如何将System.Windows.Controls.Image 的对象转换为Stream 的对象

[易之盛软件]

如题

我用silverlight做了一个照片上传的工具，想在上传的时候设置照片的最大尺寸，请指教

[freehxx]

设置图片的长宽不行吗？

[易之盛软件]

设置后要转换为Stream，然后保存

[swatsniper1985]

///<summary>
/// 生成缩略图
/// </summary>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
public static Image MakeThubnail(Image image, int width,int height)
{
int desWidth=image.Width;
int desHeight=image.Height;

MemoryStream ms = new MemoryStream();

if (image.Width > width) {
desWidth = width;
desHeight = Convert.ToInt32((image.Height * width) / image.Width);
}

if (desHeight > height) {
desWidth = Convert.ToInt32((desWidth * height) / desHeight);
desHeight = height;
}

Console.WriteLine(desHeight.ToString());
int x = 0;
int y = 0;

int ow = image.Width;
int oh = image.Height;

Image bitmap = new Bitmap(desWidth, desHeight);

Graphics g = Graphics.FromImage(bitmap);

g.InterpolationMode = InterpolationMode.High; //设置高质量插值法

g.SmoothingMode = SmoothingMode.HighQuality; //设置高质量,低速度呈现平滑程度

g.Clear(Color.Transparent); //清空画布并以透明背景色填充

g.DrawImage(image, new Rectangle(0, 0, desWidth, desHeight), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);

bitmap.Save(ms, ImageFormat.Jpeg);

image = Image.FromStream(ms);

return image;

}
最近做项目，自己写的一个方法

[易之盛软件]

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Web;
using System.Web.SessionState;
using System.Web.UI ;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
namespace Exam_C
{
/**//// <summary>
/// 生成缩略图
/// </summary>
/// <param >源图路径（物理路径）</param>
/// <param >缩略图路径（物理路径）</param>
/// <param >缩略图宽度</param>
/// <param >缩略图高度</param>
/// <param >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();
}
}
}



用此方法已经解决

[pp2tt]

我真服了你们了，楼主问的是System.Windows.Controls.Image，你们通通搞System.Drawing.Image，这两个能使用的方法很不同的，试问你们看题目了吗？？？

[北方的星空]

就是服，有没有解决方案吗？