我如何比较两个通用集合？

Question

How can I compare two generic collections? Here's my attempt with two string arrays, but it doesn't return true.

namespace genericCollections
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] xx = new string[] { "gfdg", "gfgfd", "fgfgfd" };
            string[] yy = new string[] { "gfdg", "gfgfd", "fgfgfd" };
            Console.WriteLine(ComparerCollection(xx, yy).ToString());
            Console.ReadKey();
        }

        static bool ComparerCollection<T>(ICollection<T> x, ICollection<T> y)
        {
            return x.Equals(y);
        }
    }
}

Answer 1

调用Enumerable.SequenceEqual ：

bool arraysAreEqual = xx.SequenceEqual(yy);

Answer 2

From the MSDN documenation:

The default implementation of Equals supports reference equality only, but derived classes can override this method to support value equality.

In your case xx and yy are two different instances of string[] so they are never equal. You'd have to override the .Equal() method of the string[]

But you can simply solve it by looping through the entire collection

static bool CompareCollection<T>(ICollection<T> x, ICollection<T> y)
{
       if (x.Length != y.Length)
            return false;

       for(int i = 0; i < x.Length,i++)
       {
           if (x[i] != y[i])
               return false;
       }

       return true;
}

Answer 3

您可以使用LINQ获取xx但不在xy中的元素：

 var newInXY = xx.Except(xy);