How to compare multidimensional arrays in C# ?

问题

How to compare multidimensional arrays? Just true/false.

double[,] data1 = new double[,] { { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };    
double[,] data2 = new double[,] { { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };

//bool compare = data1.SequenceEqual(data2);

Is there way to compare 2d arrays like 1d array ?

data1.SequenceEqual(data2);     

I have to compare every second, so easiest way will be great. Thanks a lot.

回答1:

A multidimensional array can be used in linq as one dimensional enumerable. You just need to check also for the length of all dimensions. This snippet should be enough:

var equal =
    data1.Rank == data2.Rank &&
    Enumerable.Range(0,data1.Rank).All(dimension => data1.GetLength(dimension) == data2.GetLength(dimension)) &&
    data1.Cast<double>().SequenceEqual(data2.Cast<double>());

回答2:

You can flat a multi-dimension array with .Cast<String>

Console.WriteLine("2D Array");
String[,] array2d = new String[,] { { "A1", "B1" }, { "A2", "B2" } };
foreach(var s in array2d.Cast<String>())
    Console.Write(s + ", ");

Console.WriteLine("\r\n3D Array");
String[,] array3d = new String[,] { { "A1", "B1", "C1" }, { "A2", "B2", "C1" } };
foreach (var s in array3d.Cast<String>())
    Console.Write(s + ", ");

Output

2D Array
A1, B1, A2, B2, 
3D Array
A1, B1, C1, A2, B2, C1, 

回答3:

you can also try to solve it with 2 for-loops and comparing them with the counters.

maybe something like this?

for(int counter1 = 0; counter1 < data1.GetLength(0); counter1++)
{
   for(int counter2 = 0; counter2 < data2.GetLength(1); counter2++)
   {
      if(data1[counter1, counter2] == data2[counter1, counter2])
      {
         bool isEqual = true;
      }    
   }
}      

回答4:

You can do this

data1.SequenceEqual(data2);  

来源：https://stackoverflow.com/questions/12446770/how-to-compare-multidimensional-arrays-in-c-sharp