MethodCallVisitor.cs

using System.Linq.Expressions;

namespace ExpressionVisitor;

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

    public override void Visit(string prefix)
    {
        Console.WriteLine($"{prefix}This expression is a {NodeType} expression");
        if (node.Object == null)
        {
            Console.WriteLine($"{prefix}This is a static method call");
        }
        else
        {
            Console.WriteLine($"{prefix}The receiver (this) is:");
            var receiverVisitor = CreateFromExpression(node.Object);
            receiverVisitor.Visit(prefix + "\t");
        }

        var methodInfo = node.Method;
        Console.WriteLine($"{prefix}The method name is {methodInfo.DeclaringType}.{methodInfo.Name}");
        Console.WriteLine($"{prefix}The return type is {methodInfo.ReturnType}");
        // There is more here, like generic arguments, and so on.
        Console.WriteLine($"{prefix}The Arguments are:");
        foreach (var arg in node.Arguments)
        {
            var argVisitor = CreateFromExpression(arg);
            argVisitor.Visit(prefix + "\t");
        }
    }
}