在 ASP.NET Core 中替换 @helper

本文介绍了在 ASP.NET Core 中替换 @helper的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

到目前为止，我认为 ViewComponent 并没有解决 TagHelper 的问题.有什么替代品吗?接受参数并返回 HtmlString 的东西?

So far, i don't think ViewComponent solves that neither does TagHelper. Is there any replacement to this? Something that takes parameters and returns a HtmlString?

我没有看到任何有害的:

I don't see anything harmful with:

@helper foo(string something) { <div>Say @something</div> } var emailbody = classfilenameinAppCodefolder.foo("hello"); //store result in a variable for further processes

现在我相信它是在 RC 之前的临时删除.github/aspnet/Razor/issues/281 和 github/aspnet/Mvc/issues/1130 好吧！最好是.我希望有人在努力.如果没有 @helper，构建大型 HtmlString 或模板"将非常痛苦.

For now i believe its a temporary delete before RC. github/aspnet/Razor/issues/281 and github/aspnet/Mvc/issues/1130 Well! it better be. I hope someone is working on it. Without @helper, building large HtmlString or 'template' would be a serious pain.

注意:局部视图似乎无法解决问题.我认为它只呈现视图而不是将视图返回到变量.

Note: Partial View doesn't seem to do the trick. I think it only renders views not return view to variable.

其次，App_Code 文件夹怎么了?

Secondly, what happened to the App_Code folder?

推荐答案

根据下面的 Github issue，看来@helper 又回来了，将被包含在 asp core 3.0.0 preview 4 中.

According to the following Github issue, it looks like @helper is coming back and will be included in asp core 3.0.0 preview 4.

github/aspnet/AspNetCore/issues/5110

更新

从 asp core 3 开始，您现在可以在 Razor 代码块中定义本地函数.

Starting in asp core 3, you can now define a local function within a Razor code block.

@{ void RenderName(string name) { <p>Name: <strong>@name</strong></p> } RenderName("Mahatma Gandhi"); RenderName("Martin Luther King, Jr."); }

docs.microsoft/en-us/aspnet/core/mvc/views/razor?view=aspnetcore-3.1#razor-code-blocks

您也可以像这样使用@functions 指令:

Alternatively you can use the @functions directive like this:

@{ RenderName("Mahatma Gandhi"); RenderName("Martin Luther King, Jr."); } @functions { private void RenderName(string name) { <p>Name: <strong>@name</strong></p> } }

docs.microsoft/en-us/aspnet/core/mvc/views/razor?view=aspnetcore-3.1#functions