ExpressionVisitor.cs source code in C# .NET

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Code:

/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataWeb / Client / System / Data / Services / Client / ALinq / ExpressionVisitor.cs / 1 / ExpressionVisitor.cs

                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
//      Expression Visitor
//  
// 
// @owner  [....]
//--------------------------------------------------------------------- 

#if ASTORIA_SERVER
namespace System.Data.Services
#else 
namespace System.Data.Services.Client
#endif 
{ 
    using System;
    using System.Collections.Generic; 
    using System.Collections.ObjectModel;
    using System.Linq.Expressions;

    ///  
    /// base vistor class for walking an expression tree bottom up.
    ///  
    internal abstract class ExpressionVisitor 
    {
        ///  
        /// Main visit method for ExpressionVisitor
        /// 
        /// The expression to visit
        /// The visited expression  
        internal virtual Expression Visit(Expression exp)
        { 
            if (exp == null) 
            {
                return exp; 
            }

            switch (exp.NodeType)
            { 
                case ExpressionType.UnaryPlus:
                case ExpressionType.Negate: 
                case ExpressionType.NegateChecked: 
                case ExpressionType.Not:
                case ExpressionType.Convert: 
                case ExpressionType.ConvertChecked:
                case ExpressionType.ArrayLength:
                case ExpressionType.Quote:
                case ExpressionType.TypeAs: 
                    return this.VisitUnary((UnaryExpression)exp);
                case ExpressionType.Add: 
                case ExpressionType.AddChecked: 
                case ExpressionType.Subtract:
                case ExpressionType.SubtractChecked: 
                case ExpressionType.Multiply:
                case ExpressionType.MultiplyChecked:
                case ExpressionType.Divide:
                case ExpressionType.Modulo: 
#if !ASTORIA_CLIENT
                case ExpressionType.Power: 
#endif 
                case ExpressionType.And:
                case ExpressionType.AndAlso: 
                case ExpressionType.Or:
                case ExpressionType.OrElse:
                case ExpressionType.LessThan:
                case ExpressionType.LessThanOrEqual: 
                case ExpressionType.GreaterThan:
                case ExpressionType.GreaterThanOrEqual: 
                case ExpressionType.Equal: 
                case ExpressionType.NotEqual:
                case ExpressionType.Coalesce: 
                case ExpressionType.ArrayIndex:
                case ExpressionType.RightShift:
                case ExpressionType.LeftShift:
                case ExpressionType.ExclusiveOr: 
                    return this.VisitBinary((BinaryExpression)exp);
                case ExpressionType.TypeIs: 
                    return this.VisitTypeIs((TypeBinaryExpression)exp); 
                case ExpressionType.Conditional:
                    return this.VisitConditional((ConditionalExpression)exp); 
                case ExpressionType.Constant:
                    return this.VisitConstant((ConstantExpression)exp);
                case ExpressionType.Parameter:
                    return this.VisitParameter((ParameterExpression)exp); 
                case ExpressionType.MemberAccess:
                    return this.VisitMemberAccess((MemberExpression)exp); 
                case ExpressionType.Call: 
                    return this.VisitMethodCall((MethodCallExpression)exp);
                case ExpressionType.Lambda: 
                    return this.VisitLambda((LambdaExpression)exp);
                case ExpressionType.New:
                    return this.VisitNew((NewExpression)exp);
                case ExpressionType.NewArrayInit: 
                case ExpressionType.NewArrayBounds:
                    return this.VisitNewArray((NewArrayExpression)exp); 
                case ExpressionType.Invoke: 
                    return this.VisitInvocation((InvocationExpression)exp);
                case ExpressionType.MemberInit: 
                    return this.VisitMemberInit((MemberInitExpression)exp);
                case ExpressionType.ListInit:
                    return this.VisitListInit((ListInitExpression)exp);
                default: 
                    throw new NotSupportedException(Strings.ALinq_UnsupportedExpression(exp.NodeType.ToString()));
            } 
        } 

