急求c#实现图片上传，然后可以截取图片大小，传到数据库，然后显示的效果怎么做呀？有源码可参照吗？？
急求c#实现图片上传，然后可以截取图片大小，传到数据库，然后显示的效果怎么做呀？有源码可参照吗？？谢谢！！ --------------------编程问答-------------------- http://www.cnblogs.com/zhongweiv/archive/2011/11/29/2266544.html
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之前用过这个
后台大概是这样
//获取jquery pass 来的数据
//根据数据模拟结果， 然后绘图
//画一个模板
//然后根据所有的数据 ，来复制原图
//img, new Rectangle(imgx,imgy, width, height),
// new Rectangle(0, 0, copywidth, copyheight), GraphicsUnit.Pixel);
//以上是最关键的8组数据 画板(x,y,width,height) 简称1,2,3,4 , 这是paste的方位和大小
//(x,y,width,height) 5,6,7,8 这是复制原图从方位和大小。
//这些如果有调角度的话都会被影响 ， 必须用sin cos 等等来计算后才dropimage
try
{
Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo("en-US");
Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
context.Response.ContentType = "text/plain";
int ID = Convert.ToInt32(context.Request["ID"]);
decimal imageH = decimal.Parse(context.Request["imageH"]); //image 高 ,
decimal imageW = decimal.Parse(context.Request["imageW"]); //image 宽 ,
decimal angle = decimal.Parse(context.Request["imageRotate"]); //角度
string img_source = context.Request["imageSource"];
decimal imageX = decimal.Parse(context.Request["imageX"]); //image角 和div x 的距离
decimal imageY = decimal.Parse(context.Request["imageY"]); //image角 和div y 的距离
decimal selectorH = decimal.Parse(context.Request["selectorH"]); //框框的高 ,内:画板的高
decimal selectorW = decimal.Parse(context.Request["selectorW"]); //框框的宽 ,内:画板的宽
decimal selectorX = decimal.Parse(context.Request["selectorX"]); //框框 和 div x的距离
decimal selectorY = decimal.Parse(context.Request["selectorY"]); //框框 和 div y的距离
decimal viewPortH = decimal.Parse(context.Request["viewPortH"]); //div 的高
decimal viewPortW = decimal.Parse(context.Request["viewPortW"]); //div 的宽
decimal dwidth = decimal.Parse(context.Request["dwidth"]); //原图的宽
decimal dheight = decimal.Parse(context.Request["dheight"]); //原图的高
int ipos = img_source.LastIndexOf(".");
string nojpg = img_source.Substring(0, ipos - 6);
string jpg = img_source.Substring(ipos);
string newpath = nojpg + ".jpg";
newpath = newpath.Replace("http://www.stooges.com.my", "~");//today
newpath = newpath.Replace("/", "\\");
img_source = img_source.Replace("http://www.stooges.com.my", "~");//today
/*改路径*/
//画板的尺寸
string w = selectorW.ToString();
int finalw = int.Parse(w);
string h = selectorH.ToString();
int finalh = int.Parse(h);
//最终x 1
decimal x = imageX - selectorX;
x = Decimal.Round(x, 0);
string imgx1 = x.ToString();
int imgx = int.Parse(imgx1);
//最终 y 2
decimal y = imageY - selectorY;
y = Decimal.Round(y, 0);
string imgy1 = y.ToString();
int imgy = int.Parse(imgy1);
//最终width 3
imageW = Decimal.Round(imageW, 0);
string width2 = imageW.ToString();
int width = int.Parse(width2);
//最终height 4
imageH = Decimal.Round(imageH, 0);
string height1 = imageH.ToString();
int height = int.Parse(height1);
//copy height 也等于原图的尺寸 7
dheight = Decimal.Round(dheight, 0);
string dheight1 = dheight.ToString();
int copyheight = int.Parse(dheight1);
//copy width 也等于原图的尺寸 8
dwidth = Decimal.Round(dwidth, 0);
string dwidth1 = dwidth.ToString();
int copywidth = int.Parse(dwidth1);
//角度处理
angle = Decimal.Round(angle, 0);
string angle1 = angle.ToString();
int jiaodu = int.Parse(angle1);
if (angle > 0 && angle < 360) //如果有角度的话
{
double radian = jiaodu * Math.PI / 180.0;
double cos = Math.Cos(radian);
double sin = Math.Sin(radian);
//原图的宽和高
//取得新的 3,4
int finalwidth = (int)(Math.Max(Math.Abs(width * cos - height * sin), Math.Abs(width * cos + height * sin)));
