Razor 网页:如何创建可用于所有页面的变量? [英] Razor web pages: How do I create variable that is available to all pages?

问题描述

我有很多使用相同变量的页面.我想在一个页面中创建这些，这样我就不必一遍又一遍地输入它们.我该怎么做?

I have a lot of pages that is using the same variables. I would like to create these in a single page so I dont have to type them over and over again. How do I do this?

我尝试了 _appStart.cshtml 和 _PageStart.cshtml，但是当我运行我的内容页面时出现错误当前上下文中不存在名称 selectedData"

I tried both _appStart.cshtml and _PageStart.cshtml, but when i run my content page i get error "the name selectedData does not exist in the current context"

这是我的 _PageStart.cshtml:(也试过 _appstart.cshtml)

Here is my _PageStart.cshtml: (tried _appstart.cshtml too)

@{
var db = Database.Open("razortest");
var selectQueryString  = "SELECT * FROM tbl_stasjon ORDER BY nr";
var selectedData = db.Query(selectQueryString);
}        

我所有的页面都包含这个:

And all of my pages includes this:

@foreach(var row in (selectedData)) {

html here...    

}

推荐答案

对于一个相当直接的解决方案，您可以在 App_Code 中创建一个静态类/方法，返回您的查询对象，然后调用它任何需要的方法:

For a fairly straight-forward solution you could create a static class/method within App_Code that returns your query object and then call that method wherever you need it:

using System;
using System.Collections.Generic;
using System.Web;
using WebMatrix.Data;

public static class MyClass
{
    public static IEnumerable<dynamic> GetData()
    {
        var db = Database.Open("razortest");
        var selectQueryString  = "SELECT * FROM tbl_stasjon ORDER BY nr";
        return db.Query(selectQueryString);
    }
}

然后在你的脚本中你可以:

Then in your scripts you can do:

@foreach(var row in MyClass.GetData()) {
    html here...
}

可能会有更优雅、更高效的方法来实现这一点，但它们取决于您究竟在做什么.出于遵循教程的目的，这应该符合您的目的.

There will likely be more elegant and performant ways to achieve this but they depend on what exactly you're doing. For the purposes of following a tutorial this should serve your purposes.

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