support for dynamic keyword

[kai-oswald]

I recently tried using blazor with the dynamic keyword. The compilation is succesful, but the page stays empty. Is support for dynamic planned or am I missing something and there is a workaround to use dynamic?

[SteveSandersonMS]

It did work ok when I tried it. Could you post a code sample that reproduces the issue? Thanks!

[kai-oswald]

The following steps will reproduce the issue:

• Create new Blazor Project
• Add Microsoft.CSharp Nuget
• Add Razor View:

@page "/dynamic"

<h2>@test</h2>

@functions {
    dynamic test = "this won't show";
}

[Suchiman]

@kai-oswald it does work, but it seems you missed the compiler error
obj\Debug\netstandard2.0\Pages\Index.g.cs(36,13,36,20): error CS0656: Missing compiler required member 'Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create'

Just add these to the blazor csproj to fix it:

    <PackageReference Include="System.Dynamic.Runtime" Version="4.3.0" />
    <PackageReference Include="Microsoft.CSharp" Version="4.4.1" />

EDIT: But it seems i'm unable to read. You did add the Nuget... i needed to add both to make the compiler error go away, but after that, this just worked fine.

[SteveSandersonMS]

After adding the two package (System.Dynamic.Runtime and Microsoft.CSharp), the code works fine with linking disabled (<BlazorLinkOnBuild>false</BlazorLinkOnBuild> in the csproj), but fails to compile if linking is enabled. The error is:

Cannot find declaration of exported type 'System.Threading.Semaphore' from the assembly 'System.Threading, Version=4.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Cannot find declaration of exported type 'System.Reflection.Emit.DynamicMethod' from the assembly 'System.Reflection.Emit.Lightweight, Version=4.0.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'

Therefore I'll close this as a duplicate of aspnet/Blazor#365.

[danroth27]

@SteveSandersonMS Did you link to the correct bug? How is this related to the Windows Defender issue?