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I have heard the term expression tree used in the context of lambda expressions What is this An expression tree is a representation of a lambda expression as data Thus, an expression tree, itself, cannot be executed It can, however, be converted into an executable form Expression trees are encapsulated by the SystemLinqExpressionsExpression<T> class Expression trees are useful in situations in which a query will be executed by something outside the program, such as a database that uses SQL By representing the query as data, the query can be converted into a format understood by the database This process is used by the LINQ-to-SQL feature provided by Visual C#, for example Thus, expression trees help C# support a variety of data sources You can obtain an executable form of an expression tree by calling the Compile( ) method defined by Expression It returns a reference that can be assigned to a delegate and then executed Expression trees have one key restriction: Only expression lambdas can be represented by expression trees They cannot be used to represent statement lambdas Although we won t be making explicit use of expression trees in this chapter, they are something that you may find quite interesting
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14: Introducing LINQ
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More Query-Related Extension Methods
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In addition to the methods that correspond to the query keywords, there are several other query-related methods defined for IEnumerable<T> by Enumerable Here is a sampling of several commonly used methods Because many of the methods are overloaded, only their general form is shown
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All(condition) Any(condition) Average( ) Contains(obj) Count( ) First( ) Last( ) Max( ) Min( ) Sum( )
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Returns true if all elements in a sequence satisfy a specified condition Returns true if any element in a sequence satisfies a specified condition Returns the average of the values in a numeric sequence Returns true if the sequence contains the specified object Returns the length of a sequence This is the number of elements that it contains Returns the first element in a sequence Returns the last element in a sequence Returns the maximum value in a sequence Returns the minimum value in a sequence Returns the summation of the values in a numeric sequence
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You have already seen Count( ) in action earlier in this chapter Here is a program that demonstrates the others:
// Use several of the extension methods defined by Enumerable using System; using SystemLinq; class ExtMethods { static void Main() { int[] nums = { 3, 1, 2, 5, 4 };
ConsoleWriteLine("The minimum value is " + numsMin()); ConsoleWriteLine("The maximum value is " + numsMax()); ConsoleWriteLine("The first value is " + numsFirst()); ConsoleWriteLine("The last value is " + numsLast()); ConsoleWriteLine("The sum is " + numsSum()); ConsoleWriteLine("The average is " + numsAverage()); if(numsAll(n => n > 0)) ConsoleWriteLine("All values are greater than zero"); if(numsAny(n => (n % 2) == 0)) ConsoleWriteLine("At least one value is even");
C# 30: A Beginner s Guide
if(numsContains(3)) ConsoleWriteLine("The array contains 3"); } }
The output is shown here:
The minimum value is 1 The maximum value is 5 The first value is 3 The last value is 4 The sum is 15 The average is 3 All values are greater than zero At least one value is even The array contains 3
You can also use these extension methods within a query based on the C# query syntax For example, this program uses Average( ) to obtain a sequence that contains only those values that are less than the average of the values in an array
// Use Average() with the query syntax using System; using SystemLinq; class ExtMethods2 { static void Main() { int[] nums = { 1, 2, 4, 8, 6, 9, 10, 3, 6, 7 };
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