        ///  
        /// MemberBinding visit method
        /// 
        /// The MemberBinding expression to visit
        /// The visited MemberBinding expression  
        internal virtual MemberBinding VisitBinding(MemberBinding binding)
        { 
            switch (binding.BindingType) 
            {
                case MemberBindingType.Assignment: 
                    return this.VisitMemberAssignment((MemberAssignment)binding);
                case MemberBindingType.MemberBinding:
                    return this.VisitMemberMemberBinding((MemberMemberBinding)binding);
                case MemberBindingType.ListBinding: 
                    return this.VisitMemberListBinding((MemberListBinding)binding);
                default: 
                    throw new NotSupportedException(Strings.ALinq_UnsupportedExpression(binding.BindingType.ToString())); 
            }
        } 

        /// 
        /// ElementInit visit method
        ///  
        /// The ElementInit expression to visit
        /// The visited ElementInit expression  
        internal virtual ElementInit VisitElementInitializer(ElementInit initializer) 
        {
            ReadOnlyCollection arguments = this.VisitExpressionList(initializer.Arguments); 
            if (arguments != initializer.Arguments)
            {
                return Expression.ElementInit(initializer.AddMethod, arguments);
            } 

            return initializer; 
        } 

        ///  
        /// UnaryExpression visit method
        /// 
        /// The UnaryExpression expression to visit
        /// The visited UnaryExpression expression  
        internal virtual Expression VisitUnary(UnaryExpression u)
        { 
            Expression operand = this.Visit(u.Operand); 
            if (operand != u.Operand)
            { 
                return Expression.MakeUnary(u.NodeType, operand, u.Type, u.Method);
            }

            return u; 
        }
 
        ///  
        /// BinaryExpression visit method
        ///  
        /// The BinaryExpression expression to visit
        /// The visited BinaryExpression expression 
        internal virtual Expression VisitBinary(BinaryExpression b)
        { 
            Expression left = this.Visit(b.Left);
            Expression right = this.Visit(b.Right); 
            Expression conversion = this.Visit(b.Conversion); 
            if (left != b.Left || right != b.Right || conversion != b.Conversion)
            { 
                if (b.NodeType == ExpressionType.Coalesce && b.Conversion != null)
                {
                    return Expression.Coalesce(left, right, conversion as LambdaExpression);
                } 
                else
                { 
                    return Expression.MakeBinary(b.NodeType, left, right, b.IsLiftedToNull, b.Method); 
                }
            } 

            return b;
        }
 
        /// 
        /// TypeBinaryExpression visit method 
        ///  
        /// The TypeBinaryExpression expression to visit
        /// The visited TypeBinaryExpression expression  
        internal virtual Expression VisitTypeIs(TypeBinaryExpression b)
        {
            Expression expr = this.Visit(b.Expression);
            if (expr != b.Expression) 
            {
                return Expression.TypeIs(expr, b.TypeOperand); 
            } 

            return b; 
        }

        /// 
        /// ConstantExpression visit method 
        /// 
        /// The ConstantExpression expression to visit 
        /// The visited ConstantExpression expression  
        internal virtual Expression VisitConstant(ConstantExpression c)
        { 
            return c;
        }

        ///  
        /// ConditionalExpression visit method
        ///  
        /// The ConditionalExpression expression to visit 
        /// The visited ConditionalExpression expression 
        internal virtual Expression VisitConditional(ConditionalExpression c) 
        {
            Expression test = this.Visit(c.Test);
            Expression iftrue = this.Visit(c.IfTrue);
            Expression iffalse = this.Visit(c.IfFalse); 
            if (test != c.Test || iftrue != c.IfTrue || iffalse != c.IfFalse)
            { 
                return Expression.Condition(test, iftrue, iffalse); 
            }
 
            return c;
        }

        ///  
        /// ParameterExpression visit method
        ///  
        /// The ParameterExpression expression to visit 
        /// The visited ParameterExpression expression 
        internal virtual Expression VisitParameter(ParameterExpression p) 
        {
            return p;
        }
 
