如何有效地打破C#中的双循环?[副本]

您可以使用goto、匿名方法,将其包装在方法中,或者使用C#7本地函数

static void Main(string[] args)
{
   void localMethod()
   {
      foreach (var enemyUnit in nearbyEnemyUnits)
         foreach (var ownUnit in ownUnits)
            if (ownUnit.EngagedTargetTag == enemyUnit.tag)
               return;
   }

   localMethod();
}

额外资源

• goto (C# Reference)

• Anonymous Methods (C# Programming Guide)

• Local functions (C# Programming Guide)

foreach (var enemyUnit in nearbyEnemyUnits.Where(e=>ownUnits.Any(e1=>e1.EngagedTargetTag == e.Tag) == false))
                DoStuff(enemyUnit);

我不能告诉你我最后一次使用goto是什么时候,但你可以用C。下面是一个示例(末尾的属性链接):

public class GotoTest1
{
    static void Main()
    {
        int x = 200, y = 4;
        int count = 0;
        string[,] array = new string[x, y];

        // Initialize the array:
        for (int i = 0; i < x; i++)

            for (int j = 0; j < y; j++)
                array[i, j] = (++count).ToString();

        // Read input:
        Console.Write("Enter the number to search for: ");

        // Input a string:
        string myNumber = Console.ReadLine();

        // Search:
        for (int i = 0; i < x; i++)
        {
            for (int j = 0; j < y; j++)
            {
                if (array[i, j].Equals(myNumber))
                {
                    goto Found;
                }
            }
        }

        Console.WriteLine("The number {0} was not found.", myNumber);
        goto Finish;

    Found:
        Console.WriteLine("The number {0} is found.", myNumber);

    Finish:
        Console.WriteLine("End of search.");


        // Keep the console open in debug mode.
        Console.WriteLine("Press any key to exit.");
        Console.ReadKey();
    }
}

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/goto