为地区上传缩略图的代码！
本人菜鸟 在试着做一个修改页面，其中有上传缩略图这个功能，但代码不会写！求高手赐教 --------------------编程问答-------------------- 上传图片，生成缩略图fileuploadImage.GetThumbnailImage 方法：返回此 Image 的缩略图。
public Image GetThumbnailImage(
int thumbWidth,
int thumbHeight,
Image..::.GetThumbnailImageAbort callback,
IntPtr callbackData
)
Image thumbImg = Image.FromFile("").GetThumbnailImage(100, 120, null, new IntPtr()); --------------------编程问答-------------------- 不错 我也不会正好用到 --------------------编程问答--------------------
Image img = Image.FromFile(path);--------------------编程问答--------------------
Bitmap bitmap = new Bitmap(100,100);
graphics g = graphics.fromimage(bitmap);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.Clear(Color.Transparent);
g.drawimage(img,new rectangle(0,0,100,100),new rectangle(0,0,img.width,img.height))
bitmap.save(newpat,imageformat.jpeg)
/**//**//// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
Image originalImage = Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case "HW"://指定高宽缩放（可能变形）
break;
case "W"://指定宽，高按比例
toheight = originalImage.Height * width/originalImage.Width;
break;
case "H"://指定高，宽按比例
towidth = originalImage.Width * height/originalImage.Height;
break;
case "Cut"://指定高宽裁减（不变形）
if((double)originalImage.Width/(double)originalImage.Height > (double)towidth/(double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height*towidth/toheight;
y = 0;
x = (originalImage.Width - ow)/2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width*height/towidth;
x = 0;
y = (originalImage.Height - oh)/2;
}
break;
default :
break;
}
//新建一个bmp图片
Image bitmap = new System.Drawing.Bitmap(towidth,toheight);
//新建一个画板
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(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(originalImage, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow,oh),
GraphicsUnit.Pixel);
try
{
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch(System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
我一直用的这个 --------------------编程问答--------------------
我的textbox ID是tbimage 上传的按钮是默认id 请高手帮我写详细点好吗 帮帮忙 急用！ --------------------编程问答-------------------- 按钮事件应该写什么代码？ --------------------编程问答-------------------- --------------------编程问答--------------------
补充：.NET技术 , ASP.NET
