/// <summary>
/// 获取签名
/// </summary>
/// <param name="orderId">订单ID</param>
/// <param name="rand">随机字符串</param>
/// <returns></returns>
public static string GetSign(int orderId, string rand)
{
return(StaticMethod.MD5("orderId=" + orderId.ToString() + "&rand=" + rand.ToString() + "&key=" + Var.key));
}