I was not able to scaffold Razor pages due to the incompatibility of various Entity framework versions, So I install all version 5.0.x and the .csproj file was updated. But as I Built the solution It changes back to previous versions.
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp3.1</TargetFramework>
</PropertyGroup>
<ItemGroup>
<Content Remove="Views\Logsign\signup.cshtml" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="5.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="5.0.7" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.15" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.1.15">
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
</PackageReference>
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.5" />
</ItemGroup>
</Project>
Did you change the TargetFramework to 5.0?
<PropertyGroup>
<TargetFramework>netcoreapp5.0</TargetFramework>
</PropertyGroup>