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That s a lot better, but we can go further. C# 4.0 adds support for optional arguments methods can specify the default value to be supplied when the caller omits an argument. On its own, that wouldn t help here, because in general, C# does not allow ref arguments to be optional. However, if it has decided to make the ref optional, as it does in interop scenarios, then it also allows the argument itself to be optional as long as a default value is available. And since the Word PIA provides default values for all the arguments in the method we re using here, we can reduce the call to just the code in Example 19-6.

var doc = wordApp.Documents.Open(FileName: fileName, ReadOnly: readOnly);

We ve used named arguments here because the arguments are no longer consecutive we only want to supply the first and third, so we name them to make it clear. Named arguments were discussed in 3.

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As Example 19-6 shows, the support for optional ref arguments fixes many of the problems that motivated the use of dynamic in 18. C# now offers multiple ways to solve some interop problems, but how should you choose Well, dynamic becomes particularly important when type information lets you down sometimes COM automation APIs don t provide enough type information at compile time, leaving you with properties whose type is nothing more informative than object, at which point, dynamic is usually the best bet. But static typing provides IntelliSense, and can offer better compile-time checks. So it s probably best to stick with static typing until you hit a point where that stops working.

Summary

10.2.1. Cross-Site Request Forgery (XSRF)

Sometimes you ll need to use components or APIs that were not designed with .NET in mind. You can use COM components and Win32 DLLs from C# thanks to the .NET Framework s interop services. Visual Studio provides additional support specific to ActiveX controls, making it easy to incorporate these into Windows Forms applications. The world of unmanaged code sometimes requires us to work directly with raw memory in an unsafe fashion, and to enable this, C# offers C-style pointers. We strongly discourage you from using them for anything other than interop.

Listing 7-3 shows the portion of the block description from Listing 7-1 focused on the XML tags for an operation for the RSS block, which you used in a previous example in 3. In particular, you used an operation that was called getItems. All operations must be enclosed within an <operation> tag with the name and callMode attributes. The <description> tag is used when the block is configured in the mashup creator. The <inputs> tag encloses one or more <input> tags for each parameter used by the operation. The <input> tag has attributes for the name of the parameter, if it is required and the type of value it represents; also, enclosed within each <input> are a <description> tag and a <defaultValue> tag. Though not used by the RSS block, the <constraints> tag is another that you should note: use it if an operation needs to be restricted to certain inputs.

The @ prefix can be especially useful for literal file paths. You don t need to escape all those backslashes. So instead of writing "C:\\some\\path" you can write just @"c:\some\path".

So, we know how to initialize literal strings, which is terribly useful; but what about our other data How do we display an Int32 or DateTime or whatever We ve already met one way of converting any object to a string the virtual ToString method, which Example 10-5 uses.

int myValue = 45; string myString = myValue.ToString(); Console.WriteLine(myString);

Recall that a malicious page can cause our user s browser to make a GET or POST HTTP request to our web application, with query parameters or form field values chosen by the author of the malicious page, and that at the same time our user s browser will send along HTTP authentication credentials and/or cookies associated with our user Suppose our web application includes a feature that allows our users to change their profile information, including the password they use to log into our application This feature is implemented as an HTML form like the following (we omit formattingrelated markup in the example): <form method="POST" action="/update_profile"> .. New Password: <input type="password" name="password"> ...

This will produce the output you might expect:

decimal myValue = 45.65M; string myString = myValue.ToString(); Console.WriteLine(myString);

Again, we get the expected output:

45.65

OK, what if we have some decimals in something like an accounting ledger, and we want to format them all to line up properly, with a preceding dollar sign

</form> When this form is submitted, our application (specifically, the code that handles requests for the /update_profile URL) determines the identity of the currently logged-in user based on a session cookie, and then updates the stored password for this user in our database Now suppose that there is a page on a malicious web site that our user is lured into viewing say, http://wwwhackerhomeorg/getfreestuffhtml What if this page contains HTML such as the following <form method="POST" name="evilform" target="hiddenframe" action="https://wwwmywwwservicecom/update_profile"> <input type="hidden" name="password" value="evilhax0r"> </form> <iframe name="hiddenframe" style="display: none"> </iframe> <script> documentevilformsubmit(); </script> If Alice, our unsuspecting user, happens to be logged into our application (ie, her browser has a valid session authentication cookie for wwwmywwwservicecom), and then loads wwwhackerhomeorg/getfreestuffhtml, the following sequence of events takes place: 1.

Well, there s an overload of ToString on each of the numeric types that takes an additional parameter a format string.

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