@ Helper helper method and @ functons UDF, @ Helper @ functons

@ Helper helper method and @ functons UDF, @ Helper @ functons

1. First, let's talk about the @ helper auxiliary method. When we use the same method in multiple views, we can strip this method out and put it in one location, in this case, you can use the @ Helper method. First, right-click the solution and add

App_Code folder, add a cshtml file, clear the content of the original file, and then put the custom method in it, for example

@ Helper Show (int I) {if (I = 1) {@: The value is 1} else {@: The value is other }}

2. When we want to implement more complex logic, for example, if we want to return a value, we can use the @ functions keyword to customize the function, as shown below:

@functions{public static IHtmlString GetYesterday()    {        var theDay = DateTime.Now.AddDays(-1);        return new HtmlString(theDay.ToString());    }}

Note that the static keyword must be used for modification in this place. Otherwise, this method cannot be called on other pages through the class, and the type of return value returned to the view must be defined as IHtmlString.

Supplement: When a new type is introduced to a page, the namespace may be too long, resulting in a lot of repeated code between pages. You can import the namespace at the beginning of the view page,

As follows: @ model IEnumrable <MVC. Test. Animal> can be changed

@ Using MVC. Test

@ Model IEnumrable <Animal>;

When the same namespace is introduced to all view pages, you can avoid using @ using to introduce each page. The view directory contains the web. config file.

The namespace used to add the <system. web. webPages. razor> section to each page is as follows:

<system.web.webPages.razor>