        /// 
        /// MemberExpression visit method 
        ///  
        /// The MemberExpression expression to visit
        /// The visited MemberExpression expression  
        internal virtual Expression VisitMemberAccess(MemberExpression m)
        {
            Expression exp = this.Visit(m.Expression);
            if (exp != m.Expression) 
            {
                return Expression.MakeMemberAccess(exp, m.Member); 
            } 

            return m; 
        }

        /// 
        /// MethodCallExpression visit method 
        /// 
        /// The MethodCallExpression expression to visit 
        /// The visited MethodCallExpression expression  
        internal virtual Expression VisitMethodCall(MethodCallExpression m)
        { 
            Expression obj = this.Visit(m.Object);
            IEnumerable args = this.VisitExpressionList(m.Arguments);
            if (obj != m.Object || args != m.Arguments)
            { 
                return Expression.Call(obj, m.Method, args);
            } 
 
            return m;
        } 

        /// 
        /// Expression list visit method
        ///  
        /// The expression list to visit
        /// The visited expression list 
        internal virtual ReadOnlyCollection VisitExpressionList(ReadOnlyCollection original) 
        {
            List list = null; 
            for (int i = 0, n = original.Count; i < n; i++)
            {
                Expression p = this.Visit(original[i]);
                if (list != null) 
                {
                    list.Add(p); 
                } 
                else if (p != original[i])
                { 
                    list = new List(n);
                    for (int j = 0; j < i; j++)
                    {
                        list.Add(original[j]); 
                    }
 
                    list.Add(p); 
                }
            } 

            if (list != null)
            {
                return new ReadOnlyCollection(list); 
            }
 
            return original; 
        }
 
        /// 
        /// MemberAssignment visit method
        /// 
        /// The MemberAssignment to visit 
        /// The visited MemberAssignmentt
        internal virtual MemberAssignment VisitMemberAssignment(MemberAssignment assignment) 
        { 
            Expression e = this.Visit(assignment.Expression);
            if (e != assignment.Expression) 
            {
                return Expression.Bind(assignment.Member, e);
            }
 
            return assignment;
        } 
 
        /// 
        /// MemberMemberBinding visit method 
        /// 
        /// The MemberMemberBinding to visit
        /// The visited MemberMemberBinding
        internal virtual MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding binding) 
        {
            IEnumerable bindings = this.VisitBindingList(binding.Bindings); 
            if (bindings != binding.Bindings) 
            {
                return Expression.MemberBind(binding.Member, bindings); 
            }

            return binding;
        } 

        ///  
        /// MemberListBinding visit method 
        /// 
        /// The MemberListBinding to visit 
        /// The visited MemberListBinding
        internal virtual MemberListBinding VisitMemberListBinding(MemberListBinding binding)
        {
            IEnumerable initializers = this.VisitElementInitializerList(binding.Initializers); 
            if (initializers != binding.Initializers)
            { 
                return Expression.ListBind(binding.Member, initializers); 
            }
 
            return binding;
        }

        ///  
        /// Binding List visit method
        ///  
        /// The Binding list to visit 
        /// The visited Binding list
        internal virtual IEnumerable VisitBindingList(ReadOnlyCollection original) 
        {
            List list = null;
            for (int i = 0, n = original.Count; i < n; i++)
            { 
                MemberBinding b = this.VisitBinding(original[i]);
                if (list != null) 
                { 
                    list.Add(b);
                } 
                else if (b != original[i])
                {
                    list = new List(n);
                    for (int j = 0; j < i; j++) 
                    {
                        list.Add(original[j]); 
                    } 

