Asp. NET create a dynamic thumbnail method

The example in this article describes how asp.net creates dynamic thumbnails. Share to everyone for your reference. The specific analysis is as follows:

Tips:

1. Import System.IO
2. Create Class C Lass "Createthumbnails"
or any class and place following function inside that class

You need one function to response call back to main function

Function Imageabortdummycallback () as Boolean
Return False
End Function

The specific code is as follows:

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Function Createjpegthumbnail (ByVal insourcefile As String, ByVal Indestinationfile as String, ByVal Thumbwidth as Integer , ByVal Thumbheight as Integer) as Boolean Dim imagefile As System.Drawing.Image Dim outputfstream As New FileStream (Insou Rcefile, FileMode.Open, FileAccess.Read) ' exposes a System.IO.Stream around a file, supporting both synchronous and asynch Ronous read and write operations. Dim Imageabortcallback as System.Drawing.Image.GetThumbnailImageAbort ' This method returns true if it decides that the Sys Tem. Drawing.Image.GetThumbnailImage method should prematurely stop execution; Otherwise, it returns false. ImageFile = System.Drawing.Image.FromStream (outputfstream) Imageabortcallback = New System.Drawing.Image.GetThumbnailImageAbort (AddressOf imageabortdummycallback) ImageFile = Imagefile.getthumbnailimage (Thumbwidth, Thumbheight, Imageabortcallback, IntPtr.Zero) ' IntPtr = A platform-specific Type is used to represent a pointer or a handle. Imagefile.save (IndestinatiOnfile, System.Drawing.Imaging.ImageFormat.Jpeg) outputfstream.close () Outputfstream = Nothing ImageFile = no end Function

I hope this article will help you with your asp.net programming.