WalkingTec.Mvvm/WalkingTec.Mvvm.TagHelpers.LayUI/ImageTagHelper.cs

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using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;
using WalkingTec.Mvvm.Core;
using WalkingTec.Mvvm.Core.Extensions;

namespace WalkingTec.Mvvm.TagHelpers.LayUI
{
    [HtmlTargetElement("wt:image", Attributes = REQUIRED_ATTR_NAME, TagStructure = TagStructure.WithoutEndTag)]
    public class ImageTagHelper : BaseFieldTag
    {

        public string Url { get; set; }

        public override void Process(TagHelperContext context, TagHelperOutput output)
        {
            if(HideLabel == null)
            {
                HideLabel = true;
            }
            BaseVM vm = null;
            if (context.Items.TryGetValue("model", out object baseVM))
            {
                vm = baseVM as BaseVM;
            }
            else
            {
                //TODO 若 image 组件未在form中该如何解决 _DONOT_USE_CS 的问题？
            }
            if (string.IsNullOrEmpty(Url) && Field.Model != null)
            {
                Url = $"/_Framework/GetFile/{Field.Model}";
                if (vm != null)
                {
                    Url = Url.AppendQuery($"_DONOT_USE_CS={vm.CurrentCS}");
                }
            }
            output.TagName = "img";
            output.TagMode = TagMode.SelfClosing;
            output.Attributes.Add("name", Field.Name + "img");
            output.Attributes.Add("id", Id + "img");
            if (!string.IsNullOrEmpty(Url))
                output.Attributes.Add("src", Url);
            base.Process(context, output);
        }

    }
}