C# Online Compiler | .NET Fiddle

<no name> by Anonymous

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

public class Program
{
	public static void Main()
	{
		Expression<Func<Foo, C>> expr = x => x.A.B.C;
		var visitor = new Visitor();
		visitor.Visit(expr);
		visitor.lookup.Dump();
	}
}

public class Visitor : ExpressionVisitor
{
	// Mapping of the latest child -> string
	public readonly Dictionary<Expression, string> lookup = new Dictionary<Expression, string>();
	protected override Expression VisitMember(MemberExpression node)
	{
		var result = base.VisitMember(node);
		Console.WriteLine("Visiting " + node);
		if (lookup.TryGetValue(node.Expression, out var current))
		{
			lookup.Remove(node.Expression);
			current += "." + node.Member.Name;
		}
		else
		{
			current = node.Member.Name;
		}
		lookup[node] = current;
		return result;
	}
}

public class Foo
{
	public A A { get; set; }	
}
public class A 
{
	public B B { get; set; }	
}
public class B
{
	public C C { get; set; }	
}
public class C
{
}

​x
 
using System;
using System.Linq.Expressions;
using System.Collections.Generic;   
​
public class Program
{
    public static void Main()
    {
        Expression<Func<Foo, C>> expr = x => x.A.B.C;
        var visitor = new Visitor();
        visitor.Visit(expr);
        visitor.lookup.Dump();
    }
}
​
public class Visitor : ExpressionVisitor
{
    // Mapping of the latest child -> string
    public readonly Dictionary<Expression, string> lookup = new Dictionary<Expression, string>();
    protected override Expression VisitMember(MemberExpression node)
    {
        var result = base.VisitMember(node);
        Console.WriteLine("Visiting " + node);
        if (lookup.TryGetValue(node.Expression, out var current))
        {
            lookup.Remove(node.Expression);
            current += "." + node.Member.Name;
        }
        else
        {
            current = node.Member.Name;
        }
        lookup[node] = current;
        return result;
    }
}
​
public class Foo
{
    public A A { get; set; }    
}
public class A 
{
    public B B { get; set; }    
}
public class B
{
    public C C { get; set; }    
}
public class C
{
}

System.AggregateException: One or more errors occurred. ---> System.Exception: Exception of type 'System.Exception' was thrown.
   at Program.<ThirdMethod>d__3.MoveNext() in c:\Windows\Temp\mdivxxfz.0.cs:line 19
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Program.<FirstMethod>d__0.MoveNext() in c:\Windows\Temp\mdivxxfz.0.cs:line 8
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Program.Main() in c:\Windows\Temp\mdivxxfz.0.cs:line 25
---> (Inner Exception #0) System.Exception: Exception of type 'System.Exception' was thrown.
   at Program.<ThirdMethod>d__3.MoveNext() in c:\Windows\Temp\mdivxxfz.0.cs:line 19
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Program.<FirstMethod>d__0.MoveNext() in c:\Windows\Temp\mdivxxfz.0.cs:line 8<---

Cached Result
Last Run:	6:23:07 pm
Compile:	0.11s
Execute:	1.021s
Memory:	144kb
CPU:	0s

View IL Code