Text Plain in ASP.NET Core 3 Web API

On the Visual Studio, create new ASP.NET Core Web Application project

Input Project Name and select Project Location




Select Empty Template and click Create button to Finish

Structure of New Project




Open Startup.cs file and add new configurations as below:

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace LearnASPNETCore3WebAPIWithRealApps
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }
}

Create new folder named Controllers. In this folder, create new controller named DemoController.cs as below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

namespace LearnASPNETCore3WebAPIWithRealApps.Controllers
{
    [Route("api/demo")]
    public class DemoController : Controller
    {
        [Produces("text/plain")]
        [HttpGet("demo1")]
        public async Task<IActionResult> Demo1()
        {
            try
            {
                string result = "Hello World";
                return Ok(result);
            }
            catch
            {
                return BadRequest();
            }
        }
    }
}




Access Web API use the following url: http://localhost:18942/api/demo/demo1

Output

Hello World




Create Console App (.NET Framework) Project in Visual Studio.

DemoRestClientModel class contain methods call Web API

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace LearnASPNETCore3WebAPIWithRealApps_Client
{
    public class DemoRestClientModel
    {
        private string BASE_URL = "http://localhost:18942/api/demo/";

        public Task<HttpResponseMessage> Demo1()
        {
            try
            {
                HttpClient client = new HttpClient();
                client.BaseAddress = new Uri(BASE_URL);
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/plain"));
                return client.GetAsync("demo1");
            }
            catch
            {
                return null;
            }
        }
    }
}




using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

namespace LearnASPNETCore3WebAPIWithRealApps_Client
{
    class Program
    {
        static void Main(string[] args)
        {
            DemoRestClientModel demoRestClientModel = new DemoRestClientModel();

            HttpResponseMessage httpResponseMessage = demoRestClientModel.Demo1().Result;

            HttpStatusCode httpStatusCode = httpResponseMessage.StatusCode;
            Console.WriteLine("Status Code: " + httpStatusCode);

            bool isSuccessStatusCode = httpResponseMessage.IsSuccessStatusCode;
            Console.WriteLine("IsSuccessStatusCode: " + isSuccessStatusCode);

            string result = httpResponseMessage.Content.ReadAsStringAsync().Result;
            Console.WriteLine("Result: " + result);

            Console.ReadLine();
        }
    }
}
Status Code: OK
IsSuccessStatusCode: True
Result: Hello World