c# - 如何在 ASP Core 的静态类中使用 "IWebHostEnvironment"

Question

有没有办法在 ASP Core 的静态类中使用“IWebHostEnvironment”？

我的类(class):

public class MainHelper
{
    private readonly IWebHostEnvironment _hostingEnvironment;

    public MainHelper(IWebHostEnvironment hostingEnvironment)
    {
        _hostingEnvironment = hostingEnvironment;
    }    

    public static void SaveFile(IFormFile file)
    {
            var path = Path.Combine(_hostingEnvironment.WebRootPath, "uploads");
            if (!Directory.Exists(path))
                Directory.CreateDirectory(path);

            using (var fileStream = System.IO.File.Create(Path.Combine(path, file.FileName)))
            {
                file.CopyTo(fileStream);
            }
    }
}

我的行有错误:

var path = Path.Combine(_hostingEnvironment.WebRootPath, "uploads");

错误: c# session 非静态字段方法或属性“MainHelper._hostingEnvironment”需要对象引用

请指教

Answer 1

因为接受的答案是一个。但是如果有人提到在静态类中没有初始化就使用:

    using Microsoft.AspNetCore.Http;
    using Microsoft.Extensions.DependencyInjection;

    public class Common{
          public static IWebHostEnvironment WebEnv()
            {
                var _accessor = new HttpContextAccessor();
                return _accessor.HttpContext.RequestServices.GetRequiredService<IWebHostEnvironment>();
            }
        }

用法:

var path = Common.WebEnv().WebRootPath;