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List<char> chars = new List<char>(62);
for (int i = 0; i < 10; i++)
chars.Add((char)('0' + i));
for (int i = 0; i < 26; i++)
chars.Add((char)('A' + i));
for (int i = 0; i < 26; i++)
chars.Add((char)('a' + i));
string result = "";
int index;
Random r = new Random();
for (int i = 0; i < 8; i++)
{
index = r.Next(chars.Count);
result += chars[index].ToString();
chars.RemoveAt(index);
}
Response.Write(result);
/// <summary>
/// 生成随机字母字符串(数字字母混和)
/// </summary>
/// <param name="codeCount">待生成的位数</param>
/// <returns>生成的字母字符串</returns>
private string GenerateCheckCode(int codeCount)
{
string str = string.Empty;
long num2 = DateTime.Now.Ticks + this.rep;
this.rep++;
Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> this.rep)));
for (int i = 0; i < codeCount; i++)
{
char ch;
int num = random.Next();
if ((num % 2) == 0)
{
ch = (char)(0x30 + ((ushort)(num % 10)));
}
else
{
ch = (char)(0x41 + ((ushort)(num % 0x1a)));
}
str = str + ch.ToString();
}
return str;
}