Previously, the thumbnail on the page must be used to use a third party component. Now, with .NET, thumbnails can be easily implemented. Below is an example of achieving thumbnails. ToThumbnailImage.aspx <% @ Page language = "c #" Codebehind = "ToThumbnailImage.aspx.cs" Src = "ToThumbnailImage.aspx.cs" AutoEventWireup = "false" Inherits = "Exam_C.ToThumbnailImage"%>
Lion Interactive Network => Generates Thumbnail </ Title> </ head> <body> <form id = "form1" method = "post" runat = "server"> </ form> </ body> </ HTML></p>
<p>ToThumbnailImage.aspx.cs using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System. Web.ui.WebControls; using system.web.ui.htmlcontrols; using system.drawing.imaging; Namespace Exam_c {/// <summary> /// TothumbnailImage s summary description.</p>
<p>/// </ summary> public class tothumbnailimage: system.Web.ui.page {/ * create by lion 2003-05-20 19:00 Copyright (c) 2004 www.lionsky.net. All Rights Reserved. Web: http : //www.lionsky.net; email: lion-a@sohu.com * / static hashtable htmimes = new hashtable (); Internal readonly string allowext = ".jpe | .jpeg | .jpg | .png | .tif | .tiff | .bmp "; #Region Web Form Designer Generated Code Override Protected Void OnInit (Eventargs E) {#Region Htmimes [". JPE "] =" Image / JPEG "; htmimes [" jpeg "] = "image / jpeg"; htmimes ["jpg"] = "image / jpeg"; htmimes ["png"] = "image / png"; htmimes [". TIF"] = "image / TIFF"; htmimes [ ".tiff"] = "image / TIFF"; htmimes ["bmp"] = "image / bmp"; #ENDREGON / / Call generation thumbnailiMages ("lionsky.jpg", "B.GIF", 300 );} #Endregion #Region helper /// <summary> /// Get all related information of the image codec /// </ summary> /// <param name = "mimetype"> contains more encoded decoders Utilized Internet Snap Extension Protocol (MIME) Type String </ param> /// <returns> Returns all related information of the image codec </ returns> static imagecodecinfo getcodecinfo (string mimetype) {IMA geCodecInfo [] CodecInfo = ImageCodecInfo.GetImageEncoders (); foreach (ImageCodecInfo ici in CodecInfo) {if (ici.MimeType == mimeType) return ici;} return null; effective extension /// detecting} /// <summary> Sex /// </ summary> /// <param name = "sext"> file name extension </ param> /// <returns> Returns true if the extension is valid, otherwise returning false. </ Returns> bool Checkvalidext (string sext) {bool flag = false; string [] axt = allowext.split ('|');</p>
<p>Foreach (String FileType IN AEXT) {IF (FileType.tolower () == Sext) {Flag = true; Break;}} Return Flag;} /// <summary> /// Save Picture /// </ summary> /// <param name = "image"> image object </ param> /// <param name = "savepath"> save path </ param> /// <param name = "ici"> specified format codec parameters </ param> void SaveImage (System.Drawing.Image image, string savePath, ImageCodecInfo ici) {// set EncoderParameters objects EncoderParameters parameters object original image = new EncoderParameters (1); parameters.Param [0] = new EncoderParameter ( Encoder.quality, ((long) 90)); Image.Save (SavePath, ICI, Parameters); parameters.dispose ();} #endregion #region methods /// <summary> /// generated thumbnail ///// </ summary> /// <param name = "SourceImagePath> Original image path (relative path) </ param> /// <param name =" thumbnailimagePath "> The thumbnail path is saved as the original image path (relative path) </ param> /// <param name = "thumbnailImageWidth"> thumbnail width (height ratio automatically generated by the source picture) </ param> public void ToThumbnailImages (string sourceImagePath, string thumbnailImagePath, int thumbnailimageWidth) {s tring SourceImagePath = sourceImagePath; string ThumbnailImagePath = thumbnailImagePath; int ThumbnailImageWidth = thumbnailImageWidth;. string sExt = SourceImagePath.Substring ( "." SourceImagePath.LastIndexOf ()) ToLower (); if (SourceImagePath.ToString () == System.String.Empty ) throw new NullReferenceException ( "SourceImagePath is null!");! if (CheckValidExt (sExt)) {throw new ArgumentException ( "the original image file format is incorrect, the supported formats are [" AllowExt "]", "SourceImagePath" );</p></div><div class="text-center mt-3 text-grey">
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