问题
I need to generate random int in C#. I am using clock time to set the seend. However, as the rnd.Next() function may take less than a millisecond, this does not work if one has to generate a list of ints.
for( int i=0; i<5; i++) {
int max_val = 10; // max value
var rnd = new Random(DateTime.Now.Millisecond);
int randind = rnd.Next(0, max_val);
Console.WriteLine(randind);
}
Output:
1
5
5
5
5
How can one randomise the seed in a clean way without adding an ugly sleep?
回答1:
Create your Randomobject outside the loop and don't provide the seed parameter -- one will be picked for you. By taking it out of the loop, rnd.Next() will give you a random sequence anyway.
var rnd = new Random();
for( int i=0; i<5; i++) {
int max_val = 10; // max value
int randind = rnd.Next(0, max_val);
Console.WriteLine(randind);
}
回答2:
The Guid Object guaranties a different result each time. You could do this:
... new Random(Guid.NewGuid().GetHashCode())
来源：https://stackoverflow.com/questions/39105924/how-to-randomize-seed-in-c-sharp