Pass ModelExpression for use in asp-for tag helper in Razor Pages

Question

I have some repeated code I'd like to move to a Razor Pages code block, which contains an asp-for tag helper. That expects a ModelExpression, and I'm unsure how to pass that.

@model IndexModel

@{
  async Task Render<TValue>(Expression<Func<IndexModel, TValue>> expression)
  {
    var viewData = (ViewDataDictionary<IndexModel>)ViewData;
    var modelExpression = ModelExpressionProvider.CreateModelExpression(viewData, expression);
    <label asp-for=@modelExpression></label>
    <input asp-for=@modelExpression />
  }
}

@{await Render(x => x.Foo);}
@{await Render(x => x.Bar);}
@{await Render(x => x.Baz);}

The id, name, value and display name are rendered incorrectly. (e.g. "modelExpression" and "Microsoft.AspNetCore.Mvc.ViewFeatures.ModelExpression").

How do I do this?

(I'm aware of workarounds including IHtmlHelper, but I'd like to get this to work, please.)

Answer 1

This behavior is not supported,yo may see this issue on github;

You could use editor template instead

call

@Html.EditorForModel()

or create your template in "/Pages/Shared/EditorTemplates" folder and call @Html.EditorForModel("yourtemplate")

For more details,you may read this document