如何退出 C# 中的 foreach 循环？
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How do I exit a foreach loop in C#?
提问by
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 foreachloop immediately. How do I do it?
每当违反是真的，我想foreach立即跳出循环。我该怎么做？
回答by configurator
Use break.
使用break.
Unrelated to your question, I see in your code the line:
与您的问题无关，我在您的代码中看到了这一行：
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:
在这一行中，您使用一个布尔值(name.firstname == null)。然后，您将!运算符应用于它。然后，如果值为 true，则将 Violated 设置为 false；否则为真。所以基本上， Violated 被设置为与原始表达式相同的值(name.firstname == null)。为什么不使用它，如：
Violated = (name.firstname == null);
回答by Greg Beech
Just use the statement:
只需使用以下语句：
break;
回答by Marcelo Lujan
Look at this code, it can help you to get out of the loop fast!
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;
}
}
回答by Sharunas Bielskis
During testing I found that foreach loop after break go to the loop beging and not out of the loop. So I changed foreach into for and break in this case work correctly- after break program flow goes out of the loop.
在测试期间，我发现 break 之后的 foreach 循环进入循环开始而不是循环之外。因此，我将 foreach 更改为 for 并在这种情况下 break 正常工作 - 在 break 程序流程退出循环之后。
