封装的一些实现图片水印与图片自动结合缩放的类

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using System;
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using System.Data;
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using System.Configuration;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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using System.Drawing;
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namespace WebHelper
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{
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/**//// <summary>
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/// ImageHelper 的摘要说明
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/// </summary>
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public class ImageHelper
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{
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public ImageHelper()
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{
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//
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// TODO: 在此处添加构造函数逻辑
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//
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}
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Image水印#region Image水印
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/**//// <summary>
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/// 写入图像水印
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/// </summary>
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/// <param name="str">水印字符串</param>
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/// <param name="filePath">原图片位置</param>
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/// <param name="savePath">水印加入后的位置</param>
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/// <returns></returns>
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public string CreateBackImage(System.Web.UI.Page pageCurrent, string str, string filePath, string savePath, int x, int y)
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{
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System.Drawing.Image img = System.Drawing.Image.FromFile(pageCurrent.MapPath(filePath));
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//创建图片
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Graphics graphics = Graphics.FromImage(img);
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//指定要绘制的面积
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graphics.DrawImage(img, 0, 0, img.Width, img.Height);
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//定义字段和画笔
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Font font = new Font("黑体", 16);
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Brush brush = new SolidBrush(Color.Yellow);
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graphics.DrawString(str, font, brush, x, y);
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//保存并输出图片
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img.Save(pageCurrent.MapPath(savePath), System.Drawing.Imaging.ImageFormat.Jpeg);
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return savePath;
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}
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#endregion
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Image自动缩小#region Image自动缩小
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/**//// <summary>
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/// 缩小图片到指定的大小
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/// </summary>
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/// <param name="strOldPic">
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/// 原图片的位置
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/// </param>
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/// <param name="strNewPic">
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/// 缩小后的图片位置
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/// </param>
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/// <param name="intWidth">
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/// 宽度
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/// </param>
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/// <param name="intHeight">
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/// 高度
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/// </param>
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public void SmallPic(string strOldPic, string strNewPic, int intWidth, int intHeight)
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{
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System.Drawing.Bitmap objPic, objNewPic;
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try
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{
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objPic = new System.Drawing.Bitmap(strOldPic);
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objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);
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objNewPic.Save(strNewPic);
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}
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catch (Exception exp)

{ throw exp; }
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finally
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{
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objPic = null;
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objNewPic = null;
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}
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}
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public void SmallPic(string strOldPic, string strNewPic, int intWidth)
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{
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System.Drawing.Bitmap objPic, objNewPic;
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try
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{
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objPic = new System.Drawing.Bitmap(strOldPic);
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int intHeight = Convert.ToInt32(((intWidth * 1.0) / (objPic.Width * 1.0)) * objPic.Height);
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objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);
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objNewPic.Save(strNewPic, objPic.RawFormat);
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}
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catch (Exception exp)

{ throw exp; }
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finally
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{
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objPic = null;
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objNewPic = null;
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}
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}
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//public void SmallPic(string strOldPic, string strNewPic, int intHeight)
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//{
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// System.Drawing.Bitmap objPic, objNewPic;
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// try
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// {
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// objPic = new System.Drawing.Bitmap(strOldPic);
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// int intWidth = Convert.ToInt32(((intHeight * 1.0) / objPic.Height) * objPic.Width);
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// objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);
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// objNewPic.Save(strNewPic, objPic.RawFormat);
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// }
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// catch (Exception exp) { throw exp; }
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// finally
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// {
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// objPic = null;
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// objNewPic = null;
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// }
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//}
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#endregion
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}
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}