在C#20里fileupload控件上传图片后怎么获取图片的长和宽啊

Question

在C#20里fileupload控件上传图片后怎么获取图片的长和宽啊  
 List<Album> album = AlbumBiz.SelectAlbumByUserId(user.User_id);
            //得到完整的文件名
            string filename = this.FileUpload1.PostedFile.FileName;
            //得到扩展名
            string extname = System.IO.Path.GetExtension(filename);
            //3.重新设置一个文件名
            string newname = DateTime.Now.ToString("yyyyMMddHHmmss");
            //随机数
            Random rd = new Random();
            newname = newname + rd.Next(1, 10000).ToString();
            //将相对路径转换为绝对路径(重要)
            string path = Server.MapPath("~/images/");
            //4.真正的上传(必须是绝对路径)
            this.FileUpload1.PostedFile.SaveAs(path + newname + extname);   我想让我上传的 图片 按我想要的大小来  高手帮忙解决一下

Answer 1

建议楼主可以实现一个等比例缩放，参考using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;public partial class UCUploadFiles : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        PicturePath = string.IsNullOrEmpty(Request["picpath"]) ? "" : Request.QueryString["picpath"].ToString();
        PicHeight = string.IsNullOrEmpty(Request.QueryString["height"]) ? 108 : int.Parse(Request.QueryString["height"].ToString());
        PicWidth = string.IsNullOrEmpty(Request.QueryString["width"]) ? 196 : int.Parse(Request.QueryString["width"].ToString());
    }    /// <summary>
    /// 源控件名称
    /// </summary>
    private string picturePath;
    public string PicturePath
    {
        get { return picturePath; }
        set { picturePath = value; }
    }    /// <summary>
    /// 高度
    /// </summary>
    private int picHeight;
    public int PicHeight
    {
        get { return picHeight; }
        set { picHeight = value; }
    }    /// <summary>
    /// 宽度
    /// </summary>
    private int picWidth;
    public int PicWidth
    {
        get { return picWidth; }
        set { picWidth = value; }
    }    protected void Button1_Click(object sender, EventArgs e)
    {
        #region 上传图片到指定路径
        HttpPostedFile postFile = this.FileUpload1.PostedFile;
        string fileType = Path.GetExtension(this.FileUpload1.PostedFile.FileName);
        string uploadPath = System.Configuration.ConfigurationManager.AppSettings["uploadfiles"];// "uploadfiles";//上传图片存放文件夹        string path = System.Configuration.ConfigurationManager.AppSettings["uploadpath"]; //Server.MapPath("~/files/");
        string sServerPath = path;
        path = path + uploadPath;        if (!Directory.Exists(path))
        {
            Directory.CreateDirectory(path);
        }        string fileName = "U";
        fileName += "_";     //分割符；
        fileName += System.DateTime.Now.Year.ToString();
        fileName += System.DateTime.Now.Month.ToString();
        fileName += System.DateTime.Now.Day.ToString();
        fileName += System.DateTime.Now.Hour.ToString();
        fileName += System.DateTime.Now.Minute.ToString();
        fileName += System.DateTime.Now.Second.ToString();
        fileName += fileType;        string sThumbnailFileName = fileName.Substring(0, fileName.IndexOf(fileType) - 1) + "_Thumbnail" + fileType;
        string smallFileName = fileName.Substring(0, fileName.IndexOf(fileType) - 1) + "_small" + fileType;        //model.PhotoPath = "ImageFileUpLoad/" + smallFileName;设置最终保存等比例图片路径到数据库中对应的图片路径字段        string sThumbnailFilePath = path + "\\" + sThumbnailFileName;
        string smallFilePath = path + "\\" + smallFileName;
        string bigFilePath = path + "\\" + fileName;        postFile.SaveAs(bigFilePath);        //按比例制作所略图
        MakeZeroImage(bigFilePath, sThumbnailFilePath);
        //将缩略图与背景图合并
        UnitSmallImageAndBackGround(sThumbnailFilePath, smallFilePath);
        #endregion        setFilePath(smallFileName, picturePath);
    }
    protected void setFilePath(string file_name, string picturePath)
    {
        string strScript;
        string strKey;
        int i;
        //脚本块的内容 
        strScript = "<script language=javascript>\n";
        strScript += "window.alert('上传成功!');";
        strScript += "window.opener.document.form1." + picturePath + ".value='" + file_name + "';";
