c#随机生成强密码

c#随机生成强密码 至少包含一位数字、一位大写字母和一位小写字母

string chars = "0123456789ABCDEFGHIJKLMNOPQSTUVWXYZabcdefghijklmnpqrstuvwxyz";
Random randrom = new Random(getNewSeed());

string str = "";
for (int j = 0; j < 50; j++)
{
str = "";
for (int i = 0; i < 8; i++)
{
str += chars[randrom.Next(chars.Length)];//randrom.Next(int i)返回一个小于所指定最大值的非负随机数
}
//不符合正则，重新生成
if (!Regex.IsMatch(str, @"^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}$"))
{
continue;
}
else {
break;
}
}

 

 

private static int getNewSeed()
{
byte[] rndBytes = new byte[4];
System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider();
rng.GetBytes(rndBytes);
return BitConverter.ToInt32(rndBytes, 0);
}