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You can, of course, construct a new object in the select clause. There s one interesting variation on this that often crops up in LINQ queries, which occurs when you want the query to return multiple pieces of information for each item. For example, we might want to display calendar events in a format where we show both the start and the end times. This is slightly different from how the CalendarEvent class represents things it stores the duration rather than the end time. We could easily write a query that calculates the end time, but it wouldn t be very useful to have just that time. We d want all the details the title, the start time, and the end time. In other words, we d be transforming the data slightly. We d be taking a stream of objects where each item contains Title, StartTime, and Duration properties, and producing one where each item contains a Title, StartTime, and EndTime. Example 8-19 does exactly this.

The first step is to determine what your system needs to know about a purchase order We re going to start out simply, and add information as the chapters go on For now, a purchase order needs the following: Purchase order number Part number Purchased date Expected date Buyer login Buyer name Quantity ordered Was it received Quantity received Date received Also note that the system generates the purchase order number when a new purchase order is entered It s the next number in sequence, but it s a six-character number This chapter is only concerned with adding a purchase order to the database using parameters that are passed into the workflow through the console After considering what information needs to be gathered, you need to create a database Create a database called Purchasing You can accept all defaults for the location and file sizes.

var projected = from ev in events select new { Title = ev.Title, StartTime = ev.StartTime, EndTime = ev.StartTime + ev.Duration };

Take the following steps to secure web traffic on your Apache server with OpenSSL: 1. Install the SSL module for Apache by entering yum install mod_ssl This module will enable Apache to use SSL certificates for encryption. 2. Create an RSA private key file called private.key with this command: openssl genrsa -des3 -out private.key 2048 Provide a passphrase when you are prompted. 3. Generate a sefl-signed certificate file called certificate.pem based on the private.key file just created, using openssl req -new -x509 -key private.key -out certificate.pem -days 1095 Then answer the questions that follow to create the certificate.pem file. 4. Copy the private.key file into the /etc/pki/tls/private directory: cp private.key /etc/pki/tls/private 5. Copy the certificate.pem file into the /etc/pki/tls/certs directory: cp certificate.pem /etc/pki/tls/certs

This constructs a new object for each item. But while the new keyword is there, notice that we ve not specified the name of a type. All we have is the object initialization syntax to populate various properties the list of values in braces after the new keyword. We haven t even defined a type anywhere in these examples that has a Title, a StartTime, and an EndTime property. And yet this compiles. And we can go on to use the results as shown in Example 8-20.

foreach (var item in projected) { Console.WriteLine("Event {0} starts at {1} and ends at {2}", item.Title, item.StartTime, item.EndTime); }

Note: We assume that both the private.key and certificate.pem files are in the current directory, which is

These two examples are using the anonymous type feature added in C# 3.0.

If we want to define a type to represent some information in our application, we would normally use the class or struct keyword as described in 3. Typically, the type definition would live in its own source file, and in a real project we would want to devise unit tests to ensure that it works as expected. This might be enough to put you off the idea of defining a type for use in a very narrow context, such as having a convenient container for the information coming out of a query. But it s often useful for the select clause of a query just to pick out a few properties from the source items, possibly transforming the data in some way to get it into a convenient representation.

Extracting just the properties you need can become important when using LINQ with a database database providers are typically able to transform the projection into an equivalent SQL SELECT statement. But if your LINQ query just fetches the whole row, it will end up fetching every column whether you need it or not, placing an unnecessary extra load on the database and network.