ProcessCmdKey does not pass Enter Key



发生了一些事情,导致我的代码总是捕获Enter键但从不处理它。 这意味着我所有的数据输入框、网格控件等都坏了。 就像Enter键已关闭一样。

我已经尝试完全删除ProcessCmdKey例程,并且仍在这样做。

我有一段相当长的代码来处理选项卡式表单上的 Enter键,但它弄乱了其他选项卡,这意味着每当按下Enter时,它都会捕获它。

所以,我只是检查了一下它在哪个选项卡上,如果不是正确的选项卡,请忽略它,简单吗? 不。

无论出于何种原因,无论我做什么,我的表单都不会处理回车键。

我回到了最基本的代码:

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
return base.ProcessCmdKey(ref msg, keyData);
}

据我了解,上面应该什么都不做,只是将按下的键传递回去,然后处理它。

这适用于除回车键以外的所有内容。 如果我有一个文本框或任何控件,那么它将接受所有输入,但它只是完全忽略Enter键。 我也尝试过return false;,但这不起作用。

我什至尝试完全删除该例程,但它仍然被破坏。 重新启动VS以防万一。

编辑: 好的,这是我开始"修复"问题之前的完整原始代码。 这工作正常,但它阻止 Enter 键在程序的其他任何地方工作。 您可以想象,最终用户对此并不十分赞赏。

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (ActiveControl.Name.ToString() != "order_creation_grid") //ensures that we don't caputre keypresses in the datagrid
{
//if (keyData == (Keys.Tab | Keys.Shift)) //tabbing backwards
//{
//    if (ActiveControl.Parent.Name.ToString() == "order_con_name_DD")
//    {
//        order_con_name_DD.Select();
//        order_con_name_DD.ShowDropDown();
//    }
//}
if (keyData == Keys.Tab || keyData == Keys.Enter)
{
if (ActiveControl.Parent.Name.ToString() == "order_shipper_dd")
{
var test = keyData;
//getAllConsignees(); remove
get_all_addresses(); //load up the address dd
order_address_dd.SelectedIndex = 0;
order_address_dd.Select();
order_address_dd.Focus();
return true;//lets the system know that the control key was handled and not to fire it again
}
else if (ActiveControl.Parent.Name.ToString() == "order_address_dd")
{
if (order_address_dd.SelectedIndex != -1)//only do this if there is not a new address in the address chooser ie: found one in database
{
order_match_dd.Select();
order_match_dd.Focus();
order_match_dd.ShowDropDown();
return true;
}
else
{
order_address_eb.Value = order_address_dd.Text;
order_consignee_eb.Select();
order_consignee_eb.Focus();
return true; ;
}
}
else if (ActiveControl.Name.ToString() == "order_match_dd")
{
if (order_match_dd.SelectedIndex != -1)//fire off when a valid selection is made
{
//check if it is a new item
if (order_match_dd.Text == "1 New")
{
//blank out the fields and position cursor to Consignee
clear_order_fields();
order_consignee_eb.Select();
order_consignee_eb.Focus();
}
else //parse the value in the match box useing the seperator | into strings and load up the correct fields
{
char[] delimiterChars = { '|' };
string[] fields = order_match_dd.Text.Split(delimiterChars);
clear_order_fields();
order_consignee_eb.Value = fields[0].ToString().Trim(); ;
order_address_eb.Value = fields[1].ToString().Trim();
order_city_eb.Value = fields[2].ToString().Trim();
order_state_eb.Value = fields[3].ToString().Trim();
order_zip_eb.Value = fields[4].ToString().Trim();
//go try and match the driver and facility with this zipcode
get_driver_facility();
order_BOL_eb.Select();
order_BOL_eb.Focus();
}
return true;
}
}
else if (ActiveControl.Parent.Name.ToString() == "order_BOL_eb")
{
int custID = Convert.ToInt16(order_shipper_dd.SelectedValue);
string testFor = order_BOL_eb.Value.ToString();
var lookFor = (from l in dbContext.stop_details
where l.cust_unique_id == testFor && l.customer_id == custID
select l).ToArray();
int count = lookFor.Count();
if (count > 0)
{
MessageBox.Show("WARNING..this BOL has been used before for this customer, make sure you really want to use it again.");
}
order_loose_qty.Focus();
return true;
}
else if (ActiveControl.Parent.Name.ToString() == "order_consignee_eb")
{
order_address_eb.Select();
order_address_eb.Focus();
return true;
}
else if (ActiveControl.Parent.Name.ToString() == "order_address_eb")
{
order_city_eb.Select();
order_city_eb.Focus();
return true;
}
else if (ActiveControl.Parent.Name.ToString() == "order_city_eb")
{
order_state_eb.Select();
order_state_eb.Focus();
return true;
}
else if (ActiveControl.Parent.Name.ToString() == "order_state_eb")
{
order_zip_eb.Select();
order_zip_eb.Focus();
return true;
}
else if (ActiveControl.Parent.Name.ToString() == "order_zip_eb")
{
//  get_driver_facility();
order_BOL_eb.Select();
order_BOL_eb.Focus();
return true;
}
else if (ActiveControl.Parent.Name.ToString() == "order_note")
{
//auto send to the grid if checkboxed
if (autoSend_cb.Checked)
{
send_to_orderGrid();
}
//otherwise just sit there...
return true;
}
}

if (keyData == Keys.Enter) //On enter key for these controls fire the tab key so that it will move to the next control
{
if (ActiveControl.Parent.Name.ToString() == "order_loose_weight")
{
SendKeys.Send("{TAB}");
}
else if (ActiveControl.Parent.Name.ToString() == "order_loose_qty")
{
SendKeys.Send("{TAB}");
}
else if (ActiveControl.Parent.Name.ToString() == "order_pallets_qty")
{
SendKeys.Send("{TAB}");
}
else if (ActiveControl.Parent.Name.ToString() == "order_pallets_weight")
{
SendKeys.Send("{TAB}");
}
else if (ActiveControl.Parent.Name.ToString() == "order_hazmat_weight")
{
SendKeys.Send("{TAB}");
}
else if (ActiveControl.Parent.Name.ToString() == "order_COD")
{
SendKeys.Send("{TAB}");
}
}
if (keyData == (Keys.Control | Keys.OemCloseBrackets))
{
this.order_shipper_dd.Select();
this.order_shipper_dd.ShowDropDown();
return true;
}
if (keyData == (Keys.Control | Keys.Enter)) //when ctrl-enter is pressed in the Order Entry screen
{
send_to_orderGrid();

return true;
}
}
return base.ProcessCmdKey(ref msg, keyData);
}

我什至可以注释掉整个例程,它仍然这样做。

我不确定你需要什么。您尚未定义回车键的"进程"含义。我最好的猜测:

1-是否希望Enter键在文本框中执行新行?将 AcceptsReturn 属性从 False 更改为 True,文本框应允许使用 Enter 键创建新行。

2 - 使用 Enter 键按 Tab 键转到下一个控件?将 keyDown 事件添加到文本框并执行以下操作:

switch (e.KeyCode)
{
case Keys.Enter:
SendKeys.Send("{TAB}");
break;
}

在发现回车键的真正问题之前,请考虑这样做:

private void Form1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
if (e.KeyCode == Keys.Return)
e.IsInputKey = true;
}

它的作用相当明显,但它现在应该可以解决您的情况。这有帮助吗?

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