                    list.Add(b); 
                }
            }

            if (list != null) 
            {
                return list; 
            } 

            return original; 
        }

        /// 
        /// ElementInit expression list visit method 
        /// 
        /// The ElementInit expression list  to visit 
        /// The visited ElementInit expression list  
        internal virtual IEnumerable VisitElementInitializerList(ReadOnlyCollection original)
        { 
            List list = null;
            for (int i = 0, n = original.Count; i < n; i++)
            {
                ElementInit init = this.VisitElementInitializer(original[i]); 
                if (list != null)
                { 
                    list.Add(init); 
                }
                else if (init != original[i]) 
                {
                    list = new List(n);
                    for (int j = 0; j < i; j++)
                    { 
                        list.Add(original[j]);
                    } 
 
                    list.Add(init);
                } 
            }

            if (list != null)
            { 
                return list;
            } 
 
            return original;
        } 

        /// 
        /// LambdaExpression visit method
        ///  
        /// The LambdaExpression to visit
        /// The visited LambdaExpression 
        internal virtual Expression VisitLambda(LambdaExpression lambda) 
        {
            Expression body = this.Visit(lambda.Body); 
            if (body != lambda.Body)
            {
                return Expression.Lambda(lambda.Type, body, lambda.Parameters);
            } 

            return lambda; 
        } 

        ///  
        /// NewExpression visit method
        /// 
        /// The NewExpression to visit
        /// The visited NewExpression 
        internal virtual NewExpression VisitNew(NewExpression nex)
        { 
            IEnumerable args = this.VisitExpressionList(nex.Arguments); 
            if (args != nex.Arguments)
            { 
                if (nex.Members != null)
                {
                    return Expression.New(nex.Constructor, args, nex.Members);
                } 
                else
                { 
                    return Expression.New(nex.Constructor, args); 
                }
            } 

            return nex;
        }
 
        /// 
        /// MemberInitExpression visit method 
        ///  
        /// The MemberInitExpression to visit
        /// The visited MemberInitExpression 
        internal virtual Expression VisitMemberInit(MemberInitExpression init)
        {
            NewExpression n = this.VisitNew(init.NewExpression);
            IEnumerable bindings = this.VisitBindingList(init.Bindings); 
            if (n != init.NewExpression || bindings != init.Bindings)
            { 
                return Expression.MemberInit(n, bindings); 
            }
 
            return init;
        }

        ///  
        /// ListInitExpression visit method
        ///  
        /// The ListInitExpression to visit 
        /// The visited ListInitExpression
        internal virtual Expression VisitListInit(ListInitExpression init) 
        {
            NewExpression n = this.VisitNew(init.NewExpression);
            IEnumerable initializers = this.VisitElementInitializerList(init.Initializers);
            if (n != init.NewExpression || initializers != init.Initializers) 
            {
                return Expression.ListInit(n, initializers); 
            } 

            return init; 
        }

        /// 
        /// NewArrayExpression visit method 
        /// 
        /// The NewArrayExpression to visit 
        /// The visited NewArrayExpression 
        internal virtual Expression VisitNewArray(NewArrayExpression na)
        { 
            IEnumerable exprs = this.VisitExpressionList(na.Expressions);
            if (exprs != na.Expressions)
            {
                if (na.NodeType == ExpressionType.NewArrayInit) 
                {
                    return Expression.NewArrayInit(na.Type.GetElementType(), exprs); 
                } 
                else
                { 
                    return Expression.NewArrayBounds(na.Type.GetElementType(), exprs);
                }
            }
 
            return na;
        } 
 
        /// 
        /// InvocationExpression visit method 
        /// 
        /// The InvocationExpression to visit
        /// The visited InvocationExpression
        internal virtual Expression VisitInvocation(InvocationExpression iv) 
        {
            IEnumerable args = this.VisitExpressionList(iv.Arguments); 
            Expression expr = this.Visit(iv.Expression); 
            if (args != iv.Arguments || expr != iv.Expression)
            { 
                return Expression.Invoke(expr, args);
            }

            return iv; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
//      Expression Visitor
//  
// 
// @owner  [....]
//--------------------------------------------------------------------- 

