C#代码中如何替代goto语句？新手编程技术求助

云原生阿岚

2026-8-15

移除goto语句的重构方案

要替换代码里的goto，最直观的方式是用外层do-while循环来控制是否重新进入分类输入流程，这样逻辑更清晰，也符合结构化编程的规范。

核心思路：用一个布尔变量标记是否需要重试输入，当用户选择“N”时把标记设为true，触发循环再次执行；处理完“Y”的逻辑后标记设为false，直接退出循环。

重构后的完整代码：

bool shouldRetry;
do
{
    shouldRetry = false; // 默认不重试

    Console.WriteLine("New category");
    Console.WriteLine("***************************");
    Console.WriteLine();

    Console.Write("Name: ");
    string categoryName = Console.ReadLine();

    Console.WriteLine("Is this correct? (Y)es (N)o");

    Category category = new Category(categoryName);

    ConsoleKeyInfo userInput;
    bool invalidSelection;
    do
    {
        userInput = Console.ReadKey(true);
        invalidSelection = !(userInput.Key == ConsoleKey.Y || userInput.Key == ConsoleKey.N);
    } while (invalidSelection);

    var categoryExist = categoryList.Any(x => x.CategoryName == categoryName);

    switch (userInput.Key)
    {
        case ConsoleKey.Y:
            if (!categoryExist)
            {
                categoryList.Add(category);
                Console.Clear();
                Console.WriteLine("Category created!");
                Thread.Sleep(2000);
            }
            else
            {
                Console.Clear();
                Console.WriteLine("Category already exist");
                Thread.Sleep(2000);
                Console.Clear();
            }
            break;

        case ConsoleKey.N:
            Console.Clear();
            shouldRetry = true; // 标记需要重试，循环将重新执行输入流程
            break;
    }
} while (shouldRetry);