public static T[,] To2dArray(this List> list)
{
if (list.Count == 0 || list[0].Count == 0)
throw new ArgumentException("The list must have non-zero dimensions.");
var result = new T[list.Count, list[0].Count];
for(int i = 0; i < list.Count; i++)
{
for(int j = 0; j < list[i].Count; j++)
{
if (list[i].Count != list[0].Count)
throw new InvalidOperationException("The list cannot contain elements (lists) of different sizes.");
result[i, j] = list[i][j];
}
}
return result;
}
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