如何使用ASP.NET Core自定义Tag Helper中的视图？

我一直关注这篇关于编写自定义Tag Helpers here的微软文章.

我在哪里看到代码,其中元素标记在C#中被硬编码

示例(取自上面的链接)

public override void Process(TagHelperContext context,TagHelperOutput output)
{
     output.TagName = "section";
     output.Content.SetHtmlContent(
        $@"<ul><li><strong>Version:</strong> {Info.Version}</li>
        <li><strong>copyright Year:</strong> {Info.copyrightYear}</li>
        <li><strong>Approved:</strong> {Info.Approved}</li>
        <li><strong>Number of tags to show:</strong> {Info.TagsToShow}</li></ul>");
     output.TagMode = TagMode.StartTagAndEndTag;
}

而不是这样做,有没有办法从cshtml文件加载标记模板？ (类似于加载部分视图)

我的目的是拥有单独的cshtml文件(每个元素类型一个),这样我就可以轻松地设置它们的样式.我的C#看起来也很干净！

谢谢,

詹姆士

解决方法

您可以创建局部视图,并从TagHelper类中调用它.例如：

<!-- Views/Shared/TagHelpers/MyList.cshtml -->
@model YourInfoClass
<ul>
    <li><strong>Version:</strong> @Model.Version</li>
    <li><strong>copyright Year:</strong> @Model.copyrightYear</li>
    <li><strong>Approved:</strong> @Model.Approved</li>
    <li><strong>Number of tags to show:</strong> @Model.TagsToShow</li>
</ul>

在你的TagHelper中：

[HtmlTargetElement("mylist")]
public class MyListTagHelper : TagHelper
{
    private HtmlHelper _htmlHelper;
    private HtmlEncoder _htmlEncoder;

    public MyListTagHelper(IHtmlHelper htmlHelper,HtmlEncoder htmlEncoder)
    {
        _htmlHelper = htmlHelper as HtmlHelper;
        _htmlEncoder = htmlEncoder;
    }

    public override async Task ProcessAsync(TagHelperContext context,TagHelperOutput output)
    {
        output.TagName = "section";
        output.TagMode = TagMode.StartTagAndEndTag;

        var partial = await _htmlHelper.PartialAsync("TagHelpers/MyList",Info);
        var writer = new StringWriter();
        partial.Writeto(writer,_htmlEncoder);

        output.Content.SetHtmlContent(writer.ToString());
    }
}