检查列表是否包含任何其他列表

I have a list of parameters like this:

我有一个像这样的参数列表：

public class parameter
{
    public string name {get; set;}
    public string paramtype {get; set;}
    public string source {get; set;}
}

IEnumerable<Parameter> parameters;

And a array of strings i want to check it against.

还有一系列字符串我想检查它。

string[] myStrings = new string[] { "one", "two"};

I want to iterate over the parameter list and check if the source property is equal to any of the myStrings array. I can do this with nested foreach's but i would like to learn how to do it in a nicer way as i have been playing around with linq and like the extension methods on enumerable like where etc so nested foreachs just feel wrong. Is there a more elegant preferred linq/lambda/delegete way to do this.

我想迭代参数列表并检查source属性是否等于任何myStrings数组。我可以用嵌套的foreach来做到这一点，但我想学习如何以更好的方式做到这一点，因为我一直在玩linq，就像可枚举的扩展方法一样，所以嵌套的foreachs只是感觉不对。有没有更优雅的首选linq / lambda / delegete方法来做到这一点。

Thanks

谢谢

1 个解决方案

#1

115

You could use a nested Any() for this check which is available on any Enumerable:

您可以使用嵌套的Any（）进行此检查，该检查可用于任何Enumerable：

bool hasMatch = myStrings.Any(x => parameters.Any(y => y.source == x));

Faster performing on larger collections would be to project parameters to source and then use Intersect which internally uses a HashSet<T> so instead of O(n^2) for the first approach (the equivalent of two nested loops) you can do the check in O(n) :

在较大的集合上执行速度更快的是将参数投影到源，然后使用Intersect，它在内部使用HashSet ，而不是O（n ^ 2）用于第一种方法（相当于两个嵌套循环），您可以进行检查在O（n）：

bool hasMatch = parameters.Select(x => x.source)
                          .Intersect(myStrings)
                          .Any();

Also as a side comment you should capitalize your class names and property names to conform with the C# style guidelines.

另外，作为附注，您应该将您的类名和属性名称大写，以符合C＃样式指南。

#1

115