.Net 上传文件IFormFile

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public async Task<ResultEntity> UploadUserAvatarAsync(IFormFile file, CancellationToken cancellationToken) {     try     {           if (file.Equals("") || file == null || file.Length == 0)         {             this.ResultEntity.Result = false;             this.ResultEntity.ErrorMessage = GetMessage("ME0024");         }           // 获取当前的工作路径         var currentDirectory = Directory.GetCurrentDirectory();           if (currentDirectory != null)         {               // 创建名为image的文件夹路径             var imagePath = Path.Combine(currentDirectory, "image");               if (!Directory.Exists(imagePath))             {                 Directory.CreateDirectory(imagePath);             }               // 拼接文件路径             var filePath = Path.Combine(imagePath, file.FileName);               Console.WriteLine(filePath);               // 保存到指定的路径             using (FileStream stream = new FileStream(filePath, FileMode.Create))             {                 await file.CopyToAsync(stream);             }             this.ResultEntity.Result = true;             this.ResultEntity.Message = GetMessage("MI0001");               this.ResultEntity.Data = file;         }         else         {             this.ResultEntity.Result = false;         }           return this.ResultEntity;     }catch (Exception ex)     {         throw ex;     }   }