如何检查我的阵列重复里面的值? [英] How do I check if my array has repeated values inside it?
问题描述
因此,这里是我的数组。
So here is my array.
double[] testArray = new double[10];
// will generate a random numbers from 1-20, too lazy to write the code
我想打一个搜索循环来检查是否正在重复任意值。我该怎么做呢?
I want to make a search loop to check if any values are being repeated. How do I do that?
我想preFER不使用任何特殊的内置方法,因为这是一小阵。
I would prefer not to use any special built-in methods since this is a small array.
推荐答案
您可以用少许的Linq做到这一点:
You could do this with a little Linq:
if (testArray.Length != testArray.Distinct().Count())
{
Console.WriteLine("Contains duplicates");
}
鲜明
扩展方法删除任何重复, 计数
得到结果集的大小。如果他们都不同,那么在列表有些重复。
The Distinct
extension method removes any duplicates, and Count
gets the size of the result set. If they differ at all, then there are some duplicates in the list.
另外,这里的更复杂的查询,但它可能是一个更有效的一点:
Alternatively, here's more complicated query, but it may be a bit more efficient:
if (testArray.GroupBy(x => x).Any(g => g.Count() > 1))
{
Console.WriteLine("Contains duplicates");
}
GROUPBY
方法将组中的任何相同的元素在一起,的 任何
返回真正
如果有任何团体已超过一种元素
The GroupBy
method will group any identical elements together, and Any
return true
if any of the groups has more than one element.
上述两种解决方案通过利用工作的HashSet< T>
,但你可以使用一个直接像这样:
Both of the above solutions work by utilizing a HashSet<T>
, but you can use one directly like this:
if (!testArray.All(new HashSet<double>().Add))
{
Console.WriteLine("Contains duplicates");
}
或者,如果你preFER不依赖于LINQ的根本解决办法:
Or if you prefer a solution that doesn't rely on Linq at all:
var hashSet = new HashSet<double>();
foreach(var x in testArray)
{
if (!hashSet.Add(x))
{
Console.WriteLine("Contains duplicates");
break;
}
}
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