C# .Net中的三元运算符和Eval -无法将字符串转换为布尔值

string input = "true";
bool result = (input == "true") ? true : false;

using Microsoft.CSharp;
using System;
using System.CodeDom.Compiler;

public class Program
{
    public static void Main()
    {
        string expression = "2 + 3 * 4";
        int result = Eval(expression);
        Console.WriteLine("Result: " + result);
    }

    public static int Eval(string expression)
    {
        CSharpCodeProvider provider = new CSharpCodeProvider();
        CompilerParameters parameters = new CompilerParameters();
        parameters.GenerateInMemory = true;

        string code = "using System; class Evaluator { public static int Evaluate() { return " + expression + "; } }";
        CompilerResults results = provider.CompileAssemblyFromSource(parameters, code);

        if (results.Errors.HasErrors)
        {
            throw new ArgumentException("Invalid expression");
        }

        Type evaluatorType = results.CompiledAssembly.GetType("Evaluator");
        var method = evaluatorType.GetMethod("Evaluate");
        int result = (int)method.Invoke(null, null);

        return result;
    }
}