c# - 创建可用作函数/方法的类型

Question

我一直在玩 LINQ to Z3 来娱乐(不是生产用途)。

我最终以这个语法作为开始:

var i = 123;
var test2 = from t in TheormProver.NewTheorm()
            let f = TheormProver.Func<int, bool>()
            let a = TheormProver.Int
            let g = TheormProver.Func<bool, int>()
            where !f(a * 2) && g(f(g(f(4)))) == i * a && a < g(f(a))
            select new { f = f.ToString(), g = g.ToString(), a, asd = "Test extra property" };

var solution = test2.Solve(); // Edited in for clarification
// note that test2 is a TheormProver<T> which has a "T Solve()" method defined.

静态 TheromProver.Int 和 TheormProver.Func 方法/属性当前仅返回基本类型(根据其名称)。

接下来，我想创建一种 Variable<T> 类型，它包含的信息不仅仅是一个值。

TL;DR:我遇到的问题是我希望 f 和 g 变量成为可以添加字段和属性的自定义类型，但是我仍然希望能够通过 where 子句中的语法来使用它们(即作为方法/Func )。

那么，如何创建可在方法语法中使用的自定义类型，同时添加/拥有自己的属性？

请注意，我不在乎调用该方法是否不执行任何操作，或者不起作用，因为我将操纵 where 子句，以便它们永远不会被调用/执行。

---

示例:

var test2 = from t in TheormProver.NewTheorm()
            let f = TheormProver.Func<int, bool>()
            let a = TheormProver.Int
            where !f(a * 2) && a > 3 // f is used to create a method call expression
            select new { f , a };

var testSolution = test2.Solve();

var fSolution = testSolution.f; // F is its own type with unique properties/fields.

var fConstraints = fSolution.Constraints;

var fSomeProperty = fSolution.SomeProperty;

foreach(var constraint in fConstraints)
{
    //.....
}

我已经模拟了迄今为止正在进行的语法的快速示例:

http://liveworkspace.org/code/3Fm6JM$0

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

namespace ConsoleApplication1
{
    class TheormProver
    {
        public static int Int { get { return default(int); } } // Really this would return my Variable<int>
        public static Func<T, TResult> Func<T, TResult>() { return default(Func<T, TResult>); } // Really this would return my Variable<Func<T, TResult>>

        protected List<Expression> Constraints; // Holds constraints / where clauses that get translated into the Z3 language

        //This gets called when we do the first "let" and gets us into the correctly typed world with a generic parameter
        public virtual TheormProver<T> Select<T>(Func<TheormProver, T> sel)
        {
            return new TheormProver<T>(Constraints);
        }
    }

    // This is what the user of the library sees and is returned by a from t in new TheormProver(). T will be the anonymous type from the last let
    class TheormProver<T> : TheormProver
    {
        public TheormProver(List<Expression> Constraints)
        {

        }

        // This gets called on subsequent "let"s, going from the anonymous type with one property "f" to one with 2, "f, g". Chaining this way allows as many lets as we want
        public virtual TheormProver<U> Select<U>(Expression<Func<T, U>> sel)
        {
            return new TheormProver<T, U>(sel, Constraints.ToList());
        }

        public virtual TheormProver<T> Where(Expression<Func<T, bool>> constraint)
        {
            var result = (TheormProver<T>)this; // This should be a clone to allow composable queries

            result.Constraints.Add(constraint);

            return result;
        }

        public virtual T Solve(out bool foundSolution)
        {
            // TODO: Call Z3 and get a solution
            foundSolution = false;
            return default(T);
        }
    }

    internal class TheormProver<T, U> : TheormProver<U>
    {
        private LambdaExpression Selector;
        private TheormProver<T> InternalTheorumProver;

        public TheormProver(Expression<Func<T, U>> selector, List<Expression> constraints)
            : base(constraints)
        {
            Selector = selector;
            InternalTheorumProver = new TheormProver<T>(constraints);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var test = from t in new TheormProver()
                       let f = TheormProver.Func<int, bool>()
                       let g = TheormProver.Func<bool, int>()
                       let a = TheormProver.Int
                       where g(f(a)) == 0
                       select new { f, g, a };

            bool foundSolution;
            var testSolution = test.Solve(out foundSolution);
        }
    }
}

Answer 1

我为您的原始代码创建了一个简单的“测试床”:http://liveworkspace.org/code/3Bl7wC$0 .

通过一点动态魔法，您可以使用以下类作为 Func<T1, T2> 的直接替代品:

public class MyCallable<T1, T2> : DynamicObject
{
    private readonly Expression<Func<T1, T2> > _wrapped;
    private readonly Func<T1, T2> _compiled;

    public MyCallable(Expression<Func<T1, T2>> towrap) 
    { 
        _wrapped = towrap; _compiled = _wrapped.Compile(); 
    }

    public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)
    {
        if ( (args.Length == 1) && 
             (args[0].GetType() == typeof(T1)))
        {
            Console.WriteLine(@"Invoking ""{0}"" on {1}", _wrapped, args[0]);
            result = _compiled((T1) args[0]);
            return true;
        }
        else
        {
            //throw new ArgumentException("Cannot invoke " + _wrapped + " with the arguments passed");
            result = null;
            return false;
        }
    }
}

如您所见，它将您的类定义为“动态”，并允许您尝试调用它，就好像它是委托(delegate)/函数/...一般可调用:

// in "TheormProver"
public static dynamic Func<T1, T2>() { return new MyCallable<T1, T2>(arg1 => default(T2)); }

这是它有效的证明: http://liveworkspace.org/code/4kBypd$0

输出:

Invoking "arg1 => False" on 0
Invoking "arg1 => False" on 4
Invoking "arg1 => 0" on False
Invoking "arg1 => False" on 0
Invoking "arg1 => 0" on False
Invoking "arg1 => False" on 0
Invoking "arg1 => 0" on False

完整代码供引用:

using System;
using System.Linq;
using System.Linq.Expressions;
using System.Dynamic;

public class Program
{
    public class MyCallable<T1, T2> : DynamicObject
    {
        private readonly Expression<Func<T1, T2> > _wrapped;
        private readonly Func<T1, T2> _compiled;

        public MyCallable(Expression<Func<T1, T2>> towrap) 
        { 
            _wrapped = towrap; _compiled = _wrapped.Compile(); 
        }

        public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)
        {
            if ( (args.Length == 1) && 
                 (args[0].GetType() == typeof(T1)))
            {
                Console.WriteLine(@"Invoking ""{0}"" on {1}", _wrapped, args[0]);
                result = _compiled((T1) args[0]);
                return true;
            }
            else
            {
                //throw new ArgumentException("Cannot invoke " + _wrapped + " with the arguments passed");
                result = null;
                return false;
            }
        }
    }

    public static class TheormProver
    {
        public static object[] NewTheorm() { return new object[] { 1 }; }
        public static dynamic Func<T1, T2>() { return new MyCallable<T1, T2>(arg1 => default(T2)); }
        public static int Int { get; set; }
    }

    public static void Main(string[] args)
    {
        var i = 123;
        var test2 = from t in TheormProver.NewTheorm()
            let f = TheormProver.Func<int, bool>()
            let a = TheormProver.Int
            let g = TheormProver.Func<bool, int>()
            where !f(a * 2) && g(f(g(f(4)))) == i * a && a < g(f(a))
            select new { f = f.ToString(), g = g.ToString(), a, asd = "Test extra property" };

        test2.ToList().ForEach(Console.WriteLine);
    }

}