如何将数据库中的多个数据存储在同一个文本框中？ C＃

Question

您好，感谢您查看我的问题！我在从我的数据库中获取多个数据时遇到了一些麻烦。我试图在一个文本框中显示多个数据，但它当然不允许。

我的代码：

string authorised = "notReviewed";
    SundownDatabaseEntities5 dbb = new SundownDatabaseEntities5();
    System.Windows.Forms.Form ff = System.Windows.Forms.Application.OpenForms["Login"];
        int idd = Convert.ToInt32(((Login)ff).idTb.Text);
        var getrecordd = dbb.Holidays.Where(a => a.Id == idd).SingleOrDefault();

            if (getrecordd.Authorised == authorised)
            {
            holidaysAuthorisedTb.Text = "Your holiday request (" + getrecordd.Datefrom + " - "+getrecordd.Dateto+") has been sent. Waiting for manager to authorise it...";
            }

FirstOrDefault(); 获取它找到的第一个数据，但我需要它们。我将如何着手制作它以显示多个数据而不是一个数据？谢谢大家！

例如文本框：

您的假期请求 (" + getrecordd.Datefrom + " - "+getrecordd.Dateto+") 已发送。等待经理授权...

您的休假请求(" + getrecordd.Datefrom + " - "+getrecordd.Dateto+")已获批准。

Answer 1

你可以获取所有记录然后使用foreach。

var getrecordds = dbb.Holidays.Where(a => a.Id == idd).ToList();
foreach (var getrecordd in getrecordds) 
{
   if (getrecordd.Authorised == authorised)
   {
        holidaysAuthorisedTb.Text += "Your holiday request (" + getrecordd.Datefrom + " - "+getrecordd.Dateto+") has been sent. Waiting for manager to authorise it...";
   } 
   else 
   {
       holidaysAuthorisedTb.Text += "Your holiday request (" + getrecordd.Datefrom + " - "+getrecordd.Dateto+") has been sent. Waiting for manager to authorise it..."
    }

}

或使用ForEach方法

dbb.Holidays.Where(a => a.Id == idd).ForEach ( x => 
{
       if (x.Authorised == authorised)
       {
            holidaysAuthorisedTb.Text += "Your holiday request (" + x.Datefrom + " - "+x.Dateto+") has been sent. Waiting for manager to authorise it...";
       } 
       else 
       {
           holidaysAuthorisedTb.Text += "Your holiday request (" + x.Datefrom + " - "+x.Dateto+") has been sent. Waiting for manager to authorise it..."
       }
});

如何将数据库中的多个数据存储在同一个文本框中？ C＃

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