找不到类型或名称空间名称"IWebHostEnvironment"(您是否缺少using指令或程序集引用?) [英] The type or namespace name 'IWebHostEnvironment' could not be found (are you missing a using directive or an assembly reference?)

问题描述

我正在使用.NET Core 3.0.100； Microsoft Visual Studio Community 2019预览版16.4.0预览版1.0; Blazor服务器(正式发行版).

I am using .NET Core 3.0.100 ; Microsoft Visual Studio Community 2019 Preview Version 16.4.0 Preview 1.0 ; Blazor-server (official release).

我正在尝试将身份验证和授权添加到我的Blazor服务器Web应用程序.我在这里阅读指南

I am trying to add Authentication and Authorization to my Blazor-server web app. I am reading guideline at here https://docs.microsoft.com/en-us/aspnet/core/security/authentication/scaffold-identity?view=aspnetcore-3.0&tabs=visual-studio#scaffold-identity-into-an-empty-project

(我也阅读了此 https://github.com/aspnet/Identity/issues/1825 )

然后我右键单击Project，选择Add \ New Scaffolded Item...

Then I right-click on Project, choose Add \ New Scaffolded Item...

我阅读了文件ScaffoldingReadme.txt，然后按照指南进行操作.

I read file ScaffoldingReadme.txt, then follow the guide.

我按F5进行调试，发现错误

I press F5 for debugging, I catch error

Severity:       Error
Error Code:     CS0246
Description:    The type or namespace name 'IWebHostEnvironment' could not be found (are you missing a using directive or an assembly reference?)
Project:        foo
File:       C:\Users\donhuvy\Desktop\foo\bar\obj\Debug\netcoreapp3.0\Razor\Pages\Shared\_Layout.cshtml.g.cs
Line:       455
Suppression State:  Active

屏幕截图 [！[在此处输入图片描述] [4]] [4]

Screenshot [![enter image description here][4]][4]

因为文件\obj\Debug\netcoreapp3.0\Razor\Pages\Shared\_Layout.cshtml.g.cs位于Razor类库Microsoft.AspNetCore.Identity.UI (3.0.0)中，所以我无法对其进行编辑.

Because file \obj\Debug\netcoreapp3.0\Razor\Pages\Shared\_Layout.cshtml.g.cs stand inside Razor Class Library Microsoft.AspNetCore.Identity.UI (3.0.0) therefore I cannot edit it.

如何解决?

推荐答案

这是个问题，

生成的代码是

Microsoft.AspNetCore.Hosting
@using Microsoft.AspNetCore.Mvc.ViewEngines
@inject IWebHostEnvironment Environment
@inject ICompositeViewEngine Engine

它丢失了@using

应该是

@using Microsoft.AspNetCore.Hosting

我在 https://github.com/aspnet/Scaffolding/issues/1094

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