/// <summary>生成随机的银行卡卡号
/// </summary>
/// <param name="prefix"> </param>
/// <param name="length"></param>
/// <returns></returns>
public static string GetFixNumberString(int prefix = 0, int length = 16)
{
if (length < 1)
{
throw new ArgumentException("卡号长度不能小于1");
}
var prefixLength = UtilityMath.GetLength(prefix);
var sb = new StringBuilder(length);
if (prefix > 0)
{
if (prefixLength > length)
{
sb.Append(prefix.ToString().Substring(0, length));
}
else
{
sb.Append(prefix);
}
}
for (int i = 0; i < length - prefixLength; i++)
{
sb.Append(Random.Next(0, 9));
}
return(sb.ToString());
}