使用WebUploader使用，及使用后测试横拍或竖拍图片图片方向不对等解决方案

<%@ WebHandler Language="C#" Class="UploadHandleringNew" %>

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.IO;
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 ysw.BLL;
using ysw.Models;
using System.Drawing;

public class UploadHandleringNew : IHttpHandler, System.Web.SessionState.IRequiresSessionState
{
public string camera = String.Empty;//机型
public string focalLength = String.Empty;//焦距
public string shutterSpeed = String.Empty;//速度
public string aperture = String.Empty;//光圈
public string iso = String.Empty;//感光度
public string treePath = System.Web.HttpContext.Current.Server.MapPath("~/");
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
context.Response.Charset = "utf-8";
context.Response.ContentEncoding = System.Text.Encoding.UTF8;
System.Collections.Generic.IList<TempImages> list = new System.Collections.Generic.List<TempImages>();
if (context.Session["TempImageList"] != null)
{
list = context.Session["TempImageList"] as System.Collections.Generic.IList<TempImages>;
}

if (list.Count >= 6)
{
context.Response.Write("上传数量已经超出系统限制的6个文件");
return;

}
else
{
HttpPostedFile file = context.Request.Files[0];
string uploadPath = HttpContext.Current.Server.MapPath(@context.Request["folder"]) + "\\";

if (file != null)
{
if (!System.IO.Directory.Exists(uploadPath))
{
System.IO.Directory.CreateDirectory(uploadPath);
}
Random random = new Random();
string fileName = DateTime.Now.ToString("yyyy-MM-dd") + "-" + random.Next(999999999) + file.FileName.Substring(file.FileName.Length - 4);     // 文件名称
string fileName_s = "x_" + fileName;      // 缩略图文件名称
string fileName_syp = "water_" + fileName; // 水印图文件名称（图片)
string webFilePath = "";
string webFilePath_s = "";
string webFilePath_s1 = "";
string webFilePath_syp = "";
webFilePath = treePath + @"originalImages\" + fileName;   // 服务器端文件路径
webFilePath_s = treePath + @"thumbnails\" + fileName_s; // 服务器端缩略图路径
webFilePath_syp = treePath + @"waterImages\" + fileName_syp;　// 服务器端带水印图路径(图片)
webFilePath_s1 = treePath + @"thumbnails166\" + fileName_s; // 服务器端缩略图路径
string webFilePath_sypf = System.Web.HttpContext.Current.Server.MapPath(@"~/images/synew.png");　     // 服务器端水印图路径(图片)
file.SaveAs(webFilePath);

AddWaterPic(webFilePath, webFilePath_syp, webFilePath_sypf);//生成图片水印图

int towidth = 0;
int toheight = 0;
//MakeImage1(webFilePath, webFilePath_syp, 500);
MakeImage(webFilePath, webFilePath_s, 235);
//将临时数据保存到临时表中
TempImages tempImage = new TempImages();
tempImage.ISBN = fileName;
if (context.Session["UserInfo"] != null)
{
tempImage.UserId = (context.Session["UserInfo"] as ysw.Model.UserInfo).Id;
}
else
{
tempImage.UserId = 2;
}

tempImage.CreateTime = DateTime.Now;
tempImage.Id = TempImageManager.AddTempImages(tempImage);
if (tempImage.Id > 0)
{
list.Add(tempImage);
context.Session["TempImageList"] = list;
string str = "waterImages/" + fileName_syp + ",thumbnails/" + fileName_s + "," + camera + "," + focalLength + "," + shutterSpeed + "," + aperture + "," + iso;
//上传成功后让上传队列的显示自动消失
//string str = fileName + ",";
//int toheight1 = 90;
// int towidth1 = 90;
// if ((double)towidth >(double)toheight)
// {
//     toheight1 = toheight * 90 / towidth;
// }
// else
// {
//     towidth1 = towidth * 90 / toheight;
// }
// str += towidth1 + "," + toheight1;
context.Response.Write(str);
}
else
{
context.Response.Write("0");
}
}
else
{
context.Response.Write("0");
}
}
}
public static void rotating(string Path_syp)
{
System.Drawing.Image img = System.Drawing.Image.FromFile(Path_syp);

System.Drawing.Imaging.PropertyItem[] exif = img.PropertyItems;
byte orientation = 0;
foreach (System.Drawing.Imaging.PropertyItem i in exif)
{
if (i.Id == 274)
{
orientation = i.Value[0];
i.Value[0] = 1;
img.SetPropertyItem(i);
}
}

switch (orientation)
{
case 2:
img.RotateFlip(RotateFlipType.RotateNoneFlipX);
break;
case 3:
img.RotateFlip(RotateFlipType.Rotate180FlipNone);
break;
case 4:
img.RotateFlip(RotateFlipType.RotateNoneFlipY);
break;
case 5:
img.RotateFlip(RotateFlipType.Rotate90FlipX);
break;
case 6:
img.RotateFlip(RotateFlipType.Rotate90FlipNone);
break;
case 7:
img.RotateFlip(RotateFlipType.Rotate270FlipX);
break;
case 8:
img.RotateFlip(RotateFlipType.Rotate270FlipNone);
break;
default:
break;

