asp.net生成缩略图，打水印得类

最新推荐文章于 2025-09-03 20:11:34 发布

原创最新推荐文章于 2025-09-03 20:11:34 发布 · 489 阅读

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文章标签：

#asp.net #image #exception #string #null #class

本文提供了一个ASP.NET中用于图片处理的实用类，包括生成缩略图和添加水印的功能。支持多种位置放置水印，并可根据不同模式调整缩略图大小。

asp.net生成缩略图，打水印得类，代码如下：

using System;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Imaging;



namespace BLL

{

    public class ImageUtil

    {

        public static void addWatermarkImage(Graphics picture, string WaterMarkPicPath, string _watermarkPosition, int _width, int _height)

        {

            Image image = new Bitmap(WaterMarkPicPath);

            int x = 0;

            int y = 0;

            int width = image.Width;

            int height = image.Height;

            string str = _watermarkPosition;

            if (str != null)

            {

                if (!(str == "WM_TOP_LEFT"))

                {

                    if (str == "WM_TOP_RIGHT")

                    {

                        x = (_width - width) - 10;

                        y = 10;

                    }

                    else if (str == "WM_BOTTOM_RIGHT")

                    {

                        x = (_width - width) - 10;

                        y = (_height - height) - 10;

                    }

                    else if (str == "WM_BOTTOM_LEFT")

                    {

                        x = 10;

                        y = (_height - height) - 10;

                    }

                    else if (str == "WM_BOTTOM_MIDDLE")

                    {

                        x = (_width / 2) - (width / 2);

                        y = (_height - height) - 10;

                    }

                    else if (str == "WM_TOP_MIDDLE")

                    {

                        x = (_width / 2) - (width / 2);

                        y = 10;

                    }

                }

                else

                {

                    x = 10;

                    y = 10;

                }

            }

            picture.DrawImage(image, x, y, width, height);

            image.Dispose();

        }



        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)

        {

            string str;

            Image image = Image.FromFile(originalImagePath);

            int num = width;

            int num2 = height;

            int x = 0;

            int y = 0;

            int num5 = image.Width;

            int num6 = image.Height;

            if (((str = mode) != null) && (str != "HW"))

            {

                if (!(str == "W"))

                {

                    if (str == "H")

                    {

                        num = (image.Width * height) / image.Height;

                    }

                    else if (str == "Cut")

                    {

                        if ((((double)image.Width) / ((double)image.Height)) > (((double)num) / ((double)num2)))

                        {

                            num6 = image.Height;

                            num5 = (image.Height * num) / num2;

                            y = 0;

                            x = (image.Width - num5) / 2;

                        }

                        else

                        {

                            num5 = image.Width;

                            num6 = (image.Width * height) / num;

                            x = 0;

                            y = (image.Height - num6) / 2;

                        }

                    }

                }

                else

                {

                    num2 = (image.Height * width) / image.Width;

                }

            }

            Image image2 = new Bitmap(num, num2);

            Graphics graphics = Graphics.FromImage(image2);

            graphics.InterpolationMode = InterpolationMode.High;

            graphics.SmoothingMode = SmoothingMode.HighQuality;

            graphics.Clear(Color.Transparent);

            graphics.DrawImage(image, new Rectangle(0, 0, num, num2), new Rectangle(x, y, num5, num6), GraphicsUnit.Pixel);

            try

            {

                image2.Save(thumbnailPath, ImageFormat.Jpeg);

            }

            catch (Exception exception)

            {

                throw exception;

            }

            finally

            {

                image.Dispose();

                image2.Dispose();

                graphics.Dispose();

            }

        }

    }



}