用于检测ENTER的KeyDown或KeyPress [英] KeyDown or KeyPress to detect ENTER

问题描述

大家好，

我正在使用带有数字小键盘的WM2005（设备名称是Unitech的PA600）

当我尝试检测用户按下的Enter时，当我将焦点放在文本框上时，我无法得到它。

尝试在KeyDown上捕获它

private void txtActivateDG_KeyDown（ object sender， KeyEventArgs e）

{

if （（e.KeyValue == ' \ r' ））

{

//按下输入

//刷新DataGrid

//更新DataGrid选中新项目

}

}

尝试在KeyPress上捕获它

private void txtActivateDG_KeyPress（ object sender， KeyPressEventArgs e）

{

if （（e.KeyChar == '\ r' < font size = 2>））

{

//按Enter键

//刷新DataGrid

< font size = 2>

//使用新项目更新DataGrid

}

}

两个选项都不要t得到ENTER键..（并且根本不进入该功能）

有什么想法吗？

我没有遇到任何其他数字函数。

当我对一个按钮有一个焦点时，没有问题捕获ENTER和按钮点击功能统计

其中告诉我，ENTER键盘是OL

当我使用KeyPress时，我有一个不同的问题，我键入somtimes 2-3一起输入，关闭用户按下的速度..我需要禁用不需要的额外的ENTER键。 （知道怎么做？）

Eran

解决方案

抱歉，为了记录目的，为时已晚。

输入keychar = 13所以代码就是这样。

 private void txtActivateDG_KeyPress（object sender，KeyPressEventArgs e）
 {
 if（e.KeyChar == 13）
 {
 //按下输入
 //刷新DataGrid 
 //用新项更新DataGrid选择
} 
} 
 

如果你想消除不需要的输入键（例如，只有在按下多个输入键时才输入1在2秒内你将需要一个类型为 DateTime 的类级变量，你的代码将如下所示

 DateTime FirstPress = DateTime.Now; 
 private void txtActivateDG_KeyPress（object s ender，KeyPressEventArgs e）
 {
 if（（e.KeyChar == 13）&& （DateTime.Now.Subtract（FirstPress）.TotalSeconds> 2））
 {
 FirstPress = DateTime.Now; 
按++; 
 //按下输入
 //刷新DataGrid 
 //使用选中的新项目更新DataGrid 
} 
} 

Hi all,

I'm using a WM2005 that has a Numeric keypad (the device name is PA600 by Unitech)

When I try to detect an Enter pressed by the user I don't get it when I have a focus on a textbox.

 

Try to catch it on KeyDown

private void txtActivateDG_KeyDown(object sender, KeyEventArgs e)

{

if ((e.KeyValue == '\r'))

{

//Pressed Enter

//Refresh DataGrid

//Update the DataGrid with the new item picked

}

}

 

 

Try to catch it on KeyPress

private void txtActivateDG_KeyPress(object sender, KeyPressEventArgs e)

{

if ((e.KeyChar == '\r'))

{

//Pressed Enter

//Refresh DataGrid

//Update the DataGrid with the new item picked

}

}

 

Both options don't get the ENTER key..(And don't ever enter the function at all)

Any ideas?

All other numeric function I get with no problems.

When I have a Focus on a button there is no problem catch the ENTER and the buttom click function stats

Which tells me that the ENTER keypad is OL

 

When I used the KeyPress I have a different problem that I key somtimes 2-3 Enter together, depanding on the User speed of pressing..and I need to disable the unwanted extra ENTER keys. (Any idea how to that?)

 

Eran

解决方案

sorry it's too late, for documentation purposes.

the enter keychar = 13 so the code would be like this.

private void txtActivateDG_KeyPress(object sender, KeyPressEventArgs e)
{
     if (e.KeyChar == 13)
     {
          //Pressed Enter
          //Refresh DataGrid
          //Update the DataGrid with the new item picked
     }
}

if you want to eliminate the unwanted enter keys (for example take 1 enter only if it is pressed multiple times within 2 seconds you will need a class level variable of type DateTime and your code will look like this

DateTime FirstPress = DateTime.Now;
private void txtActivateDG_KeyPress(object sender, KeyPressEventArgs e)
{
       if ((e.KeyChar == 13) && (DateTime.Now.Subtract(FirstPress).TotalSeconds > 2))
       {
              FirstPress = DateTime.Now;
              presses++;
              //Pressed Enter
              //Refresh DataGrid
              //Update the DataGrid with the new item picked  
       }
}

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