static void Main(string[] args)
{
Func <double, double> lambda = e => e * 2 + 1;
Console.WriteLine(lambda(42.0));
Expression <Func <double, double> > expression = e => e * 2 + 1;
// When we write this, we don't execute. Instead, we parse the expression
Console.WriteLine(expression.ToString( ));
// Using the ExpressionDumper class, we can also look at the structure of
// the expression tree
ExpressionDumper.Output(expression);
Expression <Func <Person, bool> > isCalledBoris = p => p.Name == "Boris";
ExpressionDumper.Output(isCalledBoris);
//return;
// First define the parameter to the expression
ParameterExpression parameterExpression =
Expression.Parameter(typeof(double), "x");
// Now let's perform the operations on the parameter
Expression body = Expression.Add(Expression.Multiply(
parameterExpression, Expression.Constant(2.0)), Expression.Constant(1.0));
// Our lambda expression has a body and one or more parameters
Expression <Func <double, double> > lambdaExpression =
Expression.Lambda <Func <double, double> >(body, parameterExpression);
Console.WriteLine(lambdaExpression.ToString());
// We can compile an expression into a delegate
Func <double, double> function = lambdaExpression.Compile( );
// Which we then call
Console.WriteLine(function(10));
}
