C#用Random類中的NextBytes、Next和NextDouble方法生成不同範圍內的隨機數序列

Random.Next方法

一、重載

• Next()：返回一個非負隨機整數

Random random= new Random();
Console.WriteLine("Generating 10 random numbers:");
for (int ctr = 1; ctr <= 10; ctr++)
{
	int number = random.Next();
	Console.WriteLine(number);
}

• Next(Int32)：返回一個小於所指定最大值的非負隨機整數

Random random= new Random();
Console.WriteLine("Generating 10 random numbers:");
for (int ctr = 1; ctr <= 10; ctr++)
{
	int number = random.Next(10);
	//生成的隨機值小於10
	Console.WriteLine(number);
}

• Next(Int32, Int32)：返回在指定範圍內的任意整數

Random random= new Random();
Console.WriteLine("Generating 10 random numbers:");
for (int ctr = 1; ctr <= 10; ctr++)
{
	int number = random.Next(1,10);
	//生成的隨機值大於等於1小於10
	Console.WriteLine(number);
}

Random.NextDouble方法

• 返回一個大於或等於 0.0 且小於 1.0 的隨機浮點數

• 示例

Random random= new Random();
Console.WriteLine("生成10個大於或等於0.0且小於1.0的隨機浮點數");
for (int ctr = 1; ctr <= 10; ctr++) {
   double number = random.NextDouble();
   Console.WriteLine(number);
}
//此方法返回的隨機數的實際上限爲0.99999999999999978

Random.NextBytes方法

• NextBytes(Byte[])：用隨機數填充指定字節數組的元素
• 示例

Random random= new Random();
Byte[] b = new Byte[10];
random.NextBytes(b);
Console.WriteLine("The Random bytes are: ");
for (int i = 0; i <= b.GetUpperBound(0); i++) 
    Console.WriteLine("{0}: {1}", i, b[i]);  

// 示例運行後結果爲：
//       The Random bytes are:
//       0: 131
//       1: 96
//       2: 226
//       3: 213
//       4: 176
//       5: 208
//       6: 99
//       7: 89
//       8: 226
//       9: 194

• 字節數組的每個元素都設置爲一個大於或等於0且小於或等於 MaxValue的隨機數