旋转图像
aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Rotate.aspx.cs" Inherits="Rotate" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>图像翻转</title></head><body> <form id="form1" runat="server"> <div> <asp:Image ID="Image1" runat="server" ImageUrl="~/sample.jpg" /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <asp:DropDownList ID="DropDownList1" runat="server"> <asp:ListItem Value="Rotate180FlipX">垂直翻转180度</asp:ListItem> <asp:ListItem Value="Rotate180FlipY">水平翻转180度</asp:ListItem> <asp:ListItem Value="Rotate90FlipNone">旋转90度</asp:ListItem> <asp:ListItem Value="Rotate180FlipNone">旋转180度</asp:ListItem> </asp:DropDownList> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /></div> </form></body></html>aspx.csusing System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Drawing;using System.Drawing.Imaging;using System.IO;public partial class Rotate : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ string imgpath = Server.MapPath("temp.jpg"); //如果不存在一个临时图像文件,则生成一个临时图像文件 if (!File.Exists(imgpath)) { File.Copy(Server.MapPath("sample.jpg"), imgpath);
} } public string ReversalImage(string ch) { string imgpath = Server.MapPath("temp.jpg"); Bitmap image = new Bitmap(imgpath); //翻转图像 switch (ch) { case "Rotate180FlipX": image.RotateFlip(RotateFlipType.Rotate180FlipX); break; case "Rotate180FlipY": image.RotateFlip(RotateFlipType.Rotate180FlipY); break; case "Rotate90FlipNone": image.RotateFlip(RotateFlipType.Rotate90FlipNone); break; case "Rotate180FlipNone": image.RotateFlip(RotateFlipType.Rotate180FlipNone); break; default: image.RotateFlip(RotateFlipType.RotateNoneFlipNone); break; } //把图像保存到临时文件 image.Save(imgpath, ImageFormat.Jpeg); return imgpath; } protected void Button1_Click(object sender, EventArgs e) { Image1.ImageUrl = ReversalImage(DropDownList1.SelectedItem.Value); }
}