最近在部署.net core 3.1的项目到iis，遇到了一些问题，找了很多资料，然后通过一一实践，也就 顺利完成了部署。也因此总结记录下来，希望可以帮助到更多的人。

　　感谢文献参考：Windows平台部署 Asp.Net Core 3.1.0,将 ASP.NET Core 应用发布到 IIS ,使用 IIS 在 Windows 上托管 ASP.NET Core

　　1.首先安装SDK（我安装的是：dotnet-sdk-3.1.100-win-x64.exe）地址：https://dotnet.microsoft.com/download

　　2.安装.NET Core Hosting Bundle(我安装的版本是：dotnet-hosting-3.1.2-win.exe) 地址：https://dotnet.microsoft.com/download/dotnet-core/3.1

　　3.部署iis，绑定IP端口号，修改应用程序池托管方式

　　4.运行程序发生错误

　　a . HTTP Error 500.30 - ANCM In-Process Start Failure

　　b. System.InvalidOperationException: Application is running inside IIS process but is not configured to use IIS server.

　　c. Application '/LM/W3SVC/11/ROOT' with physical root 'D:\测试\XXXXXX-01\' hit unexpected managed exception, exception code = '0xe0434352'. First 30KB characters of captured stdout and stderr logs

　　d.  System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead.

　　5.解决方式

　　　4-a. HTTP Error 500.30 - ANCM In-Process Start Failure

　　　　解决方式：

　　　　　　　　①.停止iis  ，打开：C:\Windows\System32\inetsrv\config\applicationHost.config ，搜索节点AspNetCoreModuleV2 

　　　　　　　   ②.修改节点指定加载模式  preCondition="bitness64"

<add name="AspNetCoreModuleV2" image="%ProgramFiles%\IIS\Asp.Net Core Module\V2\aspnetcorev2.dll" preCondition="bitness64" />

<add name="AspNetCoreModuleV2" preCondition="bitness64" />

　　　4- b. System.InvalidOperationException: Application is running inside IIS process but is not configured to use IIS server.

　　    4- c.  Application '/LM/W3SVC/11/ROOT' with physical root 'D:\测试\XXXXXX-01\' hit unexpected managed exception, exception code = '0xe0434352'. First 30KB characters of captured stdout and stderr logs:

　　　　解决方式：在program.cs中删除：webBuilder.UseKestrel();

 public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                    //webBuilder.UseKestrel(）;
                })


    }

　　4-d .System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead.

　　解决方式：在startup.cs 中的ConfigureServices方法加入以下代码

public void ConfigureServices(IServiceCollection services)
{
    // If using Kestrel:
    services.Configure<KestrelServerOptions>(options =>
    {
        options.AllowSynchronousIO = true;
    });

    // If using IIS:
    services.Configure<IISServerOptions>(options =>
    {
        options.AllowSynchronousIO = true;
    });
}