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The code example in this topic is an implementation of an expression tree visitor. This class is designed to be inherited to create more specialized classes whose functionality requires traversing, examining or copying an expression tree.
Deferred execution means that the evaluation of an expression is delayed until its realized value is actually required. It greatly improves performance by avoiding unnecessary execution. Immediate execution is the reverse of deferred execution. It forces the LINQ query to execute and gets the result immediately.
Expression trees represent code in a tree-like data structure, where each node is an expression. You can compile and run code represented by expression trees. This enables dynamic modification of executable code, the execution of LINQ queries in various databases, and the creation of dynamic queries.
An expression is a sequence of one or more operands and zero or more operators that can be evaluated to a single value, object, method, or namespace. Expressions can consist of a literal value, a method invocation, an operator and its operands, or a simple name. Simple names can be the name of a variable, type member, method parameter, namespace or type.