Here is the code which i used to for implementing Random class
class Program
{
public static void Main()
{
for (int j = 0; j < 5; j++)
{
foreach (var item in GenerateRandomList(new List<int>() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 }))
Console.Write(item + " ");
Console.WriteLine(" ");
}
}
public static List<int> GenerateRandomList(List<int> arr)
{
var random = new Random(new Random().Next(1,10000));
var ls = new List<int>();
while(arr.Count>0)
{
var index = random.Next(0, arr.Count-1);
ls.Add(arr[index]);
arr.RemoveAt(index);
}
return ls;
}
}
below are the results I am getting
first time
4 3 8 2 1 6 7 5 9 0
4 3 8 2 1 6 7 5 9 0
4 3 8 2 1 6 7 5 9 0
4 3 8 2 1 6 7 5 9 0
4 3 8 2 1 6 7 5 9 0
second time
6 3 4 2 8 5 9 1 7 0
6 3 4 2 8 5 9 1 7 0
6 3 4 2 8 5 9 1 7 0
6 3 4 2 8 5 9 1 7 0
6 3 4 2 8 5 9 1 7 0
third time
9 2 4 8 1 6 3 5 7 0
9 2 4 8 1 6 3 5 7 0
9 2 4 8 1 6 3 5 7 0
9 2 4 8 1 6 3 5 7 0
7 1 3 6 5 2 8 9 4 0
and So on..
what am i Missing?
sometimes it give different result but again it starts to repeat previous result.
>Solution :
new Random() creates a new random number generator instance, with the default seed.
In .NET Framework, the default seed value is time-dependent. In .NET Core, the default seed value is produced by the thread-static, pseudo-random number generator. From docs:
If the same seed is used for separate Random objects, they will generate the same series of random numbers.
If the default seed is time-based, and you create five Random objects in a quick succession, each of your generators will get the same seed (since time is not as precise that each instruction executes on a different timestamp), and thus produce the same pseudorandom number sequence.
You will want to create a Random instance only once; for example, as a class field.