我在使用以下代码时遇到问题:一切正常,我想做以下事情,
当用户更改文本框时,如果它通过了所有条件(你可以看到我的代码),它将启动一个数据库查询,该查询将更新一行。现在为了触发这个查询,我需要这个文本框的旧值,在更改之前,现在我可以如何在不添加变量来存储每个文本框的旧值的情况下做到这一点,我只有很少的那些。
是否有任何事件可以记住旧值?
谢谢。
private void txt1stRoom_Validated(object sender, EventArgs e)
{
if (txt1stRoom.Text == txt1stRoomHuman.Text || txt1stRoom.Text == txt2ndRoom.Text || txt1stRoom.Text == txt3rdRoom.Text)
MessageBox.Show("Error - Cannot Use Same Monster");
else if (txt1stRoom.Text != string.Empty)
{
SqlConnection cn = new SqlConnection("Data Source=" + serverTbx.Text + ";Initial Catalog=" + dbNameTbx.Text + ";User ID=" + dbUserTbx.Text + ";Password='" + dbPassTbx.Text + "';");
m_daoManager.init(cn);
string mobName = m_daoManager.getMonsterName(txt1stRoom.Text);
m_daoManager.close(cn);
if (mobName != string.Empty)
{
//
var result1 = MessageBox.Show("Are You Sure u want to change " +lblOrc.Text + "to "+ mobName+ " , Please Notice - This will apply the changes to your database aswell!","Are You Sure?, Please Confirm this Change!", MessageBoxButtons.YesNo);
if (result1 == System.Windows.Forms.DialogResult.Yes)
{
m_daoManager.init(cn);
foreach (int zoneID in Maps.Keys)
{
m_daoManager.updateMonstersByZone(BeforeChangetxt1stRoom.Text, AfterChangetxt1stRoom.text, zoneID);
}
m_daoManager.close(cn);
lblOrc.Text = mobName;
lblOrc.ForeColor = Color.Green;
Properties.Settings.Default.lblOrc1 = lblOrc.Text;
Properties.Settings.Default.lblOrc1Color = lblOrc.ForeColor;
}
}
else
{
MessageBox.Show("No Monster Found Under this ID");
txt1stRoom.Text = string.Empty;
lblOrc.Text = "Enter Mob ID";
lblOrc.ForeColor = Color.Red;
Properties.Settings.Default.lblOrc1 = lblOrc.Text;
Properties.Settings.Default.lblOrc1Color = lblOrc.ForeColor;
}
Properties.Settings.Default.Save();
}
}