using System;

using System.Collections.Generic;

using System.Text;

using Microsoft.Scripting.Ast;



namespace Samples {

    class CIfThen {

        //Expression.IfThen(MethodInfo, Expression[])

        static public void IfThen1() {

            //<Snippet1>

            // add the following directive to your file

            // using Microsoft.Scripting.Ast;  



            //We'll define a helper lambda to print out some information

            ParameterExpression Text = Expression.Parameter(typeof(string));

            var MyPrint = Expression.Lambda<Action<string>>(

                Expression.Call(

                    null,

                    typeof(Console).GetMethod("WriteLine",new Type[]{typeof(string)}),

                    Text

                ),

                Text

            );



            //This element defines an IfThen expression.

            Expression MyIfThen1 = Expression.IfThen(

                Expression.Constant(true),

                Expression.Invoke(

                    MyPrint,

                    Expression.Constant("Ran 1")

                )

            );



            Expression MyIfThen2 = Expression.IfThen(

                Expression.Constant(false),

                Expression.Invoke(

                    MyPrint,

                    Expression.Constant("Ran 2")

                )

            );



            var MyBlock = Expression.Block(

                MyIfThen1,

                MyIfThen2

            );



            //The end result should be "Ran 1".

            Expression.Lambda<Action>(MyBlock).Compile().Invoke();

            //</Snippet1>

        }





    }

}