在ConfigureServices(aspnetcore)中获取wwwroot路径 [英] Get wwwroot path when in ConfigureServices (aspnetcore)

问题描述

在我的aspnetcore应用(v2.1)中，我需要配置一个〜/wwwroot/App_Data/quranx.db中的只读数据库(entityframework核心+ SQLite)

In my aspnetcore app (v2.1) I need to configure a read-only database (entityframework core + SQLite) which is in ~/wwwroot/App_Data/quranx.db

我需要在Startup.ConfigureServices中调用此代码

I need to call this code in Startup.ConfigureServices

services.AddDbContext<QuranXDataContext>(options => options
    .UseSqlite($"Data Source={databasePath}")
    .UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking)
);

但是到那时，我找不到找到wwwroot路径的方法.要获得该路径，我需要 IHostingEnvironment ，但是直到调用 Startup.Configure 且在 Startup.ConfigureServices <之后，我才能获得对此的引用./code>完成.

But at that point I cannot find a way to get the path to wwwroot. To get that path I need IHostingEnvironment, but I am unable to get a reference to that until Startup.Configure is called, and that is after Startup.ConfigureServices has finished.

这是怎么做的?

推荐答案

在 ConfigureServices 中访问 IHostingEnvironment 很容易(我已经在下面说明了)，但是在您之前阅读详细信息，并在评论Chris Pratt的警告中了解有关如何在wwwroot中存储数据库是一个非常坏主意.

It's easy enough to access IHostingEnvironment in ConfigureServices (I've explained how below) but before you read the specifics, take a look at Chris Pratt's warning in the comments about how storing a database in wwwroot is a very bad idea.

您可以在 Startup 类中采用类型为 IHostingEnviroment 的构造函数参数，并将其捕获为字段，然后可以在 ConfigureServices :

You can take a constructor parameter of type IHostingEnviroment in your Startup class and capture that as a field, which you can then use in ConfigureServices:

public class Startup
{
    private readonly IHostingEnvironment _env;

    public Startup(IHostingEnvironment env)
    {
        _env = env;
    }

    public void ConfigureServices(IServiceCollection services)
    {
        // Use _env.WebRootPath here.
    }

    // ...
}

对于ASP.NET Core 3.0+，请使用 IWebHostEnvironment 而不是 IHostingEnvironment .

For ASP.NET Core 3.0+, use IWebHostEnvironment instead of IHostingEnvironment.

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