NetCore获取文件内容

1、注入IWebHostEnvironment

private IWebHostEnvironment _hostEnvironment;
public FormBaseController(IWebHostEnvironment hostEnvironment)
{
    _hostEnvironment = hostEnvironment;
}

2、读取根目录下文件内容（Templates/Index.html）

public async Task<IActionResult> GetFormPageFileName()
{
    IFileProvider fileProvider = this._hostEnvironment.ContentRootFileProvider;
    IFileInfo fileInfo = fileProvider.GetFileInfo("Templates/Index.html");

    string fileContent = null;
    using (StreamReader readSteam = new StreamReader(fileInfo.CreateReadStream()))
    {
        fileContent = await readSteam.ReadToEndAsync();
    }
    return View(fileContent);
}