Simple .NET/ASP.NET PDF document editor web control SDK

The decimal type (or System.Decimal, as .NET calls it) is superficially very similar to double and float, except its internal representation is adapted to decimal representations. It can represent up to 28 decimal digits of precision, and unlike the two binary floating-point types, any number that can be written as a 28-digit (or fewer) decimal can be represented completely accurately as a decimal variable. The value 0.1 fits comfortably into 28 digits with room to spare, so this would fix the problem in the previous example. The decimal type still has limited precision; it just has less surprising behavior if you re looking at all your numbers in decimal. So if you are performing calculations involving money, decimal is likely to be a better choice than double or float. The trade-off is that it s slightly less efficient computers are more at home in binary than decimal. For our race information application, we don t have any particular need for decimal fidelity, which is why we re using the double type in Example 2-5. Getting back to that example, recall that we defined three variables that hold the distance our car has traveled, how long it took, and how much fuel it burned in the process. Here it is again so that you don t have to flip back to it:

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static void Main(string[] args) { double kmTravelled = 5.141; double elapsedSeconds = 78.738; double fuelKilosConsumed = 2.7; }

Now that we ve configured IIS to allow ASP.NET to handle requests for the .mvc extension, we can use the MVC application. Our new URL is http://localhost:82/product.mvc/ show/4, which is only a slight cosmetic change from the previous option. Although using the .mvc extension might prevent some users from getting confused between Web Forms .aspx URLs and .mvc URLs, these new URLs still go against normal URL conventions. In normal URL conventions, only query string parameters follow an extension. Instead of using a custom extension, our next option uses a wildcard mapping.

Now that we ve looked at the numeric types, the structure of these lines is pretty clear. We start with the type of data we d like to work with, followed by the name we d like to use, and then we use the = symbol to assign a value to the variable. But assigning constant values isn t very exciting. You can get the computer to do more useful work, because you can assign an expression into a variable.

An expression is a piece of code that produces a value of some kind. We ve actually seen several examples already, the most basic being the numbers we re assigning into the variables. So in our example, a number such as:

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5.141

We won t have to perform any special route configuration for the next two options. In fact, we can deploy the same MVC application to both IIS 7 and IIS 6 and previous versions with the wildcard mapping option. We no longer need an extension in our route configuration, and the URLs used for development will be identical to the URLs used for production on IIS 6. With wildcard mapping, all requests are routed to a single ISAPI filter. We ll configure the aspnet_isapi.dll filter to be this single filter. To create the wildcard mapping, follow these steps:

is an expression. Expressions where we just tell C# what value we want are called literal expressions. More interestingly, expressions can perform calculations. For example, we could calculate the distance traveled per kilogram of fuel consumed with the expression in Example 2-6.

The / symbol denotes division. Multiplication, addition, and subtraction are done with *, +, and -, respectively. You can combine expressions together too. The / operator requires two inputs the dividend and the divisor and each input is itself an expression. We were able to use variable names such as kmTravelled because a variable name is valid as an expression the resultant value is just whatever that variable s value is. But we could use literals, as Example 2-7 shows. (A trap awaits the unwary here; see the sidebar on the next page.)

Create the website with the default configuration. In the Home Directory tab in the Properties dialog box for the website, click Configuration. In the Mappings tab in the Application Configuration dialog box, click Insert. In the Add/Edit Application Extension Mapping dialog box, configure these settings, as shown in figure 6.8: Set the Executable value to the aspnet_isapi.dll path. The path is typically C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll. Use the .NET 2.0 version of the DLL. Uncheck the Verify That File Exists option.

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