问题在数字文本框中，第三个分隔 [英] Problem On a numeric textbox with sepration on third

问题描述

我管理一个TextBox，用户只能输入Integer字符和Backspace键.同样，这些字符将在第三个位置这样分隔(921,323,456).
问题是当我按退格键时，该数字位于数字中间，但该字符将被删除，但光标位置将移至第一个输入整数的第一个位置.例如，在上面的数字中，当我删除字符"4"时，光标位置将移至字符"9".

分隔数字的功能:

I manage a TextBox which user can input just Integer characters and backspace key. Also this characters would be separated on third position like this(921,323,456).
the problem is in middle of number when I press backspace the character would be delete but cursor position will go to first position of first input integer. for example in number above when I delete char ''4'' the cursor position will go to char ''9''.

function for separating numbers:

 public static void SpiltOnThird_TextChanged(object sender, EventArgs e)
{
        TextBox txb = (TextBox)sender;
        txb.Text=numberSpiltOnThird(txb.Text);
        txb.Select(txb.Text.Length, 0);
}
 public static string numberSpiltOnThird(string num)
{
    if (num != ("0") & !string.IsNullOrEmpty(num))
    {
        NumberFormatInfo nfi = new NumberFormatInfo();
        num = num.Replace(",", "");
        num = Convert.ToInt64(num).ToString();
        nfi.NumberDecimalDigits = 0;
        return decimal.Parse(num).ToString("n", nfi);
    }
    else
        return "";
}

推荐答案

为什么不使用文本框的遮罩，

然后在特定文本框中的按键事件上使用上面的代码

why don''t you use masking of textbox,

and then on keypress event on particular textbox use the above code

if (!char.IsNumber(e.KeyChar) && e.KeyChar.ToString() != "\b")
            {
                e.Handled = true;
            }

希望对您有所帮助:)

hope dis helps :)

文本框中的当前插入符位置(指示用户输入位置的"I"光束，"cursor"是不同的野兽)不是很明显-它是SelectionStart索引值.因此，请先阅读它，这样您便知