C# Language Compiling Expression Trees

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Example

// Define an expression tree, taking an integer, returning a bool.
Expression<Func<int, bool>> expr = num => num < 5;

// Call the Compile method on the expression tree to return a delegate that can be called.
Func<int, bool> result = expr.Compile();

// Invoke the delegate and write the result to the console.
Console.WriteLine(result(4)); // Prints true

// Prints True.

// You can also combine the compile step with the call/invoke step as below:
Console.WriteLine(expr.Compile()(4));
Create Expression Trees with a lambda expression