private async Task <string> ExtractRawTextAsync(IFormFile formFile)
{
var tempDirectory = Path.Combine(Directory.GetParent(hostingEnvironment.WebRootPath).FullName, "App_Data", "Temp");
if (!Directory.Exists(tempDirectory))
{
Directory.CreateDirectory(tempDirectory);
}
var fileName = formFile.ExtractFileName();
var fullpath = Path.Combine(tempDirectory, formFile.GetHashCode() + new FileInfo(fileName).Name);
await formFile.SaveAsAsync(fullpath);
var extension = fileName.Substring(fileName.LastIndexOf('.'));
var wrapped = WrapperFactory[extension](fullpath);
return(await wrapped.LoadTextAsync());
}