KeyDown事件 - 如何轻松地知道，如果按下的键是数字？ [英] KeyDown event - how to easily know if the key pressed is numeric?

问题描述

我目前正在处理DataGridView控件的KeyDown事件。
其中一列是由计算的值填补，我希望用户能够重写，如果他们想要的单元值。

I am currently handling the KeyDown event of a DataGridView control. One of the columns is filled by calculated values and I want the user to be able to override the cell value if they want.

当用户按下数字键，所述细胞进入编辑模式，并允许用户覆盖的值。如果关键不是数字，没有任何反应...

When the user presses a numeric key, the cell goes into EditMode and allows the user to override the value. If the key is not numeric, nothing happens...

这是相当不错的了...问题是，我觉得它难看... $代码b $ b我似乎无法找到一个巧妙的方法来处理在一个条件的所有数字键，所以我做了一个开关盒结构来应对所有可能的数字键，如下所示：

That is working pretty well... the problem is that I find the code for it ugly... I can't seem to find a neat way to handle all the numeric keys in a single condition, so I've made a switch case construct to deal with all the possible numeric keys, like this:

                switch (e.KeyCode)
                {
                    case Keys.D0:
                    case Keys.D1:
                    case Keys.D2:
                    case Keys.D3:
                    case Keys.D4:
                    case Keys.D5:
                    case Keys.D6:
                    case Keys.D7:
                    case Keys.D8:
                    case Keys.D9:
                    case Keys.Decimal:
                    case Keys.NumPad0:
                    case Keys.NumPad1:
                    case Keys.NumPad2:
                    case Keys.NumPad3:
                    case Keys.NumPad4:
                    case Keys.NumPad5:
                    case Keys.NumPad6:
                    case Keys.NumPad7:
                    case Keys.NumPad8:
                    case Keys.NumPad9:

                         [code to make the cell go to editMode, etc...]

当然，它的工作原理，但必须有一个更好的和更短的方式，对吧？

Sure, it works, but there has to be a better and shorter way, right?

所有我能找到使用谷歌是用数字键时，转换e.KeyCode为char，但是，它会给出信件甚至对数值...

All I could find using Google is converting e.KeyCode to a char, but when using numeric keys, it goes gives letters even for the numeric values...

感谢。

推荐答案

如果您使用的KeyPress 情况下，活动签名有一个 KeyPressEventArgs 与 KeyChar 成员，让你的numberpad键的字符。您可以在这做的TryParse找出如果一个号码或没有。

If you use the KeyPress event, the event signature has a KeyPressEventArgs with a KeyChar member that gives you the character for the numberpad keys. You can do a TryParse on that to figure out if its a number or not.

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
    int i;
    if (int.TryParse(e.KeyChar.ToString(), out i))
    {
        MessageBox.Show("Number");
    }
}

这篇关于KeyDown事件 - 如何轻松地知道，如果按下的键是数字？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！