扩展方法和剃刀页面 [英] Extension Method and Razor Page

问题描述

我已经在app_code中定义了一个扩展方法，如下所示.

I have defined an extension method in app_code like below.

public static class Extensions
{
    public static string Hi(this object obj)
    {
        return "hi";
    }
}

在剃须刀页面上，任何东西都可以打个招呼:)

In the razor page, anything can say Hi :)

@Html.Hi();
@Request.Hi();   
@this.Hi();

但是@Hi()不起作用.有没有办法使@Hi()工作?

But @Hi() doesn't work. Is there a way to make @Hi() work?

推荐答案

C#仅允许您调用对象实例限定的扩展方法.
如果您有一个扩展方法来扩展您的类型，则不能直接"调用它.您需要写this.ExtensionMethod().

C# only allows you to call extension methods qualified by an object instance.
If you have an extension method that extends your type, you can't call it "directly"; you need to write this.ExtensionMethod().

要做的唯一方法是创建一个继承WebPage的类(对于MVC视图，则为WebViewPage)，然后将Razor页面更改为继承该类(使用@inherits指令)

The only way to do what you're asking for is to make a class which inherits WebPage (or WebViewPage for MVC views) and change your Razor page to inherit that class (using the @inherits directive)

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