限制圖片

protected void ibtnAdd_Click(object sender, ImageClickEventArgs e)
  {
  string strProductPic = "", filepath = "";
  if (FupFoodPic.HasFile == true)
  {
  strProductPic = this.FupFoodPic.FileName;
  string strPicPath = FupFoodPic.PostedFile.FileName;
  string type = strProductPic.Substring(strProductPic.LastIndexOf(".") + 1).ToLower();//獲取文件的類型

  //限制圖片的分辨率
  System.Drawing. Image img = System.Drawing. Image.FromStream(FupFoodPic.PostedFile.InputStream);
  int width = img.Width;
  int heigth = img.Height;
  if (width > 136 && heigth > 136)
  {
  Confirm("圖片分辨率僅限於136*136以下！", "btnUpPicture", this.Page);
  return;
  }

  if (type != "jpg" & type != "jpeg" & type != "bmp" & type != "gif" & type != "png")
  {
  Confirm("上傳失敗,格式錯誤,僅支持jpg,gif,png,bmp圖片格式！", "btnUpPicture", this.Page);
  return;
  }

  //限制相片大小
  else if (FupFoodPic.PostedFile.ContentLength > 256000)
  {
  Confirm("圖片大小超出範圍,上傳失敗,僅限於256KB以下！", "ibtnAdd", this.Page);
  return;
  }

  filepath = MapPath("../img/Food/" + DateTime.Now.ToString("yyyyMMddHHmmss") + "." + type);
  if (!File.Exists(filepath))
  {
  this.FupFoodPic.SaveAs(filepath);//圖片保存服務器磁盤

  //數據保存在數據庫  
  food.FoodName = this.txtFoodName.Text.Trim();
  food.FoodPic = "../img/Food/" + DateTime.Now.ToString("yyyyMMddHHmmss") + "." + type;//相片路徑保存到數據庫
  food.FoodPicName = DateTime.Now.ToString("yyyyMMddHHmmss") + "." + type;//圖片名稱
  food.FoodMaterial = this.txtFoodyuanliao.Text.Trim();
  food.FoodDo = this.txtFoodDo.Text.Trim();
  food.FoodNutrition = this.txtJiaZhi.Text.Trim();
  food.AddTime = DateTime.Now.ToString("yyyy年MM月dd日HH時mm分ss秒");//添加時間  

  int foodId = TipsManager.AddFoods(food);
  if (foodId > 0)
  {
  Confirm("數據添加成功！", "ibtnAdd", this.Page);
  ClearText();
  DataBind();
  this.lblTotal.Text = "第1頁/共" + (gvView.PageCount) + "頁";
  return;
  }
  else
  {
  Confirm("數據添加失敗！", "ibtnAdd", this.Page);
  ClearText();
  return;
  }
  }
  else
  {
  Confirm("上傳失敗,同名相片存在！", "ibtnAdd", this.Page);
  return;
  }
  }
  }