是否有可能创建一个剃刀一般@helper方法? [英] Is it possible to create a generic @helper method with Razor?
问题描述
我试图写一个剃刀帮手,看起来像以下内容:
I am trying to write a helper in Razor that looks like the following:
@helper DoSomething<T, U>(Expression<Func<T, U>> expr) where T : class
不幸的是,解析器认为&LT;吨
是一个HTML元素的开始,我结束了一个语法错误。是否有可能创建一个剃刀助手是一个通用的方法是什么?如果是这样,什么是语法?
Unfortunately, the parser thinks that <T
is the beginning of an HTML element and I end up with a syntax error. Is it possible to create a helper with Razor that is a generic method? If so, what is the syntax?
推荐答案
没有,这是不可能的。你可以写一个普通的HTML帮助吧。
No, this is not possible. You could write a normal HTML helper instead.
public static MvcHtmlString DoSomething<T, U>(
this HtmlHelper htmlHelper,
Expression<Func<T, U>> expr
) where T : class
{
...
}
和则:
@(Html.DoSomething<SomeModel, string>(x => x.SomeProperty))
如果你的目标模型作为第一个通用的参数:
or if you are targeting the model as first generic argument:
public static MvcHtmlString DoSomething<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expr
) where T : class
{
...
}
这将允许您调用像这样(假设,当然,你的看法是强类型的,但是这是一个安全的假设,因为所有的意见应大力反正类型: - )):
which will allow you to invoke it like this (assuming of course that your view is strongly typed, but that's a safe assumption because all views should be strongly typed anyways :-)):
@Html.DoSomething(x => x.SomeProperty)
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