是否可以将ModelExpression传递给TagHelper？ [英] Is it possible to pass ModelExpression to a TagHelper?

问题描述

使用TagHelper中的此属性，我们可以获得 ModelExpression ：

We can get a ModelExpression using this property in a TagHelper:

[HtmlAttributeName("asp-for")]
public ModelExpression For { get; set; }

我设法以某种方式使ViewModel拥有一个 ModelExpression 属性：

I somehow managed* to have a ViewModel wich has a ModelExpression property:

public class TemplateViewModel
{
    public ModelExpression For { get; set; }
}

每次我尝试传递它时，模型表达式都是<$ c $来自 TemplateViewModel 的c> For ，不是真正的Expression wich存储在 For 中：

Everytime I try to pass it, the Model expression is For from TemplateViewModel, not the real Expression wich is stored into For:

@model TemplateViewModel
<input asp-for="@Model.For" class="form-control"/>

以上结果：

<input class="form-control" type="text" id="For" name="For" value="Microsoft.AspNetCore.Mvc.ViewFeatures.ModelExpression" />

我期望输入，由 ModelExpression 代替 ModelExpression 的 ModelExpression 。

I expected, the input, which is described by the ModelExpression instead of literaly a ModelExpression for the ModelExpression.

_{*因为我想使用 IHtmlHelper :: PartialView（）获得TagHelper的模板视图。此示例已大大减少。我的主要动机是为单个< form-group for = /> TagHelper，它生成一个引导表单组。}

_{*since I want to have a Template View for an TagHelper using IHtmlHelper::PartialView(). This example is heavy minimized. My main motiviation is to create a single <form-group for="" /> TagHelper, which is generating a Bootstrap Form Group.}

推荐答案

ModelExpression 在 Razor编译器，因此无法直接使用。由于编译器是开源的，因此您可以建议使用一个补丁来忽略属性本身为 ModelExpression 的情况。同时，您将需要在代码帮助器中使用其他类型的属性，以帮助您引用实际的 ModelExpression 。也许 public Func< ModelExpression> ForAccessor {获取；组; } ？

ModelExpression is handled as a special case in the Razor Compiler, so this isn't going to work directly. Since the compiler is open source, you could suggest a patch to ignore cases where the property is itself a ModelExpression. In the mean time, you're going to need to use a different type of property in your tag helper, to help you get a reference to the actual ModelExpression. Perhaps public Func<ModelExpression> ForAccessor { get; set; }?

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