Vision Ingenious: Razor View Engine

Vision Ingenious: Razor View Engine: Recently me and my team has been working on has been a new view engine option for ASP.NET MVC4 WEB API, we should work new view engine Raz...

Razor View Engine

Recently me and my team has been working on has been a new view engine option for ASP.NET MVC4 WEB API, we should work new view engine Razor view. It’s new for every one including me. I see the samples; little impressed me I am trying to know about this.

WHAT?

Razor view was released for Microsoft Visual Studio 2010, Razor is a simple-syntax view engine and was released as part of ASP.NET MVC3 and the Microsoft WebMatrix tool set.

Razor is easy to learn and enables you to quickly be productive with a minimum of concepts. You use all your existing language and HTML skills. Razor doesn't require a specific tool and enables you to be productive in any plain old text editor –notepad to edit.

It’s not a new language, Supports "layouts" (an alternative to the "master page" concept in classic aspx pages).

The VS editor will also have the itellesense support that some of the other view engines don't have.

Declarative HTML Helpers also look pretty cool as doing HTML helpers within C# code reminds me of custom controls in ASP.NET. I think they took a page from partials but with the inline code.

HTML Encoding use @ block is automatically HTML encoded to better protect against XSS attack scenarios.

This is just Hello World Sample.

@{var message=”Hello World”;}

I Said : @message

i am try to compare Razor view and ASPX View engines, if may be missing any other point.

RAZOR View Engine	ASPX View Engine
The Razor View Engine is an advanced view engine that was introduced with MVC 3.0. This is not a new language but it is markup.	A web form view engine is the default view engine and available from the beginning of MVC
Razor has a syntax that is very compact and helps us to reduce typing.	The web form view engine has syntax that is the same as an ASP.Net forms application.
The Razor View Engine uses @ to render server-side content.	There is a different syntax ("<%: %>") to make text HTML encoded.
Razor does not require the code block to be closed, the Razor View Engine parses itself and it is able to decide at runtime which is a content element and which is a code element.	A web form View engine does not prevent Cross Site Scripting (XSS) attack.
The Razor Engine supports Test Driven Development (TDD).	Web Form view engine does not support Test Driven Development (TDD) because it depends on the System.Web.UI.Page class to make the testing complex.
There is only three transition characters with the Razor View Engine.	There are only three transition characters with the Razor View Engine.
The Razor View Engine is a bit slower than the ASPX View Engine.

Thanks Guys!! Hope you enjoy.....

Get MD5Hash from FileStream while partially reading

Hello friends,

Recently am worked to CryptoStream using MD5Hash related things and I need to calculate hash of a specified Stream while I was processing its data. I was trying to resolve various solutions and got some samples and customized that and resolve it. Here I will go to describe the difficulty and explanation.

Actually I need to get MD5Hash from filestream while partially reading. Before that we are doing to direct approach.

Along the way I discovered 3 additional methods to calculate hash – all suitable when you can’t rely on seeking in the stream.

Direct Approach for get Hash from container:

                      using (MD5 md5 = System.Security.Cryptography.MD5.Create())

            {

                md5.ComputeHash (inputStraeam);

                String containerHash = BitConverter.ToString(md5.Hash);

                return containerHash;

            }

This is the direct approach to calculate hash from data in stream, but its setback is that after calculating the hash value the stream is read to the end

 If the source stream was seekable (FileStream, MemoryStream…), you can just seek back and process the stream normally, but what if you can’t seek in the processing stream?

The block approach

The block approach you can calculate hash for filestream, using

You can calculate the hash on the go, using TransformBlock and TransformFinalBlock methods of MD5 class.

   using (MD5 md5 = MD5.Create())

        {

          byte[] data = new byte[4096];

          int numRead = 0;

          while ((numRead = inputStream.Read(data, 0, data.length)) > 0)

          {

                           

          md5.TransformBlock(data, 0, numRead, null, 0);

          }

           md5.TransformFinalBlock(data, 0, numRead);

         string fileHash = BitConverter.ToString(md5.Hash);

         fileHash = fileHash.Replace("-", "").ToUpper();

      }

This allows you to calculate the hash of the data at the same time to entire stream.

The block approach with Container position

The block approach with container position you to calculate the hash from set the fileStream position to read and end of stream.

using TransformBlock and TransformFinalBlock methods of MD5 class.

string fileHash = string.Empty;

long totalFileStreamFileStreamSize = fileStreamSize;

byte[] data = new byte[4096];

int readAmount = 0;

 if (fileStreamSize < data.Length)

 {

  readAmount = fileStreamSize;

 }

 else

 {

 readAmount = data.Length;

 }

 using (MD5 md5 = MD5.Create())

 {

 int numRead = 0;

 totalFileStreamFileStreamSize = totalFileStreamFileStreamSize + position;

 while ((numRead = container.Read(data, 0, readAmount)) > 0)

 {

 if ((totalFileStreamFileStreamSize - container.Position) <= readAmount)

 {

 readAmount = (int)(totalFileStreamFileStreamSize - container.Position);

 }

 // Compute MD5 hash

 if (container.Position != totalFileStreamFileStreamSize)

 {

 md5.TransformBlock(data, 0, numRead, null, 0);

 }

 else

 {

 md5.TransformFinalBlock(data, 0, numRead);

 }

 }

 fileHash = BitConverter.ToString(md5.Hash);

 fileHash = fileHash.Replace("-", "").ToUpper();

  }

The CryptoStream Approach

when we want to calculate hash value of output of your algorighm and do not have input in form of a stream, you can use CryptoStreamMode.Write.

using (MD5 md5 = new MD5CryptoServiceProvider())

{

using (CryptoStream writerOutputDocument = new CryptoStream(originalDocument, md5, CryptoStreamMode.Write))

{

while (totalRemaining > 0)

{

int numRead = inputContainer.Read(buffer, 0, readAmount);

if (numRead < 1)

{

throw new Exception("Unexpected end of file readingr.");

}

                                                                    writerOutputDocument.Write(buffer, 0, numRead);

totalRemaining -= numRead;

if (totalRemaining < buffer.Length)

{

 readAmount = (int)totalRemaining;

}

}

}

}

Note – when using CryptoStreamMode.Write, you need to indicate to the hash algorithm that all data is written.