        strScript += " window.opener.location='default.aspx?picpath=" + file_name + "';";
        strScript += "window.close();";
        strScript += "</script>";
        //reload();
        //注册脚本块的Key 
        strKey = System.DateTime.Now.ToString();
        Page.RegisterClientScriptBlock(strKey, strScript);
    }
    //图片等比缩放处理
    //int PicWidth = 196;
    //int PicHeight = 108;
    private void MakeZeroImage(string sbigFilePath, string sThumbnailFilePath)
    {
        System.Drawing.Image image = System.Drawing.Image.FromFile(sbigFilePath);
        decimal width = Decimal.Parse(image.Width.ToString());
        decimal heght = Decimal.Parse(image.Height.ToString());
        int newwidth, newheight;
        if (width > heght)
        {
            newwidth = picWidth;
            decimal tempwidth = heght / width;
            newheight = Int32.Parse(Math.Round((tempwidth * newwidth), 0).ToString());
        }
        else
        {
            newheight = picHeight;
            decimal tempheight = width / heght;
            newwidth = Int32.Parse(Math.Round((tempheight * newheight), 0).ToString());
        }
        System.Drawing.Image oNewImage = image.GetThumbnailImage(newwidth, newheight, null, IntPtr.Zero);
        image.Dispose();
        oNewImage.Save(sThumbnailFilePath);
        oNewImage.Dispose();
    }
    /// <summary>
    /// 将缩略图与背景图合并
    /// </summary>
    private void UnitSmallImageAndBackGround(string sThumbnailFilePath, string smallFilePath)
    {
        //背景图片
        string bgFileName = Server.MapPath("~/files/uploadfiles/background.jpg");//背景图片地址
        System.Drawing.Image image = System.Drawing.Image.FromFile(bgFileName);
        System.Drawing.Image copyImage = System.Drawing.Image.FromFile(sThumbnailFilePath);        System.Drawing.Image aNewImage;
        Graphics g = Graphics.FromImage(image);
        g.SmoothingMode = SmoothingMode.HighQuality;
        g.InterpolationMode = InterpolationMode.High;
        g.CompositingQuality = CompositingQuality.HighQuality;        g.DrawImage(copyImage, new Rectangle((picWidth - copyImage.Width) / 2, (picHeight - copyImage.Height) / 2, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
        g.Dispose();
        //string finalpicture = GetPicName();
        //string newPath = MapPath(sServerPath) + sFileName;// +finalpicture + ".jpg";
        copyImage.Dispose();        ImageCodecInfo myImageCodecInfo;
        System.Drawing.Imaging.Encoder myEncoder;
        EncoderParameter myEncoderParameter;
        EncoderParameters myEncoderParameters;
        myImageCodecInfo = ImageCodecInfo.GetImageEncoders()[0];
        myEncoder = System.Drawing.Imaging.Encoder.Quality;
        myEncoderParameters = new EncoderParameters(1);
        myEncoderParameter = new EncoderParameter(myEncoder, 100L);   //   0-100   
        myEncoderParameters.Param[0] = myEncoderParameter;
        image.Save(sThumbnailFilePath, myImageCodecInfo, myEncoderParameters);
        myEncoderParameter.Dispose();
        myEncoderParameters.Dispose();
        image.Dispose();        System.Drawing.Image finalImage = System.Drawing.Image.FromFile(sThumbnailFilePath);
        //string smallfile_name = finalpicture + "final.jpg";
        aNewImage = finalImage.GetThumbnailImage(picWidth, picHeight, null, IntPtr.Zero);
        finalImage.Dispose();
        aNewImage.Save(smallFilePath);//, System.Drawing.Imaging.ImageFormat.Jpeg
        aNewImage.Dispose();
        //return smallfile_name;
    }
}

Answer 2

我是把他做成用户控件了，添加了/// <summary>
    /// 高度
    /// </summary>
    private int picHeight;
    public int PicHeight
    {
        get { return picHeight; }
        set { picHeight = value; }
    }    /// <summary>
    /// 宽度
    /// </summary>
    private int picWidth;
    public int PicWidth
    {
        get { return picWidth; }
        set { picWidth = value; }
    }
两个属性值，可自行设定上传图片的高度和宽度

Answer 3

如上传控件为 myup
System.Drawing.Image upimage=System.Drawing.Image.FromStream(Request.Files["myup"].InputStream);
int width = upimage.Width;
int height = upimage.Height;