}
foreach (System.Drawing.Imaging.PropertyItem i in exif)
{
if (i.Id == 40962)
{
i.Value = BitConverter.GetBytes(img.Width);
}
else if (i.Id == 40963)
{
i.Value = BitConverter.GetBytes(img.Height);
}
}

//System.Drawing.Image bitmap = new System.Drawing.Bitmap(500, 500);

//System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);

//    //以jpg格式保存缩略图
//    bitmap.Save(Path_syp, System.Drawing.Imaging.ImageFormat.Jpeg);

//    //image.Dispose();
//    bitmap.Dispose();
//    g.Dispose();

}
/// <summary>
/// 生成缩略图方法(700px图片)
/// </summary>
/// <param name="webFilePath"></param>
/// <param name="webFilePath_s"></param>
/// <param name="size"></param>
private static void MakeImage1(string webFilePath, string webFilePath_s, int size)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(webFilePath);
int towidth = size;
int toheight = size;
int x = 0;
int y = 0;
int ow = image.Width;
int oh = image.Height;
toheight = image.Height * size / image.Width;
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);              //新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);              //设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;              //设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;              //清空画布并以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);              //在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(image, new System.Drawing.Rectangle(0, 0, towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel);
g.Dispose();
bitmap.Save(webFilePath_s, System.Drawing.Imaging.ImageFormat.Jpeg);
image.Dispose();
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="webFilePath">原图的路径</param>
/// <param name="webFilePath_s">缩略图的路径</param>
/// <param name="size">缩略图的大小</param>
public static void MakeImage(string webFilePath, string webFilePath_s, int size)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(webFilePath);
int towidth = size;
int toheight = size;
int x = 0;
int y = 0;
int ow = image.Width;
int oh = image.Height;

if ((double)image.Width / (double)image.Height > (double)towidth / (double)toheight)
{
oh = image.Height;
ow = image.Height * towidth / toheight;
y = 0;
x = 0;
}
else
{
ow = image.Width;
oh = image.Width * toheight / towidth;
x = 0;
y = 0;
}
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);              //新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);              //设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;              //设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;              //清空画布并以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);              //在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(image, new System.Drawing.Rectangle(0, 0, towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel);
try
{
//以jpg格式保存缩略图
bitmap.Save(webFilePath_s, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
image.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
/// <summary>
/// 生成水印缩略图
/// </summary>
/// <param name="Path"></param>
/// <param name="Path_syp"></param>
/// <param name="Path_sypf"></param>
protected void AddWaterPic(string Path, string Path_syp, string Path_sypf)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);

System.Drawing.Imaging.PropertyItem[] exif = image.PropertyItems;
byte orientation = 0;
foreach (System.Drawing.Imaging.PropertyItem i in exif)
{
if (i.Id == 274)
{
orientation = i.Value[0];
i.Value[0] = 1;
image.SetPropertyItem(i);
}
}

switch (orientation)
{
case 2:
image.RotateFlip(RotateFlipType.RotateNoneFlipX);
break;
case 3:
image.RotateFlip(RotateFlipType.Rotate180FlipNone);
break;
case 4:
image.RotateFlip(RotateFlipType.RotateNoneFlipY);
break;
case 5:
image.RotateFlip(RotateFlipType.Rotate90FlipX);
break;
case 6:
image.RotateFlip(RotateFlipType.Rotate90FlipNone);
break;
case 7:
image.RotateFlip(RotateFlipType.Rotate270FlipX);
break;
case 8:
image.RotateFlip(RotateFlipType.Rotate270FlipNone);
break;
default:
break;

}
foreach (System.Drawing.Imaging.PropertyItem i in exif)
{
if (i.Id == 40962)
{
i.Value = BitConverter.GetBytes(image.Width);
}
else if (i.Id == 40963)
{
i.Value = BitConverter.GetBytes(image.Height);
}
}

int towidth = 500;
int toheight = 500;
int x = 0;
int y = 0;
int ow = image.Width;
int oh = image.Height;
if (image.Width < 500 )
{
toheight = image.Height;
towidth = image.Width;
}
else
{
towidth = 500;
toheight = image.Height * 500 / image.Width;

}
//rotating(Path);

System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);

g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;              //设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;              //清空画布并以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);              //在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(image, new System.Drawing.Rectangle(0, 0, towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel);

g.DrawImage(copyImage, new System.Drawing.Rectangle(bitmap.Width - 10 - copyImage.Width, bitmap.Height - 8 - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
g.Dispose();

bitmap.Save(Path_syp);
image.Dispose();
}
public bool IsReusable {
get {
return false;
}
}

}