int finalheight = (int)(Math.Max(Math.Abs(width * sin - height * cos), Math.Abs(width * sin + height * cos)));
//取得新的 7,8
int finalcopywidth = (int)(Math.Max(Math.Abs(copywidth * cos - copyheight * sin), Math.Abs(copywidth * cos + copyheight * sin)));
int finalcopyheight = (int)(Math.Max(Math.Abs(copywidth * sin - copyheight * cos), Math.Abs(copywidth * sin + copyheight * cos)));
//获取新的 1,2
int finalimgx = imgx - ((finalwidth - width) / 2);
int finalimgy = imgy - ((finalheight - height) / 2);
imgx = finalimgx;
imgy = finalimgy;
width = finalwidth;
height = finalheight;
copywidth = finalcopywidth;
copyheight = finalcopyheight;
}
jiaodu = -jiaodu; //弧度转换要-
Bitmap img = (Bitmap)Bitmap.FromFile(context.Server.MapPath(img_source));
// img = Rotate(img, jiaodu);
//调整原图角度来复制
jiaodu = jiaodu % 360;
double radian1 = jiaodu * Math.PI / 180.0;
double cos1 = Math.Cos(radian1);
double sin1 = Math.Sin(radian1);
//原图的宽和高
int w1 = img.Width;
int h1 = img.Height;
int W = (int)(Math.Max(Math.Abs(w1 * cos1 - h1 * sin1), Math.Abs(w1 * cos1 + h1 * sin1)));
int H = (int)(Math.Max(Math.Abs(w1 * sin1 - h1 * cos1), Math.Abs(w1 * sin1 + h1 * cos1)));
//目标位图
Bitmap dsImage = new Bitmap(W, H);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//计算偏移量
Point Offset = new Point((W - w1) / 2, (H - h1) / 2);
//构造图像显示区域：让图像的中心与窗口的中心点一致
Rectangle rect = new Rectangle(Offset.X, Offset.Y, w1, h1);
Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);
g.TranslateTransform(center.X, center.Y);
g.RotateTransform(360 - jiaodu);
//恢复图像在水平和垂直方向的平移
g.TranslateTransform(-center.X, -center.Y);
g.DrawImage(img, rect);
//重至绘图的所有变换
g.ResetTransform();
g.Save();
g.Dispose();
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(finalw, finalh);
//新建一个画板
Graphics g2 = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g2.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g2.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
g2.Clear(Color.White);
//在指定位置并且按指定大小绘制原图片的指定部分
g2.DrawImage(dsImage, new Rectangle(imgx, imgy, width, height),// x,y ,最终的宽,高
new Rectangle(0, 0, copywidth, copyheight), GraphicsUnit.Pixel);
System.Drawing.Imaging.ImageCodecInfo encoder = GetEncoderInfo("image/jpeg");//keatkeat
System.Drawing.Imaging.EncoderParameters encoderParams =
new System.Drawing.Imaging.EncoderParameters(1);
//System.Drawing.Imaging.Encoder 对象封装一个全局唯一标识符 (GUID)，它标识图像编码器参数的类别。
//设置 jpeg 质量为 60，注意应该为 long 类型 /*质量90*/
encoderParams.Param[0] =
new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)90);
bitmap.Save(context.Server.MapPath(newpath), encoder, encoderParams);
dsImage.Dispose();
g.Dispose();
bitmap.Dispose();
img.Dispose();
g2.Dispose();
newpath = newpath.Replace("\\", "/");
newpath = newpath.Replace("~", "http://www.stooges.com.my");//today
context.Response.Write(newpath);
}
catch (Exception ex)
{
string a = ex.Message;
}
private System.Drawing.Imaging.ImageCodecInfo GetEncoderInfo(string mimeType)
/*用于压图片*/
{
try
{
System.Drawing.Imaging.ImageCodecInfo result = null;
//检索已安装的图像编码解码器的相关信息。
System.Drawing.Imaging.ImageCodecInfo[] encoders =
System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
for (int i = 0; i < encoders.Length; i++)
{
if (encoders[i].MimeType == mimeType)
{
result = encoders[i];
break;
}
}
return result;
}
catch (Exception ex)
{
throw ex;
}
}
前台是个plug in 可以剪图 和 旋转 ，然后传值去后台(尺寸角度等等)，后台根据前台传来的值来剪和旋转等等，然后在保存新的一张图 。
这是我几个月前学习的时候做过的。不过现在是直接在前台剪了用 canvas 生产再直接上传，后台就保存图片即可，只是怕旧的游览器不兼容罢了。有需要才找我拿吧
补充：.NET技术 , ASP.NET