#if ASTORIA_SERVER
namespace System.Data.Services
#else 
namespace System.Data.Services.Client
#endif 
{ 
    using System;
    using System.Collections.Generic; 
    using System.Collections.ObjectModel;
    using System.Linq.Expressions;

    ///  
    /// base vistor class for walking an expression tree bottom up.
    ///  
    internal abstract class ExpressionVisitor 
    {
        ///  
        /// Main visit method for ExpressionVisitor
        /// 
        /// The expression to visit
        /// The visited expression  
        internal virtual Expression Visit(Expression exp)
        { 
            if (exp == null) 
            {
                return exp; 
            }

            switch (exp.NodeType)
            { 
                case ExpressionType.UnaryPlus:
                case ExpressionType.Negate: 
                case ExpressionType.NegateChecked: 
                case ExpressionType.Not:
                case ExpressionType.Convert: 
                case ExpressionType.ConvertChecked:
                case ExpressionType.ArrayLength:
                case ExpressionType.Quote:
                case ExpressionType.TypeAs: 
                    return this.VisitUnary((UnaryExpression)exp);
                case ExpressionType.Add: 
                case ExpressionType.AddChecked: 
                case ExpressionType.Subtract:
                case ExpressionType.SubtractChecked: 
                case ExpressionType.Multiply:
                case ExpressionType.MultiplyChecked:
                case ExpressionType.Divide:
                case ExpressionType.Modulo: 
#if !ASTORIA_CLIENT
                case ExpressionType.Power: 
#endif 
                case ExpressionType.And:
                case ExpressionType.AndAlso: 
                case ExpressionType.Or:
                case ExpressionType.OrElse:
                case ExpressionType.LessThan:
                case ExpressionType.LessThanOrEqual: 
                case ExpressionType.GreaterThan:
                case ExpressionType.GreaterThanOrEqual: 
                case ExpressionType.Equal: 
                case ExpressionType.NotEqual:
                case ExpressionType.Coalesce: 
                case ExpressionType.ArrayIndex:
                case ExpressionType.RightShift:
                case ExpressionType.LeftShift:
                case ExpressionType.ExclusiveOr: 
                    return this.VisitBinary((BinaryExpression)exp);
                case ExpressionType.TypeIs: 
                    return this.VisitTypeIs((TypeBinaryExpression)exp); 
                case ExpressionType.Conditional:
                    return this.VisitConditional((ConditionalExpression)exp); 
                case ExpressionType.Constant:
                    return this.VisitConstant((ConstantExpression)exp);
                case ExpressionType.Parameter:
                    return this.VisitParameter((ParameterExpression)exp); 
                case ExpressionType.MemberAccess:
                    return this.VisitMemberAccess((MemberExpression)exp); 
                case ExpressionType.Call: 
                    return this.VisitMethodCall((MethodCallExpression)exp);
                case ExpressionType.Lambda: 
                    return this.VisitLambda((LambdaExpression)exp);
                case ExpressionType.New:
                    return this.VisitNew((NewExpression)exp);
                case ExpressionType.NewArrayInit: 
                case ExpressionType.NewArrayBounds:
                    return this.VisitNewArray((NewArrayExpression)exp); 
                case ExpressionType.Invoke: 
                    return this.VisitInvocation((InvocationExpression)exp);
                case ExpressionType.MemberInit: 
                    return this.VisitMemberInit((MemberInitExpression)exp);
                case ExpressionType.ListInit:
                    return this.VisitListInit((ListInitExpression)exp);
                default: 
                    throw new NotSupportedException(Strings.ALinq_UnsupportedExpression(exp.NodeType.ToString()));
            } 
        } 

