學用 ASP.Net 之 System.Random 類

成員:

Next();       //擷取 0 .. int.MaxValue 的 int 隨機數; 可指定範圍NextBytes();  //擷取 0 .. 255 的隨機數並填充位元組數組NextDouble(); //擷取 0 .. 1 的 double 隨機數

建構函式:

//不指定隨機種子, 則預設有系統時鐘產生種子protected void Button1_Click(object sender, EventArgs e){    Random r = new Random();    int n1 = r.Next();    int n2 = r.Next();    TextBox1.Text = string.Concat(n1, "\n", n2);}//種子值相同時, 其隨機序列也相同protected void Button2_Click(object sender, EventArgs e){    Random r1 = new Random(1);    Random r2 = new Random(1);    Random r3 = new Random(2);    byte[] bs1 = new byte[10];    byte[] bs2 = new byte[10];    byte[] bs3 = new byte[10];    r1.NextBytes(bs1);    r2.NextBytes(bs2);    r3.NextBytes(bs3);    string s1 = string.Join(", ", bs1); //70, 208, 134, 130, 64, 151, 228, 163, 149, 207    string s2 = string.Join(", ", bs2); //70, 208, 134, 130, 64, 151, 228, 163, 149, 207    string s3 = string.Join(", ", bs3); //113, 147, 198, 149, 36, 185, 227, 111, 124, 56    TextBox1.Text = string.Concat(s1, "\n", s2, "\n", s3);}

練習:

protected void Button1_Click(object sender, EventArgs e){    Random r = new Random(0);    int n1 = r.Next();           //1559595546    int n2 = r.Next(10);         //8    int n3 = r.Next(1000, 2000); //1768    TextBox1.Text = string.Concat(n1, "\n", n2, "\n", n3);}protected void Button2_Click(object sender, EventArgs e){    Random r = new Random(0);    double f;    string str = "";    for (int i = 0; i