Right-click a .razor file in Solution Explorer → Extract Blazor Code-Behind, and the
extension moves your component's @code into a partial-class code-behind file
(Component.razor.cs) — the "extract to code-behind" convenience that Visual Studio 2026 no
longer ships out of the box.
What it does
Finds the first @code { … } (or @functions { … }) block.
Splits it into individual members and moves every plain-C# member into
Component.razor.cs — a public partial class with a file-scoped namespace computed the way
Blazor names components (root namespace + folder path).
Carries over the component's @using directives.
Updates the .razor in the live editor buffer (no "file changed externally" prompt).
Only appears on .razor files.
Inline Razor markup is handled gracefully
Some @code members contain inline render templates, e.g.:
That @<…> markup transition is Razor syntax and is not valid C#, so it cannot live in a
.cs file. Rather than fail, the extension does a partial extraction: plain-C# members move
to the code-behind, and any member containing @<…> stays in a small residual @code block in
the .razor. It then tells you which members were kept behind.
Requirements
Visual Studio 2022 (17.14+) or Visual Studio 2026.
