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Compress the viewstate Information

, 18 Aug 2013 CPOL 6.6K 12
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How to compress viewstate information of your aspx page

Introduction

This tip discusses how to compress the viewstate information of your aspx page if needed.

Using the Code

  1. Create the following Compressor class in your project.
  2. Override the two methods - LoadPageStateFromPersistenceMedium() and SavePageStateToPersistenceMedium(object viewState) in your cs file.
    // Create the following class file in your project which is used 
    // to compress and decompress the viewstate info  
    
    using System;
    using System.IO;
    using System.IO.Compression;
    
    public static class Compressor
    {
        public static byte[] Compress(byte[] data)
        {
            MemoryStream output = new MemoryStream();
            GZipStream gzip = new GZipStream(output,CompressionMode.Compress, true);
            gzip.Write(data, 0, data.Length);
            gzip.Close();
            return output.ToArray();
        }
    
        public static byte[] Decompress(byte[] data)
        {
            MemoryStream input = new MemoryStream();
            input.Write(data, 0, data.Length);
            input.Position = 0;
            GZipStream gzip = new GZipStream(input,CompressionMode.Decompress, true);
            MemoryStream output = new MemoryStream();
            byte[] buff = new byte[64];
            int read = -1;
            read = gzip.Read(buff, 0, buff.Length);
            while (read > 0)
            {
                output.Write(buff, 0, read);
                read = gzip.Read(buff, 0, buff.Length);
            }
            gzip.Close();
            return output.ToArray();
        }
    
    }
    // Override the two Methods 
       
       protected override object LoadPageStateFromPersistenceMedium()
        {
            string viewState = Request.Form["__VSTATE"];
            byte[] bytes = Convert.FromBase64String(viewState);
            bytes = Compressor.Decompress(bytes);
            LosFormatter formatter = new LosFormatter();
            return formatter.Deserialize(Convert.ToBase64String(bytes));
        }
        protected override void SavePageStateToPersistenceMedium(object viewState)
        {
            LosFormatter formatter = new LosFormatter();
            StringWriter writer = new StringWriter();
            formatter.Serialize(writer, viewState);
            string viewStateString = writer.ToString();
            byte[] bytes = Convert.FromBase64String(viewStateString);
            bytes = Compressor.Compress(bytes);
            ScriptManager.RegisterHiddenField(updPnl, "__VSTATE", Convert.ToBase64String(bytes));
        }

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Poonamchand Soni
Software Developer
India India
No Biography provided

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Comments and Discussions

 
GeneralMy vote of 1 Pin
The Programmer10-Nov-13 21:16
memberThe Programmer10-Nov-13 21:16 
GeneralRe: My vote of 1 Pin
adriancs2-Jun-14 17:34
professionaladriancs2-Jun-14 17:34 
That is also standing on top of other's shoulder...

by Scott Hanselman, March 30, 2005
http://www.hanselman.com/blog/ZippingCompressingViewStateInASPNET.aspx[^]

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