避免在 C# 中使用 goto 语句
Avoid goto statement in C#
我不想使用某种 goto 语句,但我希望用户在执行默认情况时 return 到主菜单。如何??我知道这是一个简单的问题,但肯定有很多新手遇到过类似的问题。
static void buycoffee()
{
Double price = 0;
int x = 0;
while (x == 0)
{
Console.WriteLine("Pick a coffee Size");
Console.WriteLine("1: Small");
Console.WriteLine("2: Medium");
Console.WriteLine("3: Large");
int Size = int.Parse(Console.ReadLine());
switch (Size)
{
case 1:
price += 1.20;
break;
case 2:
price += 1.70;
break;
case 3:
price += 2.10;
break;
default:
Console.WriteLine("This option does not exist");
///how to return to the main menu here
break;
}
Console.WriteLine("Would you like to buy more coffee?");
String Response = Console.ReadLine().ToUpper();
if (Response.StartsWith("Y"))
{
Console.Clear();
}
else
{
x += 1;
}
}
Console.WriteLine("The total bill comes to £{0}", price.ToString("0.00"));
}
}
将您的注释行替换为:continue;
正如 Nico Schertier 所说,您可以通过以下方式完成此操作:
int Size = -1;
while (Size == -1) {
Console.WriteLine("Pick a coffee Size");
Console.WriteLine("1: Small");
Console.WriteLine("2: Medium");
Console.WriteLine("3: Large");
Size = int.Parse(Console.ReadLine());
switch (Size)
{
case 1:
price += 1.20;
break;
case 2:
price += 1.70;
break;
case 3:
price += 2.10;
break;
default:
Size = -1;
Console.WriteLine("This option does not exist");
break;
}
}
除了@Abion47 和@Dogu Arslan 的回答,您还可以为您的菜单创建一个功能,也可以为您的开关创建一个功能。
在此示例中,它将创建一个无限循环菜单
static void Menu()
{
Console.WriteLine("Menu");
Console.WriteLine("1) Take me to My fancy menu");
}
static void SwitchFunc(string input)
{
switch (input)
{
case "1":
Menu();
string inputB = Console.ReadLine();
SwitchFunc(inputB);
break;
}
}
static void Main(string[] args)
{
Menu();
string input = Console.ReadLine();
SwitchFunc(input);
}
我不想使用某种 goto 语句,但我希望用户在执行默认情况时 return 到主菜单。如何??我知道这是一个简单的问题,但肯定有很多新手遇到过类似的问题。
static void buycoffee()
{
Double price = 0;
int x = 0;
while (x == 0)
{
Console.WriteLine("Pick a coffee Size");
Console.WriteLine("1: Small");
Console.WriteLine("2: Medium");
Console.WriteLine("3: Large");
int Size = int.Parse(Console.ReadLine());
switch (Size)
{
case 1:
price += 1.20;
break;
case 2:
price += 1.70;
break;
case 3:
price += 2.10;
break;
default:
Console.WriteLine("This option does not exist");
///how to return to the main menu here
break;
}
Console.WriteLine("Would you like to buy more coffee?");
String Response = Console.ReadLine().ToUpper();
if (Response.StartsWith("Y"))
{
Console.Clear();
}
else
{
x += 1;
}
}
Console.WriteLine("The total bill comes to £{0}", price.ToString("0.00"));
}
}
将您的注释行替换为:continue;
正如 Nico Schertier 所说,您可以通过以下方式完成此操作:
int Size = -1;
while (Size == -1) {
Console.WriteLine("Pick a coffee Size");
Console.WriteLine("1: Small");
Console.WriteLine("2: Medium");
Console.WriteLine("3: Large");
Size = int.Parse(Console.ReadLine());
switch (Size)
{
case 1:
price += 1.20;
break;
case 2:
price += 1.70;
break;
case 3:
price += 2.10;
break;
default:
Size = -1;
Console.WriteLine("This option does not exist");
break;
}
}
除了@Abion47 和@Dogu Arslan 的回答,您还可以为您的菜单创建一个功能,也可以为您的开关创建一个功能。
在此示例中,它将创建一个无限循环菜单
static void Menu()
{
Console.WriteLine("Menu");
Console.WriteLine("1) Take me to My fancy menu");
}
static void SwitchFunc(string input)
{
switch (input)
{
case "1":
Menu();
string inputB = Console.ReadLine();
SwitchFunc(inputB);
break;
}
}
static void Main(string[] args)
{
Menu();
string input = Console.ReadLine();
SwitchFunc(input);
}