如何在C#中引用作用域之外的变量

// 使用闭包引用作用域之外的变量
public class Program
{
    public static void Main(string[] args)
    {
        int externalVariable = 10;

        Action closure = () =>
        {
            int innerVariable = 5;
            int result = externalVariable + innerVariable;
            Console.WriteLine(result);
        };

        closure(); // 输出 15
    }
}

// 通过参数传递引用作用域之外的变量
public class Program
{
    public static void Main(string[] args)
    {
        int externalVariable = 10;

        int result = AddNumbers(externalVariable, 5);
        Console.WriteLine(result); // 输出 15
    }

    public static int AddNumbers(int externalVariable, int innerVariable)
    {
        return externalVariable + innerVariable;
    }
}