        ///  
        /// MemberBinding visit method
        /// 
        /// The MemberBinding expression to visit
        /// The visited MemberBinding expression  
        internal virtual MemberBinding VisitBinding(MemberBinding binding)
        { 
            switch (binding.BindingType) 
            {
                case MemberBindingType.Assignment: 
                    return this.VisitMemberAssignment((MemberAssignment)binding);
                case MemberBindingType.MemberBinding:
                    return this.VisitMemberMemberBinding((MemberMemberBinding)binding);
                case MemberBindingType.ListBinding: 
                    return this.VisitMemberListBinding((MemberListBinding)binding);
                default: 
                    throw new NotSupportedException(Strings.ALinq_UnsupportedExpression(binding.BindingType.ToString())); 
            }
        } 

        /// 
        /// ElementInit visit method
        ///  
        /// The ElementInit expression to visit
        /// The visited ElementInit expression  
        internal virtual ElementInit VisitElementInitializer(ElementInit initializer) 
        {
            ReadOnlyCollection arguments = this.VisitExpressionList(initializer.Arguments); 
            if (arguments != initializer.Arguments)
            {
                return Expression.ElementInit(initializer.AddMethod, arguments);
            } 

            return initializer; 
        } 

        ///  
        /// UnaryExpression visit method
        /// 
        /// The UnaryExpression expression to visit
        /// The visited UnaryExpression expression  
        internal virtual Expression VisitUnary(UnaryExpression u)
        { 
            Expression operand = this.Visit(u.Operand); 
            if (operand != u.Operand)
            { 
                return Expression.MakeUnary(u.NodeType, operand, u.Type, u.Method);
            }

            return u; 
        }
 
        ///  
        /// BinaryExpression visit method
        ///  
        /// The BinaryExpression expression to visit
        /// The visited BinaryExpression expression 
        internal virtual Expression VisitBinary(BinaryExpression b)
        { 
            Expression left = this.Visit(b.Left);
            Expression right = this.Visit(b.Right); 
            Expression conversion = this.Visit(b.Conversion); 
            if (left != b.Left || right != b.Right || conversion != b.Conversion)
            { 
                if (b.NodeType == ExpressionType.Coalesce && b.Conversion != null)
                {
                    return Expression.Coalesce(left, right, conversion as LambdaExpression);
                } 
                else
                { 
                    return Expression.MakeBinary(b.NodeType, left, right, b.IsLiftedToNull, b.Method); 
                }
            } 

            return b;
        }
 
        /// 
        /// TypeBinaryExpression visit method 
        ///  
        /// The TypeBinaryExpression expression to visit
        /// The visited TypeBinaryExpression expression  
        internal virtual Expression VisitTypeIs(TypeBinaryExpression b)
        {
            Expression expr = this.Visit(b.Expression);
            if (expr != b.Expression) 
            {
                return Expression.TypeIs(expr, b.TypeOperand); 
            } 

            return b; 
        }

        /// 
        /// ConstantExpression visit method 
        /// 
        /// The ConstantExpression expression to visit 
        /// The visited ConstantExpression expression  
        internal virtual Expression VisitConstant(ConstantExpression c)
        { 
            return c;
        }

        ///  
        /// ConditionalExpression visit method
        ///  
        /// The ConditionalExpression expression to visit 
        /// The visited ConditionalExpression expression 
        internal virtual Expression VisitConditional(ConditionalExpression c) 
        {
            Expression test = this.Visit(c.Test);
            Expression iftrue = this.Visit(c.IfTrue);
            Expression iffalse = this.Visit(c.IfFalse); 
            if (test != c.Test || iftrue != c.IfTrue || iffalse != c.IfFalse)
            { 
                return Expression.Condition(test, iftrue, iffalse); 
            }
 
            return c;
        }

        ///  
        /// ParameterExpression visit method
        ///  
        /// The ParameterExpression expression to visit 
        /// The visited ParameterExpression expression 
        internal virtual Expression VisitParameter(ParameterExpression p) 
        {
            return p;
        }
 
