C# 数字文本框
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Numeric TextBox
提问by Ricardo
Im new to programming and I dont know very much about but I'm making a calculator, and i want to use a textbox that only acepts numbers and decimals, and when the user paste text from the clipboard the textbox deletes any literal characters, like the MS calc.
我是编程新手，我不太了解，但我正在制作一个计算器，我想使用一个只接受数字和小数的文本框，当用户从剪贴板粘贴文本时，文本框会删除任何文字字符，例如MS 计算。
Please take the time to explain each part so I can learn or write it and tell me what to search.
请花时间解释每个部分，以便我可以学习或编写它并告诉我要搜索的内容。
Thanks
谢谢
EDIT: I'll make it more specific:
编辑：我会让它更具体：
How can I make a numeric textbox in C#? I've used the masked textbox but it wont take decimals.
如何在 C# 中制作数字文本框？我使用了掩码文本框，但它不会带小数。
I've read things about overloading the OnKeyPress method so it will correct any wrong characters but I dont know to do it.
我已经阅读了有关重载 OnKeyPress 方法的内容，因此它会更正任何错误的字符，但我不知道该怎么做。
采纳答案by Timur Fanshteyn
The easiest way :)
最简单的方法:)
on Keypress event on your textbox
文本框上的 Keypress 事件
if ((e.KeyChar <= 57 && e.KeyChar >= 48) || e.KeyChar == 13 || e.KeyChar == 8)
{
}
else
{
e.Handled = true;
}
回答by Fredou
here how to do this in vb.net
这里如何在 vb.net 中做到这一点
Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
Dim reg As New System.Text.RegularExpressions.Regex("[^0-9_ ]")
TextBox1.Text = reg.Replace(TextBox1.Text, "")
End Sub
just fix the regex for your specific needs
只需根据您的特定需求修复正则表达式
回答by Austin Salonen
Research the MaskedTextBox.
研究 MaskedTextBox。
The question is a little broad to explain everything. Try to focus the question if you want specifics because you're asking for a lot of the community to "explain each part." If you ask a few specific questions (and exclude the "please the the time to explain..."), you'll get better responses.
这个问题有点宽泛，无法解释一切。如果您想要细节，请尝试集中问题，因为您要求很多社区“解释每个部分”。如果你问一些具体的问题（并排除“请花时间解释……”），你会得到更好的回答。
回答by Simon
As far as I am aware there's nothing native in the .NET framework (2.0 at least) to do this. Your options would be:
据我所知，.NET 框架（至少 2.0）中没有任何本机可以做到这一点。您的选择是：
- Create a custom control which inherits from the textbox control and only allows numeric input. This has the advantage that the control can be reused.
- Handle the KeyPress event and check the charCode to only allow numeric keystrokes. This is easier but much less reusable.
- 创建一个继承自文本框控件且仅允许数字输入的自定义控件。这具有可以重复使用控件的优点。
- 处理 KeyPress 事件并检查 charCode 以仅允许数字键击。这更容易，但可重用性要低得多。
回答by Brian Sweeney
i would probably use a regular expression to screen out non-numerics.
我可能会使用正则表达式来筛选出非数字。
pseudo code:
伪代码：
for (each item in the input string) {
if (!match(some regular expression, item)) {
toss it out
} else {
add item to text box or whatever you were going to do with it
}
}
回答by Timur Fanshteyn
If you look closely, In Windows Calculator, the numbers are shown in a label not a textbox (It does not receive focus). The window receives keyboard events.
如果仔细观察，在 Windows 计算器中，数字显示在标签中而不是文本框中（它没有获得焦点）。窗口接收键盘事件。
So look at KeyPressed and KeyDown events on the form.
所以看看表单上的 KeyPressed 和 KeyDown 事件。
回答by Albert
You could use a plain textbox or label as the calculator display and just make sure the value (a string?) is always a number. For instance, you could keep a double and convert it to a string when you wish to display it.
您可以使用纯文本框或标签作为计算器显示，并确保值（字符串？）始终是数字。例如，您可以保留一个 double 并在您希望显示它时将其转换为一个字符串。
回答by Nathan
Being a novice you might be better off investing in a good third party toolkit. Radcontrols from Telerik for instance has a numeric textbox that will accomplish what you are looking for.
作为新手，您最好投资一个好的第三方工具包。例如，来自 Telerik 的 Radcontrols 有一个数字文本框，可以完成您正在寻找的内容。
回答by Guulh
There is a control in the framework which is specially made for numeric input : the NumericUpDown control. It also manages decimal values.
框架中有一个专门用于数字输入的控件：NumericUpDown 控件。它还管理十进制值。
回答by Guulh
Add an event handler for the textbox you want to be numeric only, and add the following code:
为您希望仅为数字的文本框添加事件处理程序，并添加以下代码：
private void textBoxNumbersOnly_KeyPress(object sender, KeyPressEventArgs e)
{
if (Char.IsDigit(e.KeyChar) || e.KeyChar == '\b')
{
e.Handled = false;
}
else
{
e.Handled = true;
}
}
This allows for numbers 0 to 9, and also backspaces (useful IMHO). Allow through the '.' character if you want to support decimals
这允许数字 0 到 9，以及退格（有用的恕我直言）。允许通过 '.' 字符，如果你想支持小数
