我想实现这样的功能，最好能有关键的代码，高手请进

保存图片myFile.PostedFile.SaveAs(Page.MapPath("upload\\") + myFile.PostedFile.FileName); 生成略说图static public void Save(string NowFullFileName,string SaveFullFileName,int PicWidth,int PicHeight)
{
//从文件取得图片对象
System.Drawing.Image image =new System.Drawing.Bitmap(NowFullFileName);
//取得图片大小
System.Drawing.Size size = new Size(PicWidth , PicHeight);
if (image.Width<size.Width)
{
size.Width=image.Width;
}
if (image.Height<size.Height)
{
size.Height=image.Height;
}
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(size.Width,size.Height);
//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;
//清空一下画布
g.Clear(Color.Blue);
//在指定位置画图
g.DrawImage(image, new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height), 
new System.Drawing.Rectangle(0, 0, image.Width,image.Height),
System.Drawing.GraphicsUnit.Pixel);
//保存高清晰度的缩略图
bitmap.Save(SaveFullFileName, System.Drawing.Imaging.ImageFormat.Jpeg);
image.Dispose();
bitmap.Dispose();

}

解决方案 »

  1.   

    http://xml.sz.luohuedu.net/xml/ShowDetail.asp?id=58EA3515-36F2-4FD9-AC89-EAF49F59816C
      

  2.   

    http://xml.sz.luohuedu.net/xml/ShowDetail.asp?id=45E7E33C-F149-450E-B5D5-832958C20538
      

  3.   

    http://xml.sz.luohuedu.net/xml/ShowDetail.asp?id=45E7E33C-F149-450E-B5D5-832958C20538
     http://xml.sz.luohuedu.net/xml/ShowDetail.asp?id=58EA3515-36F2-4FD9-AC89-EAF49F59816C
      

  4.   

    上传时图片可以改大小，图上写字
     hp.q 发表于 2000-11-23 16:28:36 .NET技术 ←返回版面         [快速返回] <%@ Page Language="c#" Debug="true" Trace="true"%>
    <%@ Import Namespace="System.IO" %>
    <%@ Import Namespace="System.Drawing" %>
    <%@ Import Namespace="System.Drawing.Imaging" %>
    <html>
    <script runat =server>
          void UploadBtn_Click(Object sender, EventArgs e) {
             String filename;
             String filename1;
             String[] filename2;
             int q;
             filename=UploadFile.PostedFile.FileName ;
             filename2=filename.Split(new Char[] {'\\'});
             q=filename2.GetUpperBound(0);
             filename1=filename2[q];
             dis.Text="上传文件名："+filename1+"<br>";
             UploadFile.PostedFile.SaveAs(Server.MapPath(filename1));
             ImageEditor.Visible = true;
             dis.Text+="文件大小："+UploadFile.PostedFile.ContentLength+"字节数";
             Image1.Src=filename1;      
          } 
          void UpdateBtn_Click(Object sender, EventArgs e) {
             String filename1;
             filename1=Image1.Src;
             System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath(filename1));
             System.Drawing.Image newimage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppRGB);
             Graphics g = Graphics.FromImage(newimage);
             g.DrawImage(image,0,0,image.Width,image.Height);
             Font f = new Font(FontType.SelectedItem.Text, Int32.Parse(FontSize.SelectedItem.Text));
             Brush b = new SolidBrush(Color.Red);
             g.DrawString(Caption.Text, f, b, 10, 140);
             g.Dispose();
             System.Drawing.Image thumbImage = newimage.GetThumbnailImage(Int32.Parse(Width.Text),Int32.Parse(Height.Text),null,0);
             image.Dispose();
             thumbImage.Save(Server.MapPath(filename1), ImageFormat.JPEG);
             Image1.Src=filename1;       
             Caption.Text="";     
       
          }   </script>   <body>
       <asp:label id="dis" runat=server/>
         <form enctype="multipart/form-data" runat=server>          <h3>          Select File To Upload: <input id="UploadFile" type=file runat=server>          <asp:button Text="Upload Me!" OnClick="UploadBtn_Click" runat=server/>          <hr>
          
              <asp:panel id="ImageEditor" Visible=false runat=server>             <img ID="Image1" src="" runat="server"/>             <h3>
                    Image Width: <asp:textbox id="Width" runat=server/>                 Image Height: <asp:textbox id="Height" runat=server/> <br>                 Text Caption: <asp:textbox id="Caption" runat=server/>                 Caption Size: <asp:dropdownlist id="FontSize" runat=server>
                                             <asp:listitem>14</asp:listitem>
                                             <asp:listitem>18</asp:listitem>
                                             <asp:listitem>26</asp:listitem>
                                             <asp:listitem>36</asp:listitem>
                                             <asp:listitem>48</asp:listitem>
                                             <asp:listitem>62</asp:listitem>
                                          </asp:dropdownlist>
                     Caption Font: <asp:dropdownlist id="FontType" runat=server>
                                             <asp:listitem>黑体</asp:listitem>
                                             <asp:listitem>仿宋</asp:listitem>
                                             <asp:listitem>隶书</asp:listitem>
                                             <asp:listitem>楷书</asp:listitem>
                                             <asp:listitem>方正姚体</asp:listitem>
                                             <asp:listitem>华文彩云</asp:listitem>
                                          </asp:dropdownlist>
                                                    
                     <asp:button Text="Update Image" OnClick="UpdateBtn_Click" runat=server/>             </h3> 
              </asp:panel>      </form>   </body>
    </html>