How Can I Efficiently Escape Nested Loops in C#?

Efficiently break out of C# nested loops

In scenarios involving nested loops, it is crucial to quickly switch between inner and outer loops. The following two methods can effectively achieve this:

Use anonymous methods

Instead of managing boolean flags in a loop, consider using anonymous methods. This decouples the loop iteration from the exit mechanism and enables quick exit via the return statement.

Example:

<code class="language-csharp">// 创建一个封装嵌套循环的匿名方法
Action work = delegate
{
    for (int x = 0; x < 10; x++)
    {
        for (int y = 0; y < 10; y++)
        {
            if (/* 退出条件 */) return;
        }
    }
};

work(); // 调用匿名方法执行嵌套循环</code>

Use local functions (C# 7 and above only)

C# 7 introduces local functions, which provide a more efficient and readable alternative to anonymous methods. Local functions can be declared within an outer loop and terminated using the return statement.

Example:

<code class="language-csharp">// 定义一个处理嵌套循环的局部函数
void Work()
{
    for (int x = 0; x < 10; x++)
    {
        for (int y = 0; y < 10; y++)
        {
            if (/* 退出条件 */) return;
        }
    }
}

Work(); // 调用局部函数执行嵌套循环</code>

These techniques provide an efficient way to exit nested loops in a controlled manner. Avoid using exceptions as they come with a huge performance hit.

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