我是 Blazor 的新手，我有 Visual Studio 2019 16.4.5。我已经安装了 .Net Core 3.1 SDK。我正在尝试安装Blazor 模板。我正在寻找 Blazor Server 应用程序 Blazor WebAssembly 应用程序。我尝试通过包管理器以及命令提示符安装模板（Microsoft.AspNetCore.Blazor.Template），但它似乎不起作用，因为我得到了帮助信息。当我创建一个新项目时，我只看到Blazor App选项。
如果选择它，则没有“下一步”按钮，而只有“创建”。
PM> dotnet new -i Microsoft.AspNetCore.Blazor.Templates::3.2.0-preview1.20073.1
Restore completed in 497.79 ms for C:\Users\C113850\.templateengine\dotnetcli\v3.1.101\scratch\restore.csproj.
Usage: new [options]
Options:
-h, --help Displays help for this command.
-l, --list Lists templates containing the specified name. If no name is specified, lists all templates.
-n, --name The name for the output being created. If no name is specified, the name of the current directory is used.
-o, --output Location to place the generated output.
-i, --install Installs a source or a template pack.
-u, --uninstall Uninstalls a source or a template pack.
--nuget-source Specifies a NuGet source to use during install.
--type Filters templates based on available types. Predefined values are "project", "item" or "other".
--dry-run Displays a summary of what would happen if the given command line were run if it would result in a template creation.
--force Forces content to be generated even if it would change existing files.
-lang, --language Filters templates based on language and specifies the language of the template to create.
--update-check Check the currently installed template packs for updates.
--update-apply Check the currently installed template packs for update, and install the updates.
Templates Short Name Language Tags
----------------------------------------------------------------------------------------------------------------------------------
Console Application console [C#], F#, VB Common/Console
Class library classlib [C#], F#, VB Common/Library
WPF Application wpf [C#] Common/WPF
WPF Class library wpflib [C#] Common/WPF
WPF Custom Control Library wpfcustomcontrollib [C#] Common/WPF
WPF User Control Library wpfusercontrollib [C#] Common/WPF
Windows Forms (WinForms) Application winforms [C#] Common/WinForms
Windows Forms (WinForms) Class library winformslib [C#] Common/WinForms
Worker Service worker [C#] Common/Worker/Web
Unit Test Project mstest [C#], F#, VB Test/MSTest
NUnit 3 Test Project nunit [C#], F#, VB Test/NUnit
NUnit 3 Test Item nunit-test [C#], F#, VB Test/NUnit
xUnit Test Project xunit [C#], F#, VB Test/xUnit
Razor Component razorcomponent [C#] Web/ASP.NET
Razor Page page [C#] Web/ASP.NET
MVC ViewImports viewimports [C#] Web/ASP.NET
MVC ViewStart viewstart [C#] Web/ASP.NET
Blazor Server App blazorserver [C#] Web/Blazor
Blazor WebAssembly App blazorwasm [C#] Web/Blazor/WebAssembly
ASP.NET Core Empty web [C#], F# Web/Empty
ASP.NET Core Web App (Model-View-Controller) mvc [C#], F# Web/MVC
ASP.NET Core Web App webapp [C#] Web/MVC/Razor Pages
ASP.NET Core with Angular angular [C#] Web/MVC/SPA
ASP.NET Core with React.js react [C#] Web/MVC/SPA
ASP.NET Core with React.js and Redux reactredux [C#] Web/MVC/SPA
Razor Class Library razorclasslib [C#] Web/Razor/Library/Razor Class Library
ASP.NET Core Web API webapi [C#], F# Web/WebAPI
ASP.NET Core gRPC Service grpc [C#] Web/gRPC
dotnet gitignore file gitignore Config
global.json file globaljson Config
NuGet Config nugetconfig Config
Dotnet local tool manifest file tool-manifest Config
Web Config webconfig Config
Solution File sln Solution
Protocol Buffer File proto Web/gRPC
Examples:
dotnet new mvc --auth Individual
dotnet new xunit
dotnet new --help
PM> dotnet --list-sdks
2.1.402 [C:\Program Files\dotnet\sdk]
2.1.403 [C:\Program Files\dotnet\sdk]
2.1.500 [C:\Program Files\dotnet\sdk]
2.1.502 [C:\Program Files\dotnet\sdk]
2.1.503 [C:\Program Files\dotnet\sdk]
2.1.504 [C:\Program Files\dotnet\sdk]
2.1.505 [C:\Program Files\dotnet\sdk]
2.1.507 [C:\Program Files\dotnet\sdk]
2.1.508 [C:\Program Files\dotnet\sdk]
2.1.509 [C:\Program Files\dotnet\sdk]
2.1.511 [C:\Program Files\dotnet\sdk]
2.2.104 [C:\Program Files\dotnet\sdk]
3.0.102 [C:\Program Files\dotnet\sdk]
3.1.101 [C:\Program Files\dotnet\sdk]
3.1.102 [C:\Program Files\dotnet\sdk]
感谢您的帮助！