相关疑难解决方法(0)

何我要在数据集中向列中添加随机分钟,这是我的代码:

protected void btnUpdateTable_Click(object sender, EventArgs e)
{ 


    foreach (DataRow dr in ds.Tables[0].Rows)
    {
       ///check if column[logout] is null or empty, fill it
       if(dr.IsNull("logout_time"))
       {
           ///get the login colum datetime
           /// add random datetime to it
           if (!dr.IsNull("login_time"))
           {
               DateTime dt = Convert.ToDateTime(dr["login_time"]);
               dt = dt.AddMinutes(?);/// "?"<--here I want to add random minutes
           }            
       }
    }

任何帮助非常感谢.

谢谢大家的帮助,这是我的最终代码片段:

foreach (DataRow dr in ds.Tables[0].Rows)
    {
       ///check if column[logout] is null or empty, fill it
       if(dr.IsNull("logout_time"))
       {
           ///get the login colum datetime …

生成随机密码很简单.但是生成批次更加困难.

    public static string getRandomPassword(int letters, int getallen) {
        //int letters = 8;
        //int getallen = 5;

        char[] letterdeel = new char[letters];
        int minGetal = (int)Math.Pow(10, getallen - 1);
        int maxGetal = (int)Math.Pow(10, getallen);

        string password;
        Random r = new Random();
        int test = (int)(DateTime.Now.Ticks);
        for (int i = 0; i < letters; i++) {
            r = new Random((int)(DateTime.Now.Ticks) + i);
            bool capital = r.Next(2) == 0 ? true : false;
            if (capital) {
                letterdeel[i] = (char)r.Next(65, 91);
            } else …