vb.net版
Private Shared constant As Char() = {"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", "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"} 
Public Shared Function GenerateRandom()Function GenerateRandom(ByVal Length As Integer) As String 
Dim newRandom As System.Text.StringBuilder = New System.Text.StringBuilder(62) Dim rd As Random = New Random Dim i As Integer = 0 While i < Length newRandom.Append(constant(rd.Next(62))) System.Math.Min(System.Threading.Interlocked.Increment(i),i-1) End While Return newRandom.ToString 
End Functionprivate static char[] constant= 
{ '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', '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' }; public static string GenerateRandom(int Length) { System.Text.StringBuilder newRandom = new System.Text.StringBuilder(62); Random rd= new Random(); for(int i=0;i<Length;i++)
{ newRandom.Append(constant[rd.Next(62)]);
} return newRandom.ToString(); }string str=GenerateRandom(6);//参数表示需要产生随机数的数目
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