在C#2.0中随机分钟

Question

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
           /// add random datetime to it
           if (!dr.IsNull("login_time"))
           {
               DateTime dt = Convert.ToDateTime(dr["login_time"]);
               Random rand = new Random();
               //return random.Next(0, 59);
               dt = dt.AddMinutes(rand.Next(0,59));
               dt = dt.AddSeconds(rand.Next(0, 59));
               dr["logout_time"] = dt;

           }

       }
    }

Answer 1

你可以用这个:

Random random = new Random();

foreach(DataRow dr ...)
{
   int rand = random.Next(0, 60); 
}

正如评论指出的那样,您不需要为要创建的每个数字创建新的Random对象.(实际上,你可能不应该).

Answer 2

尝试使用Random:

Random randGen = new Random();

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(randGen.Next(0, 60));
           /// "?"<--here I want to add random minutes
       }            
   }
}