Consecutive @(...) not allowed inside html attribute

[Bouke]

Is there an existing issue for this?

• I have searched the existing issues

I tried searching for this error, but I'm unaware of the name of this language construct. Searching with just the symbols didn't yield any results for me.

Describe the bug

I'm building a dynamic url in a Blazor component and was debugging compilation failures. Simplified, the bug reproduces on this example:

<a href="@("")@("")"></a>

Expected Behavior

I would expect this to work, as these variants are also supported:

<a href="@("") @("")"></a>
<a href="@("")"></a>
<a>@("")@("")</a>

Steps To Reproduce

• Apply the Blazor template
• Replace Home.razor with:

@page "/"

<a href="@("")"></a>

Exceptions (if any)

0>Home.razor(3,14): Error CS1003 : Syntax error, ',' expected
0>Components_Pages_Home_razor.g.cs(92,23): Error CS1501 : No overload for method 'AddAttribute' takes 4 arguments

.NET Version

9.0.100 and 10.0.100-preview.3.25201.16

Anything else?

[davidwengier]

As per #9985 (comment) I believe this behaviour is by design in the compiler.

[chsienki]

Yes, unfortunately this behavior is currently 'by design' in that it would be a breaking change to fix it. We have considered options for how to move forward with these kinds of changes though, so will leave this open to track it.