c# - How do I exit a foreach loop in C#?

Question

foreach (var name in parent.names)
{
    if name.lastname == null)
    {
        Violated = true;
        this.message = "lastname reqd";
    }

    if (!Violated)
    {
        Violated = !(name.firstname == null) ? false : true;
        if (ruleViolated)
            this.message = "firstname reqd";
    }
}

Whenever violated is true, I want to get out of the foreach loop immediately. How do I do it?

Answer 1

Use break.

---

Unrelated to your question, I see in your code the line:

Violated = !(name.firstname == null) ? false : true;

In this line, you take a boolean value (name.firstname == null). Then, you apply the ! operator to it. Then, if the value is true, you set Violated to false; otherwise to true. So basically, Violated is set to the same value as the original expression (name.firstname == null). Why not use that, as in:

Violated = (name.firstname == null);

Answer 2

Just use the statement:

break;

Answer 3

Use the break keyword.

Answer 4

看看这段代码，它可以帮助你快速跳出循环！

foreach (var name in parent.names)
{
   if (name.lastname == null)
   {
      Violated = true;
      this.message = "lastname reqd";
      break;
   }
   else if (name.firstname == null)
   {
      Violated = true;
      this.message = "firstname reqd";
      break;
   }
}

Answer 5

在测试期间，我发现 break 后的 foreach 循环进入循环而不是循环之外。因此，我将 foreach 更改为 for ，并且在这种情况下 break 可以正常工作-在 break 程序流退出循环后。