The type or namespace name 'ApplicationPartAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Mvc.ApplicationParts'

[BrunoBlanes]

Describe the bug

ERROR CS0234: The type or namespace name 'ApplicationPartAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Mvc.ApplicationParts' (are you missing an assembly reference?)

The above error is being thrown on the Blazor client project when a reference to Microsoft.AspNetCore.Mvc.DataAnnotations.dll exists on the shared project.

To Reproduce

1. Create a Blazor Web Assembly project
2. On the shared project, add a depedency on the latest Microsoft.AspNetCore.Mvc.DataAnnotations.dll
3. Create a POCO with a property that has the[HiddenInput]attribute in the shared project
4. Build the project

Further technical details

• Output of dotnet --info:

.NET SDK (reflecting any global.json):
 Version:   5.0.100-rc.2.20479.15
 Commit:    da7dfa8840

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.20221
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.100-rc.2.20479.15\

Host (useful for support):
  Version: 5.0.0-rc.2.20475.5
  Commit:  c5a3f49c88

.NET SDKs installed:
  5.0.100-rc.2.20479.15 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 5.0.0-rc.2.20475.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 5.0.0-rc.2.20475.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 5.0.0-rc.2.20475.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

• The IDE: Microsoft Visual Studio Community 2019 Preview Version 16.8.0 Preview 6.0

[BrunoBlanes]

Some additional info:

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//     Runtime Version:4.0.30319.42000
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

using System;
using System.Reflection;

[assembly: Microsoft.AspNetCore.Mvc.ApplicationParts.ApplicationPartAttribute("CRM.Core")]

// Generated by the MSBuild WriteCodeFragment class.

[mkArtakMSFT]

Thanks for contacting us. This is not a pattern we recommend to follow.
You can't reference MVC binaries from a Blazor WebAssembly application.