Tell you how to compile the expression tree into an executable file.

maxelena74

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Linq.Expressions;

namespace ConsoleApplication1
{

class Program
{
    static void Main()
    {
        // Creating a parameter expression.
        ParameterExpression value = Expression.Parameter(typeof(int), "value");

        // Creating an expression to hold a local variable. 
        ParameterExpression result = Expression.Parameter(typeof(int), "result");

        // Creating a label to jump to from a loop.
        LabelTarget label = Expression.Label(typeof(int));

        // Creating a method body.
        BlockExpression block = Expression.Block(
            // Adding a local variable.
            new\[\] { result },
            // Assigning a constant to a local variable: result = 1
            Expression.Assign(result, Expression.Constant(1)),
            // Adding a loop.
                Expression.Loop(
            // Adding a conditional block into the loop.
                   Expression.IfThenElse(
            // Condition: value > 1
                       Expression.GreaterThan(value, Expression.Constant(1)),
            // If true: result \*= value --
                       Expression.MultiplyAssign(result,
                           Expression.PostDecrementAssign(value)),
            // If false, exit the loop and go to the label.
                       Expression.Break(label, result)
                   ),
            // Label to jump to.
               label
            )
        );

        // Compile and execute an expression tree.
        int factorial = Expression.Lambda<Func<int, int>>(block, value).Compile()(5);
        
        Console.WriteLine(factorial);
        // Prints 120.
        

    }
}

}

Something like that, but simply create an expression tree and compile it into an executable file!

Not Active

maxelena74 wrote:

compile it into an executable file!

Please explain

I know the language. I've read a book. - _Madmatt

maxelena74

I created a tree of expressions. How to get from the executable code. Need just a compiler, rather than Interpreter.