ASP.NET PDF Viewer using C#, VB/NET

If you manage the Drupal web site staging process or a number of Drupal sites, you will eventually encounter the issue of pushing site changes from one site to another. That is, say you have three versions of a single site, all belong to different developers, and a developer makes a change to a view. How do you push the change to this view to all developers without requiring a sync of the databases Generally speaking, Drupal is moving in the direction of creating exportables to solve this problem, in which data files are used to save database changes (views, content types, field changes, and so on). The eventual result is that you can make changes to one site and push changes to another site. Drush EM (http://drupal.org/project/drush_em) helps you in this process. Technically it dumps and updates exportables from modules such as CTools and Views. This allows you to use a versioning system (or rsync) to sync exportables between sites, from which Drush EM can update the database. The process looks like this: 1. 2. 3. 4. 5. Developer A makes changes to a view. Developer A runs the command drush em-dump, dumping the exportable into a module. Developer A commits the module to the repository. Developer B updates their local copy. Developer B runs the command drush em-update, updating the local database to the current view.

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In the case where we re writing, we construct our StreamWriter (in a using block, because we need to Dispose it when we re done), and then use the WriteLine method to

write our content. Remember that WriteLine adds an extra new line on the end of the text, whereas Write just writes the text provided. In the case where we are reading, on the other hand, we construct a StreamReader (also in a using block), and then read the entire content using ReadToEnd. This reads the entire content of the file into a single string. So, if you build and run this once, you ll see some output that looks a lot like this:

Yet they all resolve to different URLs, with a couple of exceptions. Differing URL resolution has the potential to lower search engine results, because many pages point to the same content. With URL rewriting, all the preceding URLs could be redirected to one canonical URL. With URL rewriting, we can not only allow extensionless routes in our MVC application, but set ourselves up for further vital URL rewriting scenarios.

That means we ve run through the write path. Run a second (or subsequent) time, and you ll see something more like this:

Initialized settings at 10:34:47.7014833

Drush Make is one of the most useful modules you will ever encounter. Drush Make allows you to create a single file that is used to download Drupal core and contributed modules into a single directory. That is, you can create a file that lists all required modules, run the Drush Make command, and the site is automatically built. See Figure B-1 for a sample Drush Make file.

When you run this, you ll notice that we end up outputting an extra blank line at the end, because we ve read a whole line from the file we called writer.WriteLine when generating the file and then used Console.WriteLine, which adds another end of line after that. You have to be a little careful when manipulating text like this, to ensure that you don t end up with huge amounts of unwanted whitespace because everyone in some processing chain is generously adding new lines or other whitespace at the end!

Because URL rewriting isn t available for IIS 6 and earlier out of the box, we ll need to use a third-party extension for rewrites. Two popular URL rewrite ISAPI extensions are

This is a rather neat result. We can use all our standard techniques for reading and writing to an IsolatedStorageFileStream once we ve acquired a suitable file: the other I/O types such as StreamReader don t need to know what kind of stream we re using.

So, what makes isolated storage isolated The .NET Framework partitions information written into isolated storage based on some characteristics of the executing code. Several types of isolated store are available to you: Isolation by user and assembly (optionally supporting roaming) Isolation by user, domain, and assembly (optionally supporting roaming) Isolation by user and application (optionally supporting roaming) Isolation by user and site (only on Silverlight) Isolation by machine and assembly Isolation by machine, domain, and assembly Isolation by machine and application

Helicon Tech s ISAPI Rewrite www.isapirewrite.com/ Ionic s ISAPI Rewrite Filter www.codeplex.com/IIRF/

In Example 11-50, we acquired a store isolated by user and assembly, using the static method IsolatedStorageFile.GetUserStoreForAssembly. This store is unique to a particular user, and the assembly in which the calling code is executing. You can try this out for yourself. If you log in to your box as a user other than the one under which you ve already run our example app, and run it again, you ll see some output like this:

That means our settings file doesn t exist (for this user), so we must have been given a new store. As you might expect, the user is identified by the authenticated principal for the current thread. Typically, this is the logged-on user that ran the process; but this could have been changed by impersonation (in a web application, for example, you might be running in the context of the web user, rather than that of the ASP.NET process that hosts the site). Identifying the assembly is slightly more complex. If you have signed the assembly, it uses the information in that signature (be it a strong name signature, or a software publisher signature, with the software publishing signature winning if it has both). If, on the other hand, the assembly is not signed, it will use the URL for the assembly. If it came from the Internet, it will be of the form: