Passingwind

asp.net core 页面 TagHelper  的 Id 和 Name 属性扩展 。

    [HtmlTargetElement(Attributes = "asp-name")]
    public class NameTagHelper : TagHelper
    {
        private const string NameAttributeName = "asp-name";

        [HtmlAttributeName(NameAttributeName)]
        public ModelExpression Name { get; set; }

        [ViewContext, HtmlAttributeNotBound]
        public ViewContext ViewContext { get; set; }

        private IHtmlGenerator _generator;

        public NameTagHelper(IHtmlGenerator generator)
        {
            this._generator = generator;

        }

        public override void Process(TagHelperContext context, TagHelperOutput output)
        {
            if (context == null)
            {
                throw new ArgumentNullException(nameof(context));
            }
            if (output == null)
            {
                throw new ArgumentNullException(nameof(output));
            }

            if (this.Name != null)
            {
                if (this.Name.Metadata == null)
                {
                    throw new ArgumentException(nameof(Name));
                }

                string value = NameAndIdProvider.GetFullHtmlFieldName(ViewContext, this.Name.Name);

                output.Attributes.SetAttribute("name", value);
            }
        }
    }

    [HtmlTargetElement(Attributes = "asp-id")]
    public class IdTagHelper : TagHelper
    {
        private const string IdAttributeName = "asp-id";

        [HtmlAttributeName(IdAttributeName)]
        public ModelExpression Id { get; set; }

        [ViewContext, HtmlAttributeNotBound]
        public ViewContext ViewContext { get; set; }

        private IHtmlGenerator _generator;

        public IdTagHelper(IHtmlGenerator generator)
        {
            this._generator = generator;

        }

        public override void Process(TagHelperContext context, TagHelperOutput output)
        {
            if (context == null)
            {
                throw new ArgumentNullException(nameof(context));
            }
            if (output == null)
            {
                throw new ArgumentNullException(nameof(output));
            }

            if (this.Id != null)
            {
                if (this.Id.Metadata == null)
                {
                    throw new ArgumentException(nameof(Id));
                }

                string idFieldName = NameAndIdProvider.GetFullHtmlFieldName(ViewContext, this.Id.Name);
                string idFieldValue = NameAndIdProvider.CreateSanitizedId(this.ViewContext, idFieldName, _generator.IdAttributeDotReplacement);

                output.Attributes.SetAttribute("id", idFieldValue);
            }
        }
    }