        /// 
        /// MemberExpression visit method 
        ///  
        /// The MemberExpression expression to visit
        /// The visited MemberExpression expression  
        internal virtual Expression VisitMemberAccess(MemberExpression m)
        {
            Expression exp = this.Visit(m.Expression);
            if (exp != m.Expression) 
            {
                return Expression.MakeMemberAccess(exp, m.Member); 
            } 

            return m; 
        }

        /// 
        /// MethodCallExpression visit method 
        /// 
        /// The MethodCallExpression expression to visit 
        /// The visited MethodCallExpression expression  
        internal virtual Expression VisitMethodCall(MethodCallExpression m)
        { 
            Expression obj = this.Visit(m.Object);
            IEnumerable args = this.VisitExpressionList(m.Arguments);
            if (obj != m.Object || args != m.Arguments)
            { 
                return Expression.Call(obj, m.Method, args);
            } 
 
            return m;
        } 

        /// 
        /// Expression list visit method
        ///  
        /// The expression list to visit
        /// The visited expression list 
        internal virtual ReadOnlyCollection VisitExpressionList(ReadOnlyCollection original) 
        {
            List list = null; 
            for (int i = 0, n = original.Count; i < n; i++)
            {
                Expression p = this.Visit(original[i]);
                if (list != null) 
                {
                    list.Add(p); 
                } 
                else if (p != original[i])
                { 
                    list = new List(n);
                    for (int j = 0; j < i; j++)
                    {
                        list.Add(original[j]); 
                    }
 
                    list.Add(p); 
                }
            } 

            if (list != null)
            {
                return new ReadOnlyCollection(list); 
            }
 
            return original; 
        }
 
        /// 
        /// MemberAssignment visit method
        /// 
        /// The MemberAssignment to visit 
        /// The visited MemberAssignmentt
        internal virtual MemberAssignment VisitMemberAssignment(MemberAssignment assignment) 
        { 
            Expression e = this.Visit(assignment.Expression);
            if (e != assignment.Expression) 
            {
                return Expression.Bind(assignment.Member, e);
            }
 
            return assignment;
        } 
 
        /// 
        /// MemberMemberBinding visit method 
        /// 
        /// The MemberMemberBinding to visit
        /// The visited MemberMemberBinding
        internal virtual MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding binding) 
        {
            IEnumerable bindings = this.VisitBindingList(binding.Bindings); 
            if (bindings != binding.Bindings) 
            {
                return Expression.MemberBind(binding.Member, bindings); 
            }

            return binding;
        } 

        ///  
        /// MemberListBinding visit method 
        /// 
        /// The MemberListBinding to visit 
        /// The visited MemberListBinding
        internal virtual MemberListBinding VisitMemberListBinding(MemberListBinding binding)
        {
            IEnumerable initializers = this.VisitElementInitializerList(binding.Initializers); 
            if (initializers != binding.Initializers)
            { 
                return Expression.ListBind(binding.Member, initializers); 
            }
 
            return binding;
        }

        ///  
        /// Binding List visit method
        ///  
        /// The Binding list to visit 
        /// The visited Binding list
        internal virtual IEnumerable VisitBindingList(ReadOnlyCollection original) 
        {
            List list = null;
            for (int i = 0, n = original.Count; i < n; i++)
            { 
                MemberBinding b = this.VisitBinding(original[i]);
                if (list != null) 
                { 
                    list.Add(b);
                } 
                else if (b != original[i])
                {
                    list = new List(n);
                    for (int j = 0; j < i; j++) 
                    {
                        list.Add(original[j]); 
                    } 

