当前上下文中不存在名称 WebHost [英] The name WebHost does not exists in current context

问题描述

借助 docs.microsoft 上的以下帖子，我正在从 ASP.NET Core 1.x 迁移到 v2.0:https://docs.microsoft.com/en-us/aspnet/core/migration/1x-to-2x/

I'm migrating from ASP.NET Core 1.x to v2.0 with the help of following post on docs.microsoft: https://docs.microsoft.com/en-us/aspnet/core/migration/1x-to-2x/

我几乎完成了该帖子中提到的所有更改.但是有一个错误导致了麻烦.

I'm almost done with all the changes mentioned in that post. But there is one error that is causing troubles.

这是我的 Program.cs 文件:

Here is my Program.cs file:

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

namespace MeridiaCoreAPI
{
    public class Program
    {
        public static void Main(string[] args)
        {
            BuildWebHost(args).Run();
        }

        public static IWebHost BuildWebHost(string[] args) =>
           WebHost.CreateDefaultBuilder(args)
               .UseStartup<Startup>()
            .ConfigureAppConfiguration((hostContext, config) =>
            {
            // delete all default configuration providers
            config.Sources.Clear();
                config.AddJsonFile("myconfig.json", optional: true);
            })
               .Build();
    }
}

这里是错误信息:

Suppression State
Error   CS0103  The name 'WebHost' does not exist in the current context

任何解决方案、变通方法或提示将不胜感激.谢谢.

Any solution, workaround or hint would be highly appreciated. Thanks.

推荐答案

WebHost 类位于 Microsoft.AspNetCore.All<附带的 Microsoft.AspNetCore 程序集/code> NuGet 包.因此，要解决您的问题，请安装此 NuGet 包并将以下 using 指令添加到您的源文件中:

WebHost class resides Microsoft.AspNetCore assembly that comes with Microsoft.AspNetCore.All NuGet package. So to fix you problem install this NuGet package and add following using directive to your source file:

使用 Microsoft.AspNetCore;

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