How to Create or generate thumbnails from images in Asp.Net ~ Asp .Net Solution Kirit Kapupara

Description:-

In this Example we Explain that How to Create or Generate thumbnails from Images in Asp.Net.

First we Understand that what is the Actual meaning of thumbnails image are as follow:

What is Thumbnails:-

THUMBNAIL is a "Small version of a picture" Thumbnail is a one kind of term used by graphic designers and photographers for a small images to representation of a larger image.

The intention behind this is that to manage group of larger images so that people can easily look that images.

In this Examle we Create a one List and that list fetch Images one by one from image folder and store it. After Fetching all images we will assign this list to the DataList control so we can Easily Display Image in proper Layout.

Before Assign List Images to DataList Control we also convert this Image to an Thumbnails Format and store it and assign to DataList control.

to show Example of How to Bind Image in DataList with CRUD operation click here CRUD operation in DataList

to show Example of How to Create a Paging in DataList click here Paging in DataList

To DownLoad this Complete Project Click the Below Download Image

Thumbnailimage.aspx:-

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Thumbnailimage.aspx.cs" Inherits="Thumbnailimage" %>

<title>Generate a Thumbnails of the Images in Asp.Net</title>

</head>

<body>

<div>

<asp:FileUpload ID="fileupload1" runat="server" /><br />

<asp:Button ID="btnadd" runat="server" Text="Upload Image" onclick="btnadd_Click" />

</div>

<div>

<b>List of the thumanails of the Images From Image Folder</b>

</div>

<div>

<asp:DataList ID="datalist" runat="server" RepeatColumns="3" CellPadding="4" ForeColor="#333333">

<asp:Image ID="Image1" ImageUrl='<%# Bind("Name", "~/Images/{0}") %>' runat="server" />

<br />

<asp:HyperLink ID="HyperLink1" Text='<%# Bind("Name") %>' NavigateUrl='<%# Bind("Name", "~/Images/{0}") %>' runat="server"/>

</ItemTemplate>

<ItemStyle BorderColor="Brown" BorderStyle="dotted" BorderWidth="3px" HorizontalAlign="Center"

VerticalAlign="Bottom" BackColor="#EFF3FB" />

</asp:DataList>

</div>

</form>

</body>

</html>

Thumbnailimage.aspx.cs:-

using System.Collections;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.IO;

using System;

public partial class Thumbnailimage : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

BindDataList();

}

protected void BindDataList()

{

DirectoryInfo dir = new DirectoryInfo(MapPath("Images")); //Images is the folder in which all images are Uploaded

FileInfo[] files = dir.GetFiles();

ArrayList listItems = new ArrayList();

foreach (FileInfo info in files)

{

if (!info.ToString().Equals("Thumbs.db"))

listItems.Add(info);

}

datalist.DataSource = listItems;

datalist.DataBind();

}

protected void btnadd_Click(object sender, EventArgs e)

{

string filename = Path.GetFileName(fileupload1.PostedFile.FileName);

string targetPath = Server.MapPath("Images/" + filename); // Uploaded Images in the images folder

Stream strm = fileupload1.PostedFile.InputStream;

var targetFile = targetPath;

//Based on scalefactor image size will vary

GenerateThumbnails(0.07, strm, targetFile);

BindDataList();

}

private void GenerateThumbnails(double scaleFactor, Stream sourcePath, string targetPath)

{

using (var image = Image.FromStream(sourcePath))

{

var newWidth = (int)(image.Width * scaleFactor);

var newHeight = (int)(image.Height * scaleFactor);

var thumbnailImg = new Bitmap(newWidth, newHeight);

var thumbGraph = Graphics.FromImage(thumbnailImg);

thumbGraph.CompositingQuality = CompositingQuality.HighQuality;

thumbGraph.SmoothingMode = SmoothingMode.HighQuality;

thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;

var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);

thumbGraph.DrawImage(image, imageRectangle);

thumbnailImg.Save(targetPath, image.RawFormat);

}

Monday 9 September 2013