I am trying to assign values to 0th position of a 2D integer array. However, I get a NullReferenceException exception, though I am passing proper values.
public static int[,] Ctable;
private static void GetTable(int m,int n)
{
m = 16;
for (int i = 1; i <= m; i++)
{
Ctable[i, 0] = 1; // Here it is giving Exception
}
}
You don't initialize the 2D array Ctable correctly, it's still null. See my example below. I initialize the array with the size of the input parameter m and n of the method void GetTable(int m, int n).
Your loop is not correct as well. Arrays are zero indexed (0, n - 1). You will find some additional information to initialize arrays here.
public static int[,] Ctable;
private static void GetTable(int m, int n)
{
Ctable = new int[m, n]; // Initialize array here.
for (int i = 0; i < m; i++) // Iterate i < m not i <= m.
{
Ctable[i, 0] = 1;
}
}
However, you will always overwrite Ctable. Probably you're looking for something like:
private const int M = 16; // Size of the array element at 0.
private const int N = 3; // Size of the array element at 1.
public static int[,] Ctable = new int [M, N]; // Initialize array with the size of 16 x 3.
private static void GetTable()
{
for (int i = 0; i < M; i++)
{
Ctable[i, 0] = 1;
}
}
