Blazor WebAssembly does not load Razor Class Library DLL in the browser

[shengjing2019]

I'm creating a Blazor WebAssembly app, and I have a Razor Class Library that has some components. The webapp project has a dependency on the Razor Class Library, but when I run the app the Razor Class Lib dll is not loaded to the browser.

Here is the .csproj file of my Razor Class Lib

<Project Sdk="Microsoft.NET.Sdk.Razor">
   <PropertyGroup>
     <TargetFramework>netstandard2.1</TargetFramework>
     <RazorLangVersion>3.0</RazorLangVersion>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="3.1.7" />
   </ItemGroup>
</Project>

Could someone point out why the Razor Class Lib is not loaded in the browser?