c# - 事件处理程序覆盖？

Question

我试图提出一种方法来轻松检测Winform上的控件是否已更改。这种方法有效，但是它不提供有关已更改哪些控件的信息。有没有一种方法可以重写TextChanged事件，使其通过传递，而EventArg包含触发该事件的控件的名称？当AccountChangedHandler执行时，发件人参数包含有关文本框的信息，例如'.Text'属性的当前值，但我看不到哪个控件引发了该事件。

private bool _dataChanged = false;

internal TestUserControl()
{
  InitializeComponent();

  txtBillAddress1.TextChanged += new System.EventHandler(AccountChangedHandler);
  txtBillAddress2.TextChanged += new System.EventHandler(AccountChangedHandler);
  txtBillZip.TextChanged += new System.EventHandler(AccountChangedHandler);
  txtBillState.TextChanged += new System.EventHandler(AccountChangedHandler);
  txtBillCity.TextChanged += new System.EventHandler(AccountChangedHandler);
  txtCountry.TextChanged += new System.EventHandler(AccountChangedHandler);

  txtContactName.TextChanged += new System.EventHandler(AccountChangedHandler);
  txtContactValue1.TextChanged += new System.EventHandler(AccountChangedHandler);
  txtContactValue2.TextChanged += new System.EventHandler(AccountChangedHandler);
  txtContactValue3.TextChanged += new System.EventHandler(AccountChangedHandler);
  txtContactValue4.TextChanged += new System.EventHandler(AccountChangedHandler);

}

private void AccountChangedHandler(object sender, EventArgs e)
{
  _dataChanged = true;
}

Answer 1

void AccountChangedHandler(object sender, EventArgs e)
{
   string n = ((TextBox)sender).Name;
   string t = ((TextBox)sender).Text;
   // or instead of cast
   TextBox tb = sender as TextBox; // if sender is another type, tb is null
   if(tb != null)
   {
     string n = tb.Name;
     string t = tb.Text;
   }
}

你也可以尝试使用

foreach (Control c in this.Controls)
{
 c.TextChanged += new EventHandler(AccountChangedHandler);
}