                    list.Add(b); 
                }
            }

            if (list != null) 
            {
                return list; 
            } 

            return original; 
        }

        /// 
        /// ElementInit expression list visit method 
        /// 
        /// The ElementInit expression list  to visit 
        /// The visited ElementInit expression list  
        internal virtual IEnumerable VisitElementInitializerList(ReadOnlyCollection original)
        { 
            List list = null;
            for (int i = 0, n = original.Count; i < n; i++)
            {
                ElementInit init = this.VisitElementInitializer(original[i]); 
                if (list != null)
                { 
                    list.Add(init); 
                }
                else if (init != original[i]) 
                {
                    list = new List(n);
                    for (int j = 0; j < i; j++)
                    { 
                        list.Add(original[j]);
                    } 
 
                    list.Add(init);
                } 
            }

            if (list != null)
            { 
                return list;
            } 
 
            return original;
        } 

        /// 
        /// LambdaExpression visit method
        ///  
        /// The LambdaExpression to visit
        /// The visited LambdaExpression 
        internal virtual Expression VisitLambda(LambdaExpression lambda) 
        {
            Expression body = this.Visit(lambda.Body); 
            if (body != lambda.Body)
            {
                return Expression.Lambda(lambda.Type, body, lambda.Parameters);
            } 

            return lambda; 
        } 

        ///  
        /// NewExpression visit method
        /// 
        /// The NewExpression to visit
        /// The visited NewExpression 
        internal virtual NewExpression VisitNew(NewExpression nex)
        { 
            IEnumerable args = this.VisitExpressionList(nex.Arguments); 
            if (args != nex.Arguments)
            { 
                if (nex.Members != null)
                {
                    return Expression.New(nex.Constructor, args, nex.Members);
                } 
                else
                { 
                    return Expression.New(nex.Constructor, args); 
                }
            } 

            return nex;
        }
 
        /// 
        /// MemberInitExpression visit method 
        ///  
        /// The MemberInitExpression to visit
        /// The visited MemberInitExpression 
        internal virtual Expression VisitMemberInit(MemberInitExpression init)
        {
            NewExpression n = this.VisitNew(init.NewExpression);
            IEnumerable bindings = this.VisitBindingList(init.Bindings); 
            if (n != init.NewExpression || bindings != init.Bindings)
            { 
                return Expression.MemberInit(n, bindings); 
            }
 
            return init;
        }

        ///  
        /// ListInitExpression visit method
        ///  
        /// The ListInitExpression to visit 
        /// The visited ListInitExpression
        internal virtual Expression VisitListInit(ListInitExpression init) 
        {
            NewExpression n = this.VisitNew(init.NewExpression);
            IEnumerable initializers = this.VisitElementInitializerList(init.Initializers);
            if (n != init.NewExpression || initializers != init.Initializers) 
            {
                return Expression.ListInit(n, initializers); 
            } 

            return init; 
        }

        /// 
        /// NewArrayExpression visit method 
        /// 
        /// The NewArrayExpression to visit 
        /// The visited NewArrayExpression 
        internal virtual Expression VisitNewArray(NewArrayExpression na)
        { 
            IEnumerable exprs = this.VisitExpressionList(na.Expressions);
            if (exprs != na.Expressions)
            {
                if (na.NodeType == ExpressionType.NewArrayInit) 
                {
                    return Expression.NewArrayInit(na.Type.GetElementType(), exprs); 
                } 
                else
                { 
                    return Expression.NewArrayBounds(na.Type.GetElementType(), exprs);
                }
            }
 
            return na;
        } 
 
        /// 
        /// InvocationExpression visit method 
        /// 
        /// The InvocationExpression to visit
        /// The visited InvocationExpression
        internal virtual Expression VisitInvocation(InvocationExpression iv) 
        {
            IEnumerable args = this.VisitExpressionList(iv.Arguments); 
            Expression expr = this.Visit(iv.Expression); 
            if (args != iv.Arguments || expr != iv.Expression)
            { 
                return Expression.Invoke(expr, args);
            }

            return iv; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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