C# 如何从另一个窗体关闭和重新打开窗体？

我有一个包含员工列表的列表框，当调用

选定索引更改事件时，会打开一个新表单，其中包含一些员工信息，如电子邮件、姓名、位置。但是，当单击其他用户时，我希望上一个表单关闭并打开新选定的员工

这是我用来尝试关闭表单然后重新打开表单的当前代码，但我在dispose调用中遇到错误：

System.ObjectDisposedException: 
"Cannot access a disposed object. Object name: 'EmployeeInfoPopup'.

代码位于事件
员工列表框\u SelectedIndexChanged
中

EmployeeInfoPopup popup = new EmployeeInfoPopup();
if(popup.Enabled == true)
{
     popup.Dispose();
     popup.employeePopupLayout(employeeListBox.SelectedIndex);
     popup.Show();
}
else
{
     popup.employeePopupLayout(employeeListBox.SelectedIndex);
     popup.Show();
}

这是在
EmployeeInfoPopup
表单中调用的方法

public void employeePopupLayout(int currentEmployeeIndex)
{
     SeatingChart_2_0 seatingChart = new SeatingChart_2_0();
     employeeLabel.Text = ($"Name: {seatingChart.employeesNames[currentEmployeeIndex]}\nEmail: {seatingChart.employeesEmails[currentEmployeeIndex]}\nBuilding: {seatingChart.employeesBID[currentEmployeeIndex]}\nFloor: {seatingChart.employeesFID[currentEmployeeIndex]}\nSeat: {seatingChart.employeesSID[currentEmployeeIndex]}");
}

如果实例是
Dispose
d

 popup.Dispose();

您无法再打开它（所有必需的资源，如
Handle
都已释放）

如果要删除所有此类表单：

   var forms = Application
      .OpenForms
      .OfType<EmployeeInfoPopup>()
      .ToArray();

   foreach (var form in forms)
     form.Close();

您可以尝试以下模式：

using System;
using System.Linq;
using System.Collections.Generic;
using System.Windows.Forms;

static private Dictionary<int, EmployeeInfoPopup> EmployeeInfoForms 
  = new Dictionary<int, EmployeeInfoPopup>();

private void EmployeeListBox_SelectedIndexChanged(object sender, EventArgs e)
{
  int index = EmployeeListBox.SelectedIndex;
  if ( EmployeeInfoForms.ContainsKey(index) )
  {
    EmployeeInfoForms[index].Close();
  }
  else
  {
    EmployeeInfoPopup popup = new EmployeeInfoPopup();
    EmployeeInfoForms.Add(index, popup);
    popup.employeePopupLayout(index);
    popup.Show();
  }
}

static internal void EmployeeInfoPopupClosed(EmployeeInfoPopup sender)
{
  var key = EmployeeInfoForms.FirstOrDefault(v => v.Value == sender).Key;
  if ( key != null )
    EmployeeInfoForms.Remove(key);
}

若您只有一个具有ListBoxClassName的FormW实例，则此方法可以正常工作，否则需要更多代码来使用由具有ListBoxClassName的FormW键入的上一个词典来管理实例

告诉我您的情况，我会更新代码。
我在dispose调用中遇到错误，请发布此错误，堆栈跟踪可能会有帮助吗？我最好的猜测是，如果代码被激活，你是<代码>处理<代码>弹出< /代码>实例，但是你试图访问<代码> SeaMePopuPoPult。“我要把它扔掉，扔掉，扔掉，不再使用它，我已经用完了，我保证再也不会使用它“。不要只是调用随机方法而不知道它们的作用。他们都会做事。在给他们打电话之前先弄清楚他们在做什么。那么有没有办法关闭弹出窗口，但不处理它？我需要在调用EmployeePopupPlayout之前调用popup.show（）吗？@SauerweinB call
popup.Hide（）
。
   var forms = Application
      .OpenForms
      .OfType<EmployeeInfoPopup>()
      .ToArray();

   foreach (var form in forms)
     form.Close();

  // Create a new EmployeeInfoPopup instance
  EmployeeInfoPopup popup = new EmployeeInfoPopup(); 

  popup.employeePopupLayout(employeeListBox.SelectedIndex);
  popup.Show();

using System;
using System.Linq;
using System.Collections.Generic;
using System.Windows.Forms;

static private Dictionary<int, EmployeeInfoPopup> EmployeeInfoForms 
  = new Dictionary<int, EmployeeInfoPopup>();

private void EmployeeListBox_SelectedIndexChanged(object sender, EventArgs e)
{
  int index = EmployeeListBox.SelectedIndex;
  if ( EmployeeInfoForms.ContainsKey(index) )
  {
    EmployeeInfoForms[index].Close();
  }
  else
  {
    EmployeeInfoPopup popup = new EmployeeInfoPopup();
    EmployeeInfoForms.Add(index, popup);
    popup.employeePopupLayout(index);
    popup.Show();
  }
}

static internal void EmployeeInfoPopupClosed(EmployeeInfoPopup sender)
{
  var key = EmployeeInfoForms.FirstOrDefault(v => v.Value == sender).Key;
  if ( key != null )
    EmployeeInfoForms.Remove(key);
}

TheFormWithTheListBoxClassName.EmployeeInfoPopupClosed(this);