之前的博文?ASP.NET Core中顯示自定義錯誤頁面?中的方法是在項目中硬編碼實現的，當有多個項目時，就會造成不同項目之間的重復代碼，不可取。

在這篇博文中改用middleware實現，并且放在獨立的項目中發布成NuGet包，項目中使用時只需安裝NuGet包，然后在Startup的Configure()方法中添加如下的一行代碼。

app.UseCustomErrorPages();

CustomErrorPagesMiddleware的實現代碼如下：

public class CustomErrorPagesMiddleware {private readonly RequestDelegate _next;private readonly ILogger _logger;public CustomErrorPagesMiddleware(RequestDelegate next,ILoggerFactory loggerFactory){_next = next;_logger = loggerFactory.CreateLogger<CustomErrorPagesMiddleware>();}public async Task Invoke(HttpContext context){try{await _next(context);}catch (Exception ex){_logger.LogError(0, ex, "An unhandled exception has occurred while executing the request");if (context.Response.HasStarted){_logger.LogWarning("The response has already started, the error page middleware will not be executed.");throw;}try{context.Response.Clear();context.Response.StatusCode = 500;return;}catch (Exception ex2){_logger.LogError(0, ex2, "An exception was thrown attempting to display the error page.");}throw;}finally{var statusCode = context.Response.StatusCode;if (statusCode == 404 || statusCode == 500){await ErrorPage.ResponseAsync(context.Response, statusCode);}}} }

ErrorPage的實現代碼如下：

public static class ErrorPage {public static async Task ResponseAsync(HttpResponse response, int statusCode){if (statusCode == 404){await response.WriteAsync(Page404);}else if (statusCode == 500){await response.WriteAsync(Page500);}}private static string Page404 => @"html...";private static string Page500 => @"html..."; }

CustomErrorPagesExtensions的實現代碼如下：

public static class CustomErrorPagesExtensions {public static IApplicationBuilder UseCustomErrorPages(this IApplicationBuilder app){if (app == null){throw new ArgumentNullException(nameof(app));}return app.UseMiddleware<CustomErrorPagesMiddleware>();} }

代碼參考自：

1）CustomErrorPagesMiddleware.cs

2）DeveloperExceptionPageMiddleware.cs

總結

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