<%
@ Control Language
=
"
C#
"
AutoEventWireup
=
"
true
"
CodeFile
=
"
ImageThumbnail.ascx.cs
"
Inherits
=
"
ImageThumbnail
"
%>
<
asp:Image ID
=
"
Image1
"
runat
=
"
server
"
CssClass
=
"
photo
"
BorderWidth
=
"
1
"
/>
1
using
System;
2
3
public
partial
class
ImageThumbnail : System.Web.UI.UserControl
4
{ 5 public object PhotoID 6 { 7 get 8 { 9 object o = ViewState["PhotoID"];10 return (o != null) ? (int)o : 0;11 }12 set13 {14 ViewState["PhotoID"] = (value != null && value != DBNull.Value) ? Convert.ToInt32(value) : 0;15 }16 }17 public ImageSizes ImageSize18 {19 get20 {21 object o = ViewState["ImageSize"];22 return (o != null) ? (ImageSizes)o : ImageSizes.Thumb;23 }24 set25 {26 ViewState["ImageSize"] = value;27 }28 }29 public enum ImageSizes30 {31 Large = 0,32 Thumb = 1,33 FullSize = 234 }35 public string NoPhotoImg36 {37 get38 {39 object o = ViewState["NoPhotoImg"];40 return (o != null) ? (string)o : null;41 }42 set43 {44 ViewState["NoPhotoImg"] = value;45 }46 }47 protected void Page_PreRender(object sender, System.EventArgs e)48 {49 if (Convert.ToInt32(PhotoID) == 0)50 {51 if (NoPhotoImg != null)52 {53 Image1.ImageUrl = NoPhotoImg;54 }55 else56 {57 Image1.Visible = false;58 }59 }60 else61 {62 Image1.ImageUrl = "ImageFetch.ashx?Size=" + Convert.ToInt32(ImageSize) + "&ImageID=" + Convert.ToString(PhotoID);63 }64 }65 protected void Page_Load(object sender, EventArgs e)66 {6768 }69}
70
ImageFetch.ashx
1
<%
@ WebHandler Language
=
"
C#
"
Class
=
"
ImageFetch
"
%>
2
3
using
System;
4
using
System.Web;
5
using
System.Data.SqlClient;
6
using
System.Data;
7
using
System.IO;
8
9
public
class
ImageFetch : IHttpHandler
10
{11 const int BUFFERSIZE = 1024;1213 public bool IsReusable14 {15 get16 {17 return true;18 }19 }2021 public void ProcessRequest(HttpContext context)22 {23 HttpResponse response = context.Response;24 HttpRequest request = context.Request;25 response.ContentType = "image/jpeg";26 response.Cache.SetCacheability(HttpCacheability.Public);27 response.BufferOutput = false;28 writeSingleImage(Convert.ToInt32(request.QueryString["ImageID"]), Convert.ToInt32(request.QueryString["Size"]), response.OutputStream);29 response.End();30 }3132 public void writeSingleImage(int ImageID, int size, Stream output)33 {34 string cxnstr = System.Configuration.ConfigurationManager.ConnectionStrings["ClubSiteDB"].ConnectionString;35 SqlConnection connection = new SqlConnection(cxnstr);36 string query;37 if (size == 0)38 {39 query = "select largeimage from images where id=@item_id";40 }41 else if (size == 1)42 {43 query = "select thumbimage from images where id=@item_id";44 }45 else if (size == 2)46 {47 query = "select origimage from images where id=@item_id";48 }49 else50 {51 query = "select largeimage from images where id=@item_id";52 }53 SqlCommand command = new SqlCommand(query, connection);54 SqlParameter param0 = new SqlParameter("@item_id", SqlDbType.Int);55 param0.Value = ImageID;56 command.Parameters.Add(param0);57 connection.Open();5859 byte[] d = ((byte[])(command.ExecuteScalar()));60 output.Write(d, 0, d.Length);61 connection.Close();62 }63}
转载于:https://www.cnblogs.com/zwl12549/archive/2007/12/14/995042.html
