo("en-US")
            };

            var options = new RequestLocalizationOptions
            {
                DefaultRequestCulture = new RequestCulture("fr-FR"),
                SupportedCultures = supportedCultures,
                SupportedUICultures = supportedCultures
            };

            app.UseRequestLocalization(options);
            
            app.Run(async context =>
            {
                var languageSwitch = context.Request.Query["lang"];

                try
                {
                    if (languageSwitch == "fr")
                    {
                        var val = CookieRequestCultureProvider.MakeCookieValue(new RequestCulture("fr-FR"));
                        context.Response.Cookies.Append(CookieRequestCultureProvider.DefaultCookieName, val);
                        context.Response.Redirect("/");
                        return;
                    }
                    else if (languageSwitch == "en")
                    {
                        var val = CookieRequestCultureProvider.MakeCookieValue(new RequestCulture("en-US"));
                        context.Response.Cookies.Append(CookieRequestCultureProvider.DefaultCookieName, val);
                        context.Response.Redirect("/");
                        return;
                    }
                }
                catch (Exception ex)
                {
                    await context.Response.WriteAsync($"error {ex.Message}");
                }

                await context.Response.WriteAsync($"<h1>CookieRequestCultureProvider</h1><p>We are using a cookie named \"{CookieRequestCultureProvider.DefaultCookieName}\" to switch the request culture.</p>");

                var requestCulture = context.Features.Get<IRequestCultureFeature>().RequestCulture;

                await context.Response.WriteAsync($@"
                Click <a href=""/?lang=fr"">here</a> for French cookie and <a href=""/?lang=en"">here</a> for English cookie.<br/><br/>
                
                Request Culture: {requestCulture.Culture} <br/> 
                Localized strings: {local["Hello"]} {local["Goodbye"]} {local["Yes"]} {local["No"]}
                ");
            });
        }
    }
    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");
    }
}

pNetCore.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.Globalization;

using System.Collections.Generic;

using Microsoft.AspNetCore.Localization;

using Microsoft.Extensions.Localization;

using System;

namespace WebApplication1

{

public class Startup

{

public Startup(IHostingEnvironment env, ILoggerFactory logger)

{

//These are two services available at constructor

}

public void ConfigureServices(IServiceCollection services)

{

services.AddLocalization(optipns => optipns.ResourcesPath = "resources"); // resources path

}

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

{

var local = stringLocalizerFactory.Create("Common", typeof(Program).Assembly.FullName);

var supportedCultures = new List<CultureInfo>

{

new CultureInfo("fr-FR"),

new CultureInfo("en-US")

};

var options = new RequestLocalizationOptions

{

DefaultRequestCulture = new RequestCulture("fr-FR"),

SupportedCultures = supportedCultures,

SupportedUICultures = supportedCultures

};

app.UseRequestLocalization(options);

app.Run(async context =>

{

var languageSwitch = context.Request.Query["lang"];

try

{

if (languageSwitch == "fr")

{

var val = CookieRequestCultureProvider.MakeCookieValue(new RequestCulture("fr-FR"));

context.Response.Cookies.Append(CookieRequestCultureProvider.DefaultCookieName, val);

context.Response.Redirect("/");

return;

}

else if (languageSwitch == "en")

{

var val = CookieRequestCultureProvider.MakeCookieValue(new RequestCulture("en-US"));

context.Response.Cookies.Append(CookieRequestCultureProvider.DefaultCookieName, val);

context.Response.Redirect("/");

return;

}

catch (Exception ex)

{

await context.Response.WriteAsync($"error {ex.Message}");

}

await context.Response.WriteAsync($"<h1>CookieRequestCultureProvider</h1><p>We are using a cookie named \"{CookieRequestCultureProvider.DefaultCookieName}\" to switch the request culture.</p>");

var requestCulture = context.Features.Get<IRequestCultureFeature>().RequestCulture;

await context.Response.WriteAsync($@"

Click <a href=""/?lang=fr"">here</a> for French cookie and <a href=""/?lang=en"">here</a> for English cookie.<br/><br/>

Request Culture: {requestCulture.Culture} <br/>

Localized strings: {local["Hello"]} {local["Goodbye"]} {local["Yes"]} {local["No"]}

");

});

}

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");

}

결과 : CookieRequestCultureProvider We are using a cookie named “.AspNetCore.Culture” to switch the request culture. Click here for French cookie and here for English cookie. Request Culture: fr-FR Localized strings: Bonjour Au Revoir Oui Non