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ASP.NET Core RC2 终于发布了（ ）。为了庆祝这次发布，我们将运行在 Ubuntu 服务器上的示例站点 升级到了 ASP.NET Core RC2 ，在这篇博文中分享一下我们在升级过程中遇到的问题。
一、安装.NET Core SDK
删除旧版 dotnet cli：
rm -rf /usr/share/dotnet
安装 .NET Core SDK：
curl -sSL https://raw.githubusercontent.com/dotnet/cli/rel/1.0.0/scripts/obtain/dotnet-install.sh | bash /dev/stdin --version 1.0.0-preview1-002702 --install-dir ~/dotnet
sudo ln -s ~/dotnet/dotnet /usr/local/bin
二、运行 dotnet restore 命令
遇到2个错误：
1） Unable to resolve 'Microsoft.AspNetCore.IISPlatformHandler (>= 1.0.0)' for '.NETCoreApp,Version=v1.0'
解决方法：在 project.json 中将 Microsoft.AspNetCore.IISPlatformHandler 改为 Microsoft.AspNetCore.Server.IISIntegration 。
2） Package Newtonsoft.Json 7.0.1 is not compatible with netcoreapp1.0 (.NETCoreApp,Version=v1.0)
解决方法：在 project.json 中将
"tools": { "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-*"} 改为
"tools": { "Microsoft.AspNetCore.Server.IISIntegration.Tools":{ "version":"1.0.0-*", "imports": "portable-net45+win8+dnxcore50" }} 详见博问：
三、运行 dotnet run 命令
遇到了不少错误：
1）
The type or namespace name 'IApplicationEnvironment' could not be found (are you missing a using directive or an assembly reference?)
解决方法：将 Startup.cs 中的 IApplicationEnvironment 改为 IHostingEnvironment，详见 。
2）
'IWebHostBuilder' does not contain a definition for 'UseDefaultHostingConfiguration' and no extension method 'UseDefaultHostingConfiguration' accepting a first argument of type 'IWebHostBuilder' could be found (are you missing a using directive or an assembly reference?)
解决方法：在 Program.cs 中删除 .UseDefaultHostingConfiguration(args)
3）
'IWebHostBuilder' does not contain a definition for 'UseIISPlatformHandlerUrl' and no extension method 'UseIISPlatformHandlerUrl' accepting a first argument of type 'IWebHostBuilder' could be found
解决方法：在 Program.cs 中将 .UseIISPlatformHandlerUrl() 改为 UseIISIntegration()
4）
'ConfigurationBuilder' does not contain a definition for 'SetBasePath' and no extension method 'SetBasePath' accepting a first argument of type 'ConfigurationBuilder' could be found
解决方法：在 project.json 的 dependencies 中添加配置： "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0-*" ，详见
5）
'IConfigurationBuilder' does not contain a definition for 'AddJsonFile' and no extension method 'AddJsonFile' accepting a first argument of type 'IConfigurationBuilder' could be found
解决方法：在 project.json 的 dependencies 中添加配置： "Microsoft.Extensions.Configuration.Json": "1.0.0-*" ，详见
6）
The type or namespace name 'IRuntimeEnvironment' does not exist in the namespace 'Microsoft.Extensions.PlatformAbstractions'
解决方法：在 _Layout.cshtml 中删除 @inject Microsoft.Extensions.PlatformAbstractions.IRuntimeEnvironment env ，添加命名空间 @using Microsoft.Extensions.PlatformAbstractions 与代码 @{ var env = PlatformServices.Default.Runtime; } 。
四、代码改进
在 Program.cs 中将 .UseServer("Microsoft.AspNetCore.Server.Kestrel") 改为 .UseKestrel() 。
五、project.json、Program.cs、Startup.cs中的完整代码
1）project.json
{ "compilationOptions": { "preserveCompilationContext": true, "emitEntryPoint": true }, "dependencies": { "Microsoft.Extensions.Logging.Console": "1.0.0-*", "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0-*", "Microsoft.AspNetCore.HttpOverrides": "1.0.0-*", "Microsoft.AspNetCore.Mvc": "1.0.0-*", "Microsoft.AspNetCore.StaticFiles": "1.0.0-*", "Microsoft.AspNetCore.Diagnostics": "1.0.0-*", "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-*", "Microsoft.EntityFrameworkCore.SqlServer": "1.0.0-*", "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0-*", "Microsoft.Extensions.Configuration.Json": "1.0.0-*", "Microsoft.NETCore.App": { "type": "platform", "version": "1.0.0-*" } }, "frameworks": { "netcoreapp1.0": { "imports": [ "portable-net45+wp80+win8+wpa81+dnxcore50", "portable-net45+win8+wp8+wpa81", "portable-net45+win8+wp8" ] } }, "tools": { "Microsoft.AspNetCore.Server.IISIntegration.Tools":{ "version": "1.0.0-*", "imports": "portable-net45+win8+dnxcore50" } }} 2）Program.cs
using System.IO;using Microsoft.AspNetCore.Hosting;using Microsoft.AspNetCore.Builder;namespace CNBlogs.AboutUs.Web{ public class Program { public static void Main(string[] args) { var host = new WebHostBuilder() .UseKestrel() .UseUrls("http://*:8001") .UseContentRoot(Directory.GetCurrentDirectory()) .UseIISIntegration() .UseStartup () .Build(); host.Run(); } }} 3）Startup.cs
using System;using System.IO;using System.Linq;using Microsoft.AspNetCore.Builder;using Microsoft.Extensions.DependencyInjection;using Microsoft.EntityFrameworkCore;using CNBlogs.AboutUs.Data;using Microsoft.Extensions.PlatformAbstractions;using Microsoft.Extensions.Configuration;using System.Data.SqlClient;using Microsoft.Extensions.Logging;using CNBlogs.AboutUs.Application;using Microsoft.AspNetCore.Hosting;namespace CNBlogs.AboutUs.Web{ public class Startup { public Startup(IHostingEnvironment hostingEnv) { IConfigurationBuilder builder = new ConfigurationBuilder() .SetBasePath(hostingEnv.ContentRootPath) .AddJsonFile("config.json", false); Configuration = builder.Build(); } public IConfiguration Configuration { get; set; } public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory, IHostingEnvironment env) { if(env.IsDevelopment()) { loggerFactory.AddConsole(LogLevel.Debug); } else { loggerFactory.AddConsole(LogLevel.Error); } app.UseDeveloperExceptionPage(); app.UseMvcWithDefaultRoute(); app.UseStaticFiles(); app.UseRuntimeInfoPage(); if(env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } } public void ConfigureServices(IServiceCollection services) { services.AddMvc(); services.AddEntityFrameworkSqlServer() .AddDbContext (options => { options.UseSqlServer(Configuration["data:ConnectionString"]); }); services.AddTransient (); services.AddTransient (); } }} 发表评论
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