[wasm] Cannot get location for a loaded assembly (`Assembly.Location`)

[ddobric]

Hi all,

trying to evaluate the CSharp expression, that fails when adding reference. Following code fails at the first line:

var options = ScriptOptions.Default.AddReferences(typeof(TItem).Assembly);

Func<TItem, bool> discountFilterExpression = await CSharpScript.EvaluateAsync<Func<TItem, bool>>(this.Expression, options);

The error:

"Can't create a metadata reference to an assembly without location"

The same code works in a .NET 5 application. It fails when started in the Blazor web assembly standalone.

Project settings

<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
    <RuntimeIdentifier>browser-wasm</RuntimeIdentifier>
    <UseBlazorWebAssembly>true</UseBlazorWebAssembly>
    <!--<RazorLangVersion>3.0</RazorLangVersion>-->
  </PropertyGroup>

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Issue Details

---

Hi all, trying to evaluate the CSharp expression, that fails when adding reference. Following code fails at the first line: ``` var options = ScriptOptions.Default.AddReferences(typeof(TItem).Assembly); Func discountFilterExpression = await CSharpScript.EvaluateAsync>(this.Expression, options); ``` The error: `"Can't create a metadata reference to an assembly without location" ` The same code works in a .NET 5 application. It fails when started in the Blazor web assembly standalone. ### Project settings ``` net5.0 browser-wasm true ```

Author:	ddobric
Assignees:	-
Labels:	`area-VM-meta-mono`, `untriaged`
Milestone:	-

[ghost]

Tagging subscribers to 'arch-wasm': @lewing See info in area-owners.md if you want to be subscribed.

Issue Details

---

Hi all, trying to evaluate the CSharp expression, that fails when adding reference. Following code fails at the first line: ``` var options = ScriptOptions.Default.AddReferences(typeof(TItem).Assembly); Func discountFilterExpression = await CSharpScript.EvaluateAsync>(this.Expression, options); ``` The error: `"Can't create a metadata reference to an assembly without location" ` The same code works in a .NET 5 application. It fails when started in the Blazor web assembly standalone. ### Project settings ``` net5.0 browser-wasm true ```

Author:	ddobric
Assignees:	-
Labels:	`arch-wasm`, `area-VM-meta-mono`, `untriaged`
Milestone:	-

[lewing]

The assemblies you load at startup in the webassembly runtime don't have a location so you are hitting https://github.com/dotnet/roslyn/blob/315c2e149ba7889b0937d872274c33fcbfe9af5f/src/Compilers/Core/Portable/MetadataReference/MetadataReference.cs#L333

[lewing]

Like with SingleFile applications Assembly.Location is expected to be empty in this case so this is the expected behavior.