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    <p>Here is an extension method in VB.NET for the Image Class</p> <pre class="lang-vb prettyprint-override"><code>Imports System.Runtime.CompilerServices Namespace Extensions ''' &lt;summary&gt; ''' Extensions for the Image class. ''' &lt;/summary&gt; ''' &lt;remarks&gt;Several usefull extensions for the image class.&lt;/remarks&gt; Public Module ImageExtensions ''' &lt;summary&gt; ''' Extends the image class so that it is easier to get a thumbnail from an image ''' &lt;/summary&gt; ''' &lt;param name="Input"&gt;Th image that is inputted, not really a parameter&lt;/param&gt; ''' &lt;param name="MaximumSize"&gt;The maximumsize the thumbnail must be if keepaspectratio is set to true then the highest number of width or height is used and the other is calculated accordingly. &lt;/param&gt; ''' &lt;param name="KeepAspectRatio"&gt;If set false width and height will be the same else the highest number of width or height is used and the other is calculated accordingly.&lt;/param&gt; ''' &lt;returns&gt;A thumbnail as image.&lt;/returns&gt; ''' &lt;remarks&gt; ''' &lt;example&gt;Can be used as such. ''' &lt;code&gt; ''' Dim _NewImage as Image ''' Dim _Graphics As Graphics ''' _Image = New Bitmap(100, 100) ''' _Graphics = Graphics.FromImage(_Image) ''' _Graphics.FillRectangle(Brushes.Blue, New Rectangle(0, 0, 100, 100)) ''' _Graphics.DrawLine(Pens.Black, 10, 0, 10, 100) ''' Assert.IsNotNull(_Image) ''' _NewImage = _Image.ToThumbnail(10) ''' &lt;/code&gt; ''' &lt;/example&gt; ''' &lt;/remarks&gt; &lt;Extension()&gt; _ Public Function ToThumbnail(ByVal Input As Image, ByVal MaximumSize As Integer, Optional ByVal KeepAspectRatio As Boolean = True) As Image Dim ReturnImage As Image Dim _Callback As Image.GetThumbnailImageAbort = Nothing Dim _OriginalHeight As Double Dim _OriginalWidth As Double Dim _NewHeight As Double Dim _NewWidth As Double Dim _NormalImage As Image Dim _Graphics As Graphics _NormalImage = New Bitmap(Input.Width, Input.Height) _Graphics = Graphics.FromImage(_NormalImage) _Graphics.DrawImage(Input, 0, 0, Input.Width, Input.Height) _OriginalHeight = _NormalImage.Height _OriginalWidth = _NormalImage.Width If KeepAspectRatio = True Then If _OriginalHeight &gt; _OriginalWidth Then If _OriginalHeight &gt; MaximumSize Then _NewHeight = MaximumSize _NewWidth = _OriginalWidth / _OriginalHeight * MaximumSize Else _NewHeight = _OriginalHeight _NewWidth = _OriginalWidth End If Else If _OriginalWidth &gt; MaximumSize Then _NewWidth = MaximumSize _NewHeight = _OriginalHeight / _OriginalWidth * MaximumSize Else _NewHeight = _OriginalHeight _NewWidth = _OriginalWidth End If End If Else _NewHeight = MaximumSize _NewWidth = MaximumSize End If ReturnImage = _ _NormalImage.GetThumbnailImage(Convert.ToInt32(_NewWidth), Convert.ToInt32(_NewHeight), _Callback, _ IntPtr.Zero) _NormalImage.Dispose() _NormalImage = Nothing _Graphics.Dispose() _Graphics = Nothing _Callback = Nothing Return ReturnImage End Function End Module End Namespace </code></pre> <p>Sorry the code tag doesn't like vb.net code.</p>
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    1. POWhat is the "best" way to create a thumbnail using ASP.NET?
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    1. CO"Sorry the code tag doesn't like vb.net code." => I don't blame it :P
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      1. USAlex Nolasco
 

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