如何在 ASP.Net Core 中为 Server.MapPath 获取绝对路径替代方法 [英] How to get absolute path in ASP.Net Core alternative way for Server.MapPath

问题描述

Server.MapPath

我尝试使用 IHostingEnvironment 但它没有给出正确的结果.

I have tried to use IHostingEnvironment but it doesn't give proper result.

IHostingEnvironment env = new HostingEnvironment();
var str1 = env.ContentRootPath; // Null
var str2 = env.WebRootPath; // Null, both doesn't give any result 

我在 wwwroot 文件夹中有一个图像文件 (Sample.PNG)，我需要获取此绝对路径.

I have one image file (Sample.PNG) in wwwroot folder I need to get this absolute path.

推荐答案

从 .Net Core v3.0 开始，它应该是 IWebHostEnvironment 以访问 WebRootPath 已移至 Web 特定环境界面.

As of .Net Core v3.0, it should be IWebHostEnvironment to access the WebRootPath which has been moved to the web specific environment interface.

将 IWebHostEnvironment 作为依赖项注入依赖类.该框架将为您填充它

Inject IWebHostEnvironment as a dependency into the dependent class. The framework will populate it for you

public class HomeController : Controller {
    private IWebHostEnvironment _hostEnvironment;

    public HomeController(IWebHostEnvironment environment) {
        _hostEnvironment = environment;
    }

    [HttpGet]
    public IActionResult Get() {
        string path = Path.Combine(_hostEnvironment.WebRootPath, "Sample.PNG");
        return View();
    }
}

您可以更进一步，创建自己的路径提供者服务抽象和实现.

You could go one step further and create your own path provider service abstraction and implementation.

public interface IPathProvider {
    string MapPath(string path);
}

public class PathProvider : IPathProvider {
    private IWebHostEnvironment _hostEnvironment;

    public PathProvider(IWebHostEnvironment environment) {
        _hostEnvironment = environment;
    }

    public string MapPath(string path) {
        string filePath = Path.Combine(_hostEnvironment.WebRootPath, path);
        return filePath;
    }
}

并将 IPathProvider 注入依赖类.

public class HomeController : Controller {
    private IPathProvider pathProvider;

    public HomeController(IPathProvider pathProvider) {
        this.pathProvider = pathProvider;
    }

    [HttpGet]
    public IActionResult Get() {
        string path = pathProvider.MapPath("Sample.PNG");
        return View();
    }
}

确保将服务注册到 DI 容器

Make sure to register the service with the DI container

services.AddSingleton<IPathProvider, PathProvider>();

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