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上傳圖片,限制類型,大小,規(guī)格
/// <summary>
    /// asp.net上傳圖片并生成縮略圖
    /// </summary>
    /// <param name="upImage">HtmlInputFile控件</param>
    /// <param name="sSavePath">保存的路徑,些為相對服務(wù)器路徑的下的文件夾</param>
    /// <param name="sThumbExtension">縮略圖的thumb</param>
    /// <param name="intThumbWidth">生成縮略圖的寬度</param>
    /// <param name="intThumbHeight">生成縮略圖的高度</param>
    /// <returns>縮略圖名稱</returns>
    public string UpLoadImage(FileUpload upImage, string savePath, string sThumbExtension, int intThumbWidth, int intThumbHeight)
    {
        if (upImage.HasFile)
        {
            if (upImage.PostedFile.ContentLength > 0 && upImage.PostedFile.ContentLength / 1024 < 1024)
            {
                string imgType = upImage.PostedFile.ContentType.ToString(); // 圖片類型
                if (imgType.Equals("image/pjpeg") || imgType.Equals("image/gif") || imgType.Equals("image/png"))
                {
                    //取得上傳文件的擴展名
                    string strExt = upImage.PostedFile.FileName.Substring(upImage.PostedFile.FileName.LastIndexOf("."));
                    // 自定義名稱保存
                    string newImaName = (sThumbExtension + strExt).ToString();
                    // 保存到指定目錄
                    string newsavePath = Server.MapPath(savePath);

                    System.Drawing.Image img = System.Drawing.Image.FromFile(upImage.PostedFile.FileName);
                    if (img.Width < intThumbWidth && img.Height < intThumbHeight)
                    {
                        return "圖片的寬度和高度不符合(" + intThumbWidth + "*" + intThumbHeight+")";
                    }
                    else
                    {
                        upImage.PostedFile.SaveAs(newsavePath + newImaName);
                        return "上傳圖片成功.";
                    }

                 
                    //try
                    //{
                    //    //原圖加載
                    //    using (System.Drawing.Image sourceImage = System.Drawing.Image.FromFile(upImage.PostedFile.FileName))
                    //    {
                    //        //原圖寬度和高度
                    //        int width = sourceImage.Width;
                    //        int height = sourceImage.Height;
                    //        int smallWidth;
                    //        int smallHeight;
                    //        //獲取第一張繪制圖的大小,(比較 原圖的寬/縮略圖的寬  和 原圖的高/縮略圖的高)
                    //        if (((decimal)width) / height <= ((decimal)intThumbWidth) / intThumbHeight)
                    //        {
                    //            smallWidth = intThumbWidth;
                    //            smallHeight = intThumbWidth * height / width;
                    //        }
                    //        else
                    //        {
                    //            smallWidth = intThumbHeight * width / height;
                    //            smallHeight = intThumbHeight;
                    //        }

                    //        // 新建一個圖板,以最小等比例壓縮大小繪制原圖
                    //        using (System.Drawing.Image bitmap = new System.Drawing.Bitmap(smallWidth, smallHeight))
                    //        {
                    //            //繪制中間圖
                    //            using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
                    //            {
                    //                //高清,平滑
                    //                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
                    //                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                    //                g.Clear(Color.Black);
                    //                g.DrawImage(
                    //                    sourceImage,
                    //                    new System.Drawing.Rectangle(0, 0, smallWidth, smallHeight),
                    //                    new System.Drawing.Rectangle(0, 0, width, height),
                    //                    System.Drawing.GraphicsUnit.Pixel);
                    //            }
                    //            //新建一個圖板,以縮略圖大小繪制中間圖
                    //            using (System.Drawing.Image bitmap1 = new System.Drawing.Bitmap(intThumbWidth, intThumbHeight))
                    //            {
                    //                //繪制縮略圖
                    //                using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap1))
                    //                {
                    //                    //高清,平滑
                    //                    g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
                    //                    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                    //                    g.Clear(Color.Black);
                    //                    int lwidth = (smallWidth - intThumbWidth) / 2;
                    //                    int bheight = (smallHeight - intThumbHeight) / 2;
                    //                    g.DrawImage(bitmap, new Rectangle(0, 0, intThumbWidth, intThumbHeight), lwidth, bheight, intThumbWidth, intThumbHeight, GraphicsUnit.Pixel);
                    //                    g.Dispose();
                    //                    //縮略圖保存的絕對路徑
                    //                    bitmap1.Save(newsavePath, System.Drawing.Imaging.ImageFormat.Jpeg);
                    //                }
                    //            }
                    //        }

                    //    }
                    //}
                    //catch(Exception ex)
                    //{
                    //   return ex.Message.ToString();
                    //}
                 
                }
                else
                {
                    return "圖片類型不正確.";
                }

            }
            else
            {
                return "請選擇不大于1M的圖片.";
            }
        }
        else
        {
            return "沒有選擇圖片";
        }
    }
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