C# generates random numbers

Little scum · Posted on 10/30/2015 2:50:33 PM

/// <summary>
/// 创建随机数
/// </summary>
/// <param name="num"></param>
/// <returns></returns>
private string CreateRandom(int num)
{
string str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
StringBuilder sb = new StringBuilder();
for (int i = 0; i < num; i++)
{
sb.Append(str[new Random(Guid.NewGuid().GetHashCode()).Next(0, str.Length - 1)]);
}
return sb.ToString();
}

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Little scum · Posted on 11/12/2015 10:45:43 AM

/// <summary>
/// 生成指定长度的随机码。
/// </summary>
private string CreateRandomCode(int length)
{
string[] codes = new string[36] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
StringBuilder randomCode = new StringBuilder();
Random rand = new Random();
for (int i = 0; i < length; i++)
{
randomCode.Append(codes[rand.Next(codes.Length)]);
}
return randomCode.ToString();
}

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[Source] C# generates random numbers