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Although object initializers can be used with named classes, their primary use is with anonymous types Therefore, normally, you should explicitly call a constructor when working with named classes
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As explained earlier, you can use into with join to create a group join, which creates a sequence in which each entry in the result consists of an entry from the first sequence and a group of all matching elements from the second sequence No example was presented earlier because often a group join makes use of an anonymous type Now that anonymous types have been covered, an example of a simple group join can be given The following example uses a group join to create a list in which various transports, such as cars, boats, and planes, are organized by their general transportation category, which is land, sea, or air The program first creates a class called Transport that links a transport type with its classification Inside Main( ), it creates two input sequences The first is an array of strings that contains the names of the general means by which one travels: land, sea, and air The second
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is an array of Transport that encapsulates various means of transportation It then uses a group join to produce a list of transports that are organized by their category
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// Demonstrate a simple group join using System; using SystemLinq; // This class links the name of a transport, such as Train, // with its general classification, such as land, sea, or air class Transport { public string Name { get; set; } public string How { get; set; } public Transport(string n, string h) { Name = n; How = h; } } class GroupJoinDemo { static void Main() { // An array of transport classifications string[] travelTypes = { "Air", "Sea", "Land", }; // An array of transports Transport[] transports = { new Transport("Bicycle", "Land"), new Transport("Balloon", "Air"), new Transport("Boat", "Sea"), new Transport("Jet", "Air"), new Transport("Canoe", "Sea"), new Transport("Biplane", "Air"), new Transport("Car", "Land"), new Transport("Cargo Ship", "Sea"), new Transport("Train", "Land") }; // Create a query that uses a group join to produce // a list of item names and IDs organized by category var byHow = from how in travelTypes join trans in transports on how equals transHow into lst select new { How = how, Tlist = lst };
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14: Introducing LINQ
// Execute the query and display the results foreach(var t in byHow) { ConsoleWriteLine("{0} transportation includes:", tHow); foreach(var m in tTlist) ConsoleWriteLine(" " + mName); ConsoleWriteLine(); } } } Air transportation includes: Balloon Jet Biplane Sea transportation includes: Boat Canoe Cargo Ship Land transportation includes: Bicycle Car Train
The key part of the program is, of course, the query, which is shown here:
var byHow = from how in travelTypes join trans in transports on how equals transHow into lst select new { How = how, Tlist = lst };
Here is how it works The from statement uses how to range over the travelTypes array Recall that travelTypes contains an array of the general travel classifications, air, land, and sea The join clause joins each travel type with those transports that use that type For example, the type Land is joined with Bicycle, Car, and Train However, because of the into clause, for each travel type, the join produces a list of the transports that use that type This list is represented by lst Finally, select returns an anonymous type that encapsulates each value of how (the travel type) with a list of transports This is why two foreach loops are needed to display the results of the query The outer loop obtains an object that contains the name of the travel type and a list of the transports for that type The inner loop displays the individual transports
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