添加中间件基类，和测试项目

.gitignore

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+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+zx_web/Files/errs/
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# DNX
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
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+*.pch
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+*.pgc
+*.pgd
+*.rsp
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+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
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+# Chutzpah Test files
+_Chutzpah*
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+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
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+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
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+AutoTest.Net/
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+# Web workbench (sass)
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+# Installshield output folder
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+DocProject/Help/*.HxT
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+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
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+# Publish Web Output
+*.[Pp]ublish.xml
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+# TODO: Comment the next line if you want to checkin your web deploy settings
+# but database connection strings (with potential passwords) will be unencrypted
+#*.pubxml
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+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
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+# NuGet Packages
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+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignoreable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
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+# Windows Store app package directories and files
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+Package.StoreAssociation.xml
+_pkginfo.txt
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+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
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+# Others
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+~$*
+*~
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+*.jfm
+*.pfx
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+node_modules/
+orleans.codegen.cs
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
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+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
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+# SQL Server files
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+# Business Intelligence projects
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+FakesAssemblies/
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+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+# CodeRush
+.cr/
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc

Falcon.Middleware.Test/Falcon.Middleware.Test.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Falcon.Middleware\Falcon.Middleware.csproj" />
+  </ItemGroup>
+
+</Project>

Falcon.Middleware.Test/MiddlewareTest.cs

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+using Microsoft.AspNetCore.Http;
+
+namespace Falcon.Middleware.Test
+{
+    /// <summary>
+    /// 测试中间件
+    /// </summary>
+    public class MiddlewareTest:MiddlewareBase
+    {
+        public MiddlewareTest(RequestDelegate next) : base(next) {
+        }
+
+        public async override void InvokeNextAfter(HttpContext context) {
+            await context.Response.WriteAsync("\nInvokeNextAfter");
+        }
+
+        public async override void InvokeNextBefore(HttpContext context) {
+            await context.Response.WriteAsync("InvokeNextBefore\n");
+        }
+    }
+}

Falcon.Middleware.Test/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace Falcon.Middleware.Test
+{
+    public class Program
+    {
+        public static void Main(string[] args) {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder => {
+                    webBuilder.UseStartup<Startup>();
+                });
+    }
+}

Falcon.Middleware.Test/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:54835",
+      "sslPort": 44313
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "Falcon.Middleware.Test": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "https://localhost:5001;http://localhost:5000"
+    }
+  }
+}

Falcon.Middleware.Test/Startup.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+namespace Falcon.Middleware.Test
+{
+    public class Startup
+    {
+        // This method gets called by the runtime. Use this method to add services to the container.
+        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
+        public void ConfigureServices(IServiceCollection services) {
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app,IWebHostEnvironment env) {
+            if(env.IsDevelopment()) {
+                app.UseDeveloperExceptionPage();
+            }
+
+            app.UseRouting();
+
+            app.UseMiddleware<MiddlewareTest>();
+
+            app.UseEndpoints(endpoints => {
+                endpoints.MapGet("/",async context => {
+                    await context.Response.WriteAsync("Hello World!");
+                });
+            });
+        }
+    }
+}

Falcon.Middleware.Test/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

Falcon.Middleware.Test/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  },
+  "AllowedHosts": "*"
+}

Falcon.Middleware.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29519.181
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Falcon.Middleware", "Falcon.Middleware\Falcon.Middleware.csproj", "{2CE8DCF8-DF9B-43E5-A58F-784D81E860FA}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Falcon.Middleware.Test", "Falcon.Middleware.Test\Falcon.Middleware.Test.csproj", "{B3648E4E-6F09-4923-BC93-5CD7465194A7}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2CE8DCF8-DF9B-43E5-A58F-784D81E860FA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2CE8DCF8-DF9B-43E5-A58F-784D81E860FA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2CE8DCF8-DF9B-43E5-A58F-784D81E860FA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2CE8DCF8-DF9B-43E5-A58F-784D81E860FA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B3648E4E-6F09-4923-BC93-5CD7465194A7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B3648E4E-6F09-4923-BC93-5CD7465194A7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B3648E4E-6F09-4923-BC93-5CD7465194A7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B3648E4E-6F09-4923-BC93-5CD7465194A7}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {CD4BC7F0-448C-463F-8A57-FDE10F3F849F}
+	EndGlobalSection
+EndGlobal

Falcon.Middleware/Falcon.Middleware.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
+    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+    <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
+    <Authors>Falcon</Authors>
+    <Company>Falcon</Company>
+    <Description>DOTNET Core 中间件帮助</Description>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
+    <PackageProjectUrl>http://39.105.71.191/Falcon/Falcon.Middleware</PackageProjectUrl>
+    <RepositoryUrl>http://39.105.71.191/Falcon/Falcon.Middleware</RepositoryUrl>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.2.0" />
+  </ItemGroup>
+
+</Project>

Falcon.Middleware/MiddlewareBase.cs

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+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+
+namespace Falcon.Middleware
+{
+    /// <summary>
+    /// 中间件基类
+    /// </summary>
+    public abstract class MiddlewareBase
+    {
+        private readonly RequestDelegate _next;
+
+        /// <summary>
+        /// 通过请求代理构造中间件
+        /// </summary>
+        /// <param name="next">下一个中间件</param>
+        public MiddlewareBase(RequestDelegate next) {
+            _next = next;
+        }
+        /// <summary>
+        /// 异步执行中间件
+        /// </summary>
+        /// <param name="context">请求上下文</param>
+        /// <returns></returns>
+        public async Task InvokeAsync(HttpContext context) {
+            InvokeNextBefore(context);
+            await _next(context);
+            InvokeNextAfter(context);
+        }
+        /// <summary>
+        /// 在执行下一个中间件之前执行
+        /// </summary>
+        /// <param name="context">请求上下文</param>
+        public abstract void InvokeNextBefore(HttpContext context);
+        /// <summary>
+        /// 在执行下一个中间件之后执行
+        /// </summary>
+        /// <param name="context">请求上下文</param>
+        public abstract void InvokeNextAfter(HttpContext context);
+    }
+}