LambdaVisitor.cs

using System.Linq.Expressions;

namespace ExpressionVisitor;

public class LambdaVisitor : Visitor
{
    private readonly LambdaExpression node;
    public LambdaVisitor(LambdaExpression node) : base(node) => this.node = node;

    public override void Visit(string prefix)
    {
        Console.WriteLine($"{prefix}This expression is a {NodeType} expression type");
        Console.WriteLine($"{prefix}The name of the lambda is {(node.Name ?? "<null>")}");
        Console.WriteLine($"{prefix}The return type is {node.ReturnType}");
        Console.WriteLine($"{prefix}The expression has {node.Parameters.Count} arguments. They are:");
        foreach (var argumentExpression in node.Parameters)
        {
            var argumentVisitor = CreateFromExpression(argumentExpression);
            argumentVisitor.Visit(prefix + "\t");
        }
        Console.WriteLine($"{prefix}The expression body is:");
        var bodyVisitor = CreateFromExpression(node.Body);
        bodyVisitor.Visit(prefix + "\t");
    }
}