CヒドイIQueryableは、式樹の神秘的なベールをはがします。

public class MyQueryable<T> : IQueryable<T>
 {
     public IEnumerator<T> GetEnumerator()
     {
         throw new NotImplementedException();
     }
     IEnumerator IEnumerable.GetEnumerator()
     {
         throw new NotImplementedException();
     }
     public Type ElementType
     {
         get { throw new NotImplementedException(); }
     }
     public Expression Expression
     {
         get { throw new NotImplementedException(); }
     }
     public IQueryProvider Provider
     {
         get { throw new NotImplementedException(); }
     }
 }

public class MyQueryProvider : IQueryProvider
{
    public IQueryable<TElement> CreateQuery<TElement>(Expression expression)
    {
        throw new NotImplementedException();
    }
    public IQueryable CreateQuery(Expression expression)
    {
        throw new NotImplementedException();
    }
    public TResult Execute<TResult>(Expression expression)
    {
        throw new NotImplementedException();
    }
    public object Execute(Expression expression)
    {
        throw new NotImplementedException();
    }
}

public class MyQueryProvider : IQueryProvider
    {
        public IQueryable<TElement> CreateQuery<TElement>(Expression expression)
        {
            return new MyQueryable<TElement>(expression);
        }

        public IQueryable CreateQuery(Expression expression)
        {
            throw new NotImplementedException();
        }

        public TResult Execute<TResult>(Expression expression)
        {
            return default(TResult);
        }

        public object Execute(Expression expression)
        {
            return new List<object>();
        } 
    }  
    public class MyQueryable<T> : IQueryable<T>
    {
        public MyQueryable()
        {
            _provider = new MyQueryProvider();
            _expression = Expression.Constant(this);
        }

        public MyQueryable(Expression expression)
        {
            _provider = new MyQueryProvider();
            _expression = expression;
        }
        public Type ElementType
        {
            get { return typeof(T); }
        }

        private Expression _expression;
        public Expression Expression
        {
            get { return _expression; }
        }

        private IQueryProvider _provider;
        public IQueryProvider Provider
        {
            get { return _provider; }
        }

        public IEnumerator GetEnumerator()
        {
            return (Provider.Execute(Expression) as IEnumerable).GetEnumerator();
        }

        IEnumerator<T> IEnumerable<T>.GetEnumerator()
        {
            var result = _provider.Execute<List<T>>(_expression);
            if (result == null)
                yield break;
            foreach (var item in result)
            {
                yield return item;
            }
        }
    }

var aa = new MyQueryable<Student>();
 var bb = aa.Where(t => t.Name == "    ");
 var cc = bb.Where(t => t.Sex == " ");
 var dd = cc.AsEnumerable();
 var ee = cc.ToList(); 

本当に値を取る時は、IQueryProviderのExecuteメソッドを実行します。この方法を呼び出したときに式の数を解析し、取得結果を実行することです。
私達は本当に事実を行うべきExecuteを見ましたが、彼をデフォルトに戻しました。

今は嫌な人がいるかもしれません。具体的にExecuteを実現してください。はい上記の解析式樹を通して、ここでやりたいことを自分でやってもいいです。）
まず簡単のために、集合をデータソースにします。

//  Student  
public static List<Student> StudentArrary = new List<Student>()
{
        new Student(){Name="    ", Age=26, Sex=" ", Address="  "},
        new Student(){Name="  ", Age=23, Sex=" ", Address="  "},
        new Student(){Name=" -  ", Age=25, Sex=" ", Address="  "}
};

次に、Visit Expressition 2を書き換える方法：（以前との違い：現在の目的は、Sqlまたは他のものに再組み立てるのではなく、式樹における表現を取ることです。）

public static void VisitExpression2(Expression expression, ref List<LambdaExpression> lambdaOut)
{
    if (lambdaOut == null)
        lambdaOut = new List<LambdaExpression>();
    switch (expression.NodeType)
    {
        case ExpressionType.Call://    
            MethodCallExpression method = expression as MethodCallExpression;
            Console.WriteLine("   :" + method.Method.Name);
            for (int i = 0; i < method.Arguments.Count; i++)
                VisitExpression2(method.Arguments[i], ref  lambdaOut);
            break;
        case ExpressionType.Lambda://lambda   
            LambdaExpression lambda = expression as LambdaExpression;
            lambdaOut.Add(lambda);
            VisitExpression2(lambda.Body, ref  lambdaOut);
            break;
        case ExpressionType.Equal://    
        case ExpressionType.AndAlso://and    
            BinaryExpression binary = expression as BinaryExpression;
            Console.WriteLine("   :" + expression.NodeType.ToString());
            VisitExpression2(binary.Left, ref  lambdaOut);
            VisitExpression2(binary.Right, ref  lambdaOut);
            break;
        case ExpressionType.Constant://   
            ConstantExpression constant = expression as ConstantExpression;
            Console.WriteLine("   :" + constant.Value.ToString());
            break;
        case ExpressionType.MemberAccess:
            MemberExpression Member = expression as MemberExpression;
            Console.WriteLine("    :{0}，  :{1}", Member.Member.Name, Member.Type.ToString());
            break;
        case ExpressionType.Quote:
            UnaryExpression Unary = expression as UnaryExpression;
            VisitExpression2(Unary.Operand, ref  lambdaOut);
            break;
        default:
            Console.Write("UnKnow");
            break;
    }
}

方法Executeを再実現します。

public TResult Execute<TResult>(Expression expression)
{
    List<LambdaExpression> lambda = null;
    AnalysisExpression.VisitExpression2(expression, ref lambda);//             
    IEnumerable<Student> enumerable = null;
    for (int i = 0; i < lambda.Count; i++)
    {
        // LambdaExpression  Expression<Func<Student, bool>>  
        //    Compile()      
        Func<Student, bool> func = (lambda[i] as Expression<Func<Student, bool>>).Compile(); 
        if (enumerable == null)
            enumerable = Program.StudentArrary.Where(func);//  IEnumerable
        else
            enumerable = enumerable.Where(func);
    }
    dynamic obj = enumerable.ToList();//（  ：           ，       sql       ，    url        。）
    return (TResult)obj;
}

実行プロセス:

個人のIQueryable遅延負荷に対する理解：

Expression<Func<Student, bool>> expression = t => t.Name == "    ";
Func<Student, bool> func = expression.Compile();