.NET/ASP.NET/C#/VB.NET PDF Document SDK

Second, does the content type require a special feature or module, such as allowing user ratings or comments Because modules tend to affect all nodes of a specific content type, it can sometimes be very difficult to use a module on a specific node Third, how many nodes with the same settings do you require If you need a large number of nodes with the same settings for each, then I highly recommend creating a content type A portfolio is a great example; each portfolio node should have identical functionality, such as images, commenting, and tagging Of course, you could modify one of the core content types to meet your needs, but then you must manually adjust node settings each time you use the content type for something other than a portfolio.

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public static IAsyncResult BeginGetHostEntry( string hostNameOrAddress, AsyncCallback requestCallback, object stateObject )

The same AjaxOptions class applies to this helper and is used in the same way. In this example, the form is appending comments to an element on the page.

Callers may pass a null AsyncCallback. But if they pass a non-null reference, the type implementing the APM is required to invoke the callback once the operation is complete. The AsyncCallback delegate signature requires the callback method to accept an IAsyncResult argument the APM implementation will pass in the same IAsyncRe sult to this completion callback as it returns from the Begin method. This object represents an asynchronous operation in progress many classes can have multiple operations in progress simultaneously, and the IAsyncResult distinguishes between them. Example 16-16 shows one way to use this pattern. It calls the asynchronous BeginGetHostEntry method provided by the Dns class. This looks up the IP address for a computer, so it takes a string the name of the computer to find. And then it takes the two standard final APM arguments a delegate and an object. We can pass anything we like as the object the function we call doesn t actually use it, it just hands it back to us later. We could pass null because our example doesn t need the argument, but we re passing a number just to demonstrate where it comes out. The reason the APM offers this argument is so that if you have multiple simultaneous asynchronous operations in progress at once, you have a convenient way to associate information with each operation. (This mattered much more in older versions of C#, which didn t offer anonymous methods or lambdas back then this argument was the easiest way to pass data into the callback.)

class Program { static void Main(string[] args) { Dns.BeginGetHostEntry("oreilly.com", OnGetHostEntryComplete, 42); } Console.ReadKey();

The using block might look a bit strange to you. It s purely optional, but it does give you the benefit of automatically entering your closing form tag through the magic of the IDisposable interface. You re free to do it the other way, like this:

static void OnGetHostEntryComplete(IAsyncResult iar) { IPHostEntry result = Dns.EndGetHostEntry(iar); Console.WriteLine(result.AddressList[0]);

Fourth, do users need to have a specific role assigned to them to post the node Roles are covered in detail in the next chapter Finally, does the node require a significantly different layout than another content type As discussed in 8, it is much easier to theme the layout for nodes of a specific content type than for individual nodes of single content type Adding a content type is also a matter of preference When you create a content type, it is available on the Add New Content page How many content types do you want on this page Does it make logical sense for you or the client to have three or more content types How would you explain the content type you added to someone who doesn t use the site Knowing when to add a content type takes both experience and foresight.

}

}

The Ajax helpers can quickly give you Ajax behaviors, although they have a couple of drawbacks that are difficult to ignore. First, you can see that even simple examples require many lines of code code that s mixed in with your HTML markup. For more advanced scenarios, you can easily eat up 10 lines or more, which detracts from readability. Second, the JavaScript is hidden from you, so you can t reliably trap errors that occur as a result of your JavaScript handlers. Server errors will be trapped by the OnError handler, and if your OnBegin code throws an error, your Ajax behavior can t be completed. Because of these deficiencies, many choose to write the JavaScript by hand and get more control over the Ajax interaction. The jQuery samples in this chapter should have given you all you need to create the same effect with pure jQuery. That said, the Ajax helpers allow you to get quick Ajax functionality with minimal effort.

Console.WriteLine(iar.AsyncState);