我想检查一个字符串数组是否包含多个字符串。
例如string[] array = new string[]{"A1","A2","A3"};
string item = "A1";
查找数组中的item,只包含item一次,返回false
string[] array = new string[]{"A1","A2","A3","A1"};
string item = "A1";
还真
如果您想知道某项是否重复了不止一次,您可以获取该项的计数并检查它是否大于1
:
bool isRepeated = array.Count(x => x == item) > 1;
或者,您可以更有效地使用HashSet
:
bool isRepeated = false;
var set = new HashSet<int>();
foreach(var x in array)
{
if(x == item && !set.Add(x))
{
isRepeated = true;
break;
}
}