asp.net-mvc 如何在 cshtml 模板中创建函数？
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How to create a function in a cshtml template?
提问by Saeed Neamati
I need to create a function that is only necessary inside one cshtml file. You can think of my situation as ASP.NET page methods, which are min web services implemented in a page, because they're scoped to one page. I know about HTML helpers (extension methods), but my function is just needed in one cshtml file. I don't know how to create a function signature inside a view. Note: I'm using Razor template engine.
我需要创建一个仅在一个 cshtml 文件中才需要的函数。您可以将我的情况视为 ASP.NET 页面方法，它们是在页面中实现的最小 Web 服务，因为它们的范围仅限于一个页面。我知道 HTML 帮助程序（扩展方法），但我的函数只需要在一个 cshtml 文件中。我不知道如何在视图中创建函数签名。 注意：我正在使用 Razor 模板引擎。
回答by
why not just declare that function inside the cshtml file?
为什么不在 cshtml 文件中声明该函数？
@functions{
public string GetSomeString(){
return string.Empty;
}
}
<h2>index</h2>
@GetSomeString()
回答by Daniel Liuzzi
You can use the @helper Razor directive:
您可以使用@helper Razor 指令：
@helper WelcomeMessage(string username)
{
<p>Welcome, @username.</p>
}
Then you invoke it like this:
然后你像这样调用它：
@WelcomeMessage("John Smith")
回答by Muhammad Hasan Khan
If your method doesn't have to return html and has to do something else then you can use a lambda instead of helper method in Razor
如果您的方法不必返回 html 并且必须执行其他操作，那么您可以在 Razor 中使用 lambda 而不是辅助方法
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
Func<int,int,int> Sum = (a, b) => a + b;
}
<h2>Index</h2>
@Sum(3,4)
回答by archil
Take a look at Declarative Razor Helpers
看看声明式剃刀助手
回答by Alexandre Daubricourt
If you want to access your page's global variables, you can do so:
如果要访问页面的全局变量，可以这样做：
@{
ViewData["Title"] = "Home Page";
var LoadingButtons = Model.ToDictionary(person => person, person => false);
string GetLoadingState (string person) => LoadingButtons[person] ? "is-loading" : string.Empty;
}
