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LINQ provides operators for some common set-based operations. If you have two collections, and you want to discover all the elements that are present in both collections, you can use the Intersect operator:
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var inBoth = set1.Intersect(set2);
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It also offers a Union operator, which provides all the elements from both input sets, but when it comes to the second set it will skip any elements that were already returned because they were also in the first set. So you could think of this as being like Concat,
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except it detects and removes duplicates. In a similar vein, there s the Distinct operator this works on a single collection, rather than a pair of collections. Distinct ensures that it returns any given element only once, so if your input collection happens to contain duplicate entries, Distinct will skip over those. Finally, the Except operator returns only those elements from the first set that do not also appear in the second set.
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LINQ supports joining of sources, in the sense typically associated with databases given two sets of items, you can form a new set by combining the items from each set that have the same value for some attribute. This is a feature that tends not to get a lot of use when working with object models relationships between objects are usually represented with references exposed via properties, so there s not much need for joins. But joins can become much more important if you re using LINQ with data from a relational database. (Although the Entity Framework, which we describe in a later chapter, is often able to represent relationships between tables as object references. It ll use joins at the database level under the covers, but you may not need to use them explicitly in LINQ all that often.) Even though joins are typically most useful when working with data structured for storage in a relational database, you can still perform joins across objects it s possible with LINQ to Objects even if it s not all that common. In our hypothetical calendar application, imagine that you want to add a feature where you can reconcile events in the user s local calendar with events retrieved from his phone s calendar, and you need to try to work out which of the imported events from the phone correspond to items already in the calendar. You might find that the only way to do this is to look for events with the same name that occur at the same time, in which case you might be able to use a join to build up a list of events from the two sources that are logically the same events:
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var pairs = from localEvent in events join phoneEvent in phoneEvents on new { Title = localEvent.Title, Start = localEvent.StartTime } equals new { Title = phoneEvent.Name, Start = phoneEvent.Time } select new { Local = localEvent, Phone = phoneEvent };
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A LINQ join expects to be able to compare just a single object in order to determine whether two items should be joined. But we want to join items only when both the title and the time match. So this example builds an anonymously typed object to hold both values in order to be able to provide LINQ with the single object it expects. (You can use this technique for the grouping operators too, incidentally.) Note that this example also illustrates how you would deal with the relevant properties having different names. You can imagine that the imported phone events might use different property names because you might need to use some third-party import library, so this example shows
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how the code would look if it called the relevant properties Name and Time instead of Title and StartTime. We fix this by mapping the properties from the two sources into anonymous types that have the same structure.
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