[C#/ASP.NET MVC/.NETCORE] IExceptionHandlerPathFeature 인터페이스 : 오류 처리기 컨트롤러 또는 페이지에서 예외 및 요청 경로 구하기

TestProject.zip

다운로드

▶ Properties/launchSettings.json

{
    "iisSettings" :
    {
        "windowsAuthentication"   : false,
        "anonymousAuthentication" : true,
        "iisExpress"              :
        {
            "applicationUrl" : "http://localhost:11944",
            "sslPort"        : 44399
        }
    },
    "profiles" :
    {
        "IIS Express" :
        {
            "commandName"          : "IISExpress",
            "launchBrowser"        : true,
            "environmentVariables" :
            {
                "ASPNETCORE_ENVIRONMENT" : "Production"
            }
        },
        "TestProject" :
        {
            "commandName"          : "Project",
            "launchBrowser"        : true,
            "applicationUrl"       : "https://localhost:5001;http://localhost:5000",
            "environmentVariables" :
            {
                "ASPNETCORE_ENVIRONMENT" : "Production"
            }
        }
    }
}

 

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▶ Startup.cs

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

namespace TestProject
{
    /// <summary>
    /// 시작
    /// </summary>
    public class Startup
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Property
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 구성 - Configuration

        /// <summary>
        /// 구성
        /// </summary>
        public IConfiguration Configuration { get; }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - Startup(configuration)

        /// <summary>
        /// 생성자
        /// </summary>
        /// <param name="configuration">구성</param>
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 서비스 컬렉션 구성하기 - ConfigureServices(services)

        /// <summary>
        /// 서비스 컬렉션 구성하기
        /// </summary>
        /// <param name="services">서비스 컬렉션</param>
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddRazorPages();
        }

        #endregion
        #region 구성하기 - Configure(app, environment)

        /// <summary>
        /// 구성하기
        /// </summary>
        /// <param name="app">애플리케이션 빌더</param>
        /// <param name="environment">웹 호스트 환경</param>
        public void Configure(IApplicationBuilder app, IWebHostEnvironment environment)
        {
            if(environment.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");

                app.UseHsts();
            }

            app.UseHttpsRedirection();

            app.UseStaticFiles();

            app.UseRouting();

            app.UseAuthorization();

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

        #endregion
    }
}

 

▶ Pages/Index.cshtml.cs

using Microsoft.AspNetCore.Mvc.RazorPages;
using System;

namespace TestProject.Pages
{
    /// <summary>
    /// 인덱스 모델
    /// </summary>
    public class IndexModel : PageModel
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region GET 요청시 처리하기 - OnGet()

        /// <summary>
        /// GET 요청시 처리하기
        /// </summary>
        public void OnGet()
        {
            throw new Exception();
        }

        #endregion
    }
}

 

▶ Pages/Error.cshtml.cs

using Microsoft.AspNetCore.Diagnostics;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.Diagnostics;
using System.IO;
using System.Text;

namespace TestProject.Pages
{
    /// <summary>
    /// 에러 모델
    /// </summary>
    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
    public class ErrorModel : PageModel
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Property
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 요청 ID - RequestID

        /// <summary>
        /// 요청 ID
        /// </summary>
        public string RequestID { get; set; }

        #endregion
        #region 요청 ID 표시 여부 - ShowRequestID

        /// <summary>
        /// 요청 ID 표시 여부
        /// </summary>
        public bool ShowRequestID => !string.IsNullOrEmpty(RequestID);

        #endregion
        #region 예외 메시지 - ExceptionMessage

        /// <summary>
        /// 예외 메시지
        /// </summary>
        public string ExceptionMessage { get; set; }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - ErrorModel()

        /// <summary>
        /// 생성자
        /// </summary>
        public ErrorModel()
        {
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region GET 요청시 처리하기 - OnGet()

        /// <summary>
        /// GET 요청시 처리하기
        /// </summary>
        public void OnGet()
        {
            RequestID = Activity.Current?.Id ?? HttpContext.TraceIdentifier;

            IExceptionHandlerPathFeature feature = HttpContext.Features.Get<IExceptionHandlerPathFeature>();

            StringBuilder stringBuilder = new StringBuilder();

            if(feature?.Error is FileNotFoundException)
            {
                stringBuilder.Append("File error thrown");
            }
            else
            {
                stringBuilder.Append("Error thrown");
            }

            if(feature?.Path == "/" || feature?.Path == "/index")
            {
                stringBuilder.Append(" from home page");
            }
            else
            {
                stringBuilder.Append($" from {feature?.Path}");
            }

            ExceptionMessage = stringBuilder.ToString();
        }

        #endregion
    }
}