本文介绍了创建IEnumerable< T> .Find()的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想写:
IEnumerable<Car> cars;
cars.Find(car => car.Color == "Blue")
我可以使用扩展方法来完成此操作吗?以下操作失败,因为它递归地调用自身而不是调用IList.Find().
Can I accomplish this with extension methods? The following fails because it recursively calls itself rather than calling IList.Find().
public static T Find<T>(this IEnumerable<T> list, Predicate<PermitSummary> match)
{
return list.ToList().Find(match);
}
谢谢!
推荐答案
此方法已存在.叫做FirstOrDefault
This method already exists. It's called FirstOrDefault
cars.FirstOrDefault(car => car.Color == "Blue");
如果您要自己实现它,它将看起来像这样
If you were to implement it yourself it would look a bit like this
public static T Find<T>(this IEnumerable<T> enumerable, Func<T,bool> predicate) {
foreach ( var current in enumerable ) {
if ( predicate(current) ) {
return current;
}
}
return default(T);
}
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