问题描述

我最近遇到了一种情况，我想在标签助手中使用标签助手.我环顾四周，找不到其他人尝试这样做，是我使用了糟糕的约定还是缺少文档?

I recently ran into a situation where I would like to use a tag helper within a tag helper. I looked around and couldn't find anyone else trying to do this, am I using a poor convention or am I missing documentation?

例如.标签助手 A 输出包含另一个标签助手的 HTML.

Ex. Tag Helper A outputs HTML that contains another tag helper.

例如.

[HtmlTargetElement("tag-name")]
public class RazorTagHelper : TagHelper
{
    public override void Process(TagHelperContext context, TagHelperOutput output)
    {
        StringBuilder sb = new StringBuilder();
        sb.Append("<a asp-action="Home" ");
        output.Content.SetHtmlContent(sb.ToString());
    }
}

有没有办法让我处理 <a asp-action></a> 来自 C# 的标签助手?还是用标签助手重新处理输出的 HTML?

Is there a way for me to process the <a asp-action> </a> tag helper from C#? Or to reprocess the output HTML with tag helpers?

推荐答案

不，你不能.TagHelpers 是 Razor 解析时间功能.

No you cannot. TagHelpers are a Razor parse time feature.

另一种方法是创建 TagHelper 并手动调用其 ProcessAsync/Process 方法.又名:

One alternative is creating a TagHelper and manually invoking its ProcessAsync/Process method. Aka:

var anchorTagHelper = new AnchorTagHelper
{
    Action = "Home",
};
var anchorOutput = new TagHelperOutput("a", new TagHelperAttributeList(), (useCachedResult, encoder) => new HtmlString());
var anchorContext = new TagHelperContext(
    new TagHelperAttributeList(new[] { new TagHelperAttribute("asp-action", new HtmlString("Home")) }),
    new Dictionary<object, object>(),
    Guid.NewGuid());
await anchorTagHelper.ProcessAsync(anchorContext, anchorOutput);
output.Content.SetHtmlContent(anchorOutput);

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