基于.NET Core2的图片上传

其实，.NET Core2的图片上传挺好做的，只是，有些坑要注意。。。。。。。话不多说，上代码

  public async Task<IActionResult> Upload([FromServices]IHostingEnvironment environment)
        {
            
            var data = new PicData();
            string path = string.Empty;
            var files = Request.Form.Files.Where(c => c.Name == "MyPhoto01");
            if (files == null || files.Count() <= 0) { data.Msg = "请选择上传的文件。"; return Json(data); }
            //格式限制
            var allowType = new string[] { "image/jpg", "image/png" };
            if (files.Any(c => allowType.Contains(c.ContentType)))
            {
                if (files.Sum(c => c.Length) <= 1024 * 1024 * 4)
                {
                    foreach (var file in files)
                    {
                        string strpath = Path.Combine("Upload", DateTime.Now.ToString("MMddHHmmss") + file.FileName);
                        path = Path.Combine(environment.WebRootPath, strpath);

                        using (var stream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite))
                        {
                            await file.CopyToAsync(stream);
                        }
                    }
                    data.Msg = "上传成功";
                    return Json(data);
                }
                else
                {
                    data.Msg = "图片过大";
                    return Json(data);
                }
            }
            else

            {
                data.Msg = "图片格式错误";
                return Json(data);
            }
        }
public class PicData
    {
        public string Msg { get; set; }
    }

注意:([FromServices]IHostingEnvironment environment,一定要加上FromServices这个特性!!!