.net core获取文件内容

参考微软提供帮助文档：ASP.NET Core 中的文件提供程序

1-注入IWebHostEnvironment：

private IWebHostEnvironment _hostEnvironment;

2-读取根目录下文件内容（Templates/Index.html）：

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();
}