How to pass a Guid to a property on a Tag Helper in ASP.NET Core

Question

I have a custom TagHelper I need to pass a Guid to, but I get errors when I pass the value. How can I pass in a Guid?

TagHelper:

[HtmlTargetElement("assets:signin", Attributes = "profile", TagStructure = TagStructure.NormalOrSelfClosing)]
public sealed class GoToSignInTagHelper(IWebHostEnvironment environment, IHtmlHelper html, ITagHelperRepo helperRepo, IUtilityHelper helpUtil) : TagHelperCustom(environment, helperRepo, html)
{
    public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
    {
        await base.PreProcessAsync(context, output);

        ITagBuilderCustom link = new TagBuilderCustom("a");
        link.AddAttribute("href", $"{CoreStatics.AssetsURL}/SignIn?uid={this.Profile}");

        AddContent(link);

        await base.ProcessAsync();
    }

    [HtmlAttributeName("profile")]
    public Guid Profile { get; set; }
}

Cshtml:

<assets:signin profile="5073c3f0-c4ac-4be8-ae7f-9b23ae5e640e" />

The errors I get when I build the project:

Answer 1

Reproduce from my end, you cannot directly provide the Guid (string) to the profile attribute as your current way which results in the compilation error.

Provide the Guid value as:

<assets:signin profile='@Guid.Parse("5073c3f0-c4ac-4be8-ae7f-9b23ae5e640e")' />

or

@{
    Guid guid = Guid.Parse("5073c3f0-c4ac-4be8-ae7f-9b23ae5e640e");
}

<assets:signin profile="@guid" />

Another approach is that the profile attribute to accept the string value, then you should have another property/variable to convert the string into Guid.

[HtmlTargetElement("assets:signin", Attributes = "profile", TagStructure = TagStructure.NormalOrSelfClosing)]
public sealed class GoToSignInTagHelper(IWebHostEnvironment environment, IHtmlHelper html, ITagHelperRepo helperRepo, IUtilityHelper helpUtil) : TagHelperCustom(environment, helperRepo, html)
{
    [HtmlAttributeName("profile")]
    public string ProfileString { get; set; }

    public Guid Profile
    {
        get { return Guid.Parse(ProfileString); }
    }

    ...
}

So you can provide the value as below:

<assets:signin profile="5073c3f0-c4ac-4be8-ae7f-9b23ae5e640e" />