自闭式TagHelper合并兄弟元素的html标记

Question

我对TagHelper在ASP.NET Core MVC 中引入的行为感到困惑.按照本教程一个有效的电子邮件Tag Helper,我们有机会编写自动关闭标签.根据这篇文章,我们应该使用attbute HtmlTargetElement.下面的类是示例:

 [HtmlTargetElement("email", TagStructure = TagStructure.WithoutEndTag)]
public class EmailTagHelper : TagHelper
{
    private const string EmailDomain = "contoso.com";
    public string MailTo { get; set; }
    public override void Process(TagHelperContext context, TagHelperOutput output)
    {
        output.TagName = "a";
        var address = MailTo + "@" + EmailDomain;
        output.Attributes.SetAttribute("href", "mailto:" + address);
        output.Content.SetContent(address);
    }
}

剃刀视图中的标记如:

<strong>Support:</strong>
    <email mail-to="Support"/><br />
<strong>Marketing:</strong>
    <email mail-to="Marketing"/>

但我有意想不到的输出:

<strong>Support:</strong>
<a href="mailto:Support@contoso.com">
    <span>Another content</span>
    <strong>Marketing:</strong>
</a>
<a href="mailto:Marketing@contoso.com"></a>

为什么第一个锚标记包含<span>和<strong>标记内容？
没有HtmlTargetElement属性和</email>剃刀视图中的结束标记我有正确的行为.

Answer 1

我运行了相同的示例，并且能够产生相同的问题。调试时，我注意到输出的TagMode默认设置为SelfClosing。这对于锚标记无效。然后，将锚的标记模式设置为StartTagAndEndTag，并按预期生成输出。

public override void Process(TagHelperContext context, TagHelperOutput output)
{
    output.TagName = "a";

    // ADD THIS LINE TO YOUR CODE
    output.TagMode = TagMode.StartTagAndEndTag;

    var address = MailTo + "@" + EmailDomain;
    output.Attributes.SetAttribute("href", "mailto:" + address);
    output.Content.SetContent(address);
}

剃刀：

<strong>Support:</strong><email mail-to="Support" /><br />
<strong>Marketing:</strong><email mail-to="Marketing" />

产生此输出：

<strong>Support:</strong><a href="mailto:Support@contoso.com">Support@contoso.com</a><br />
<strong>Marketing:</strong><a href="mailto:Marketing@contoso.com">Marketing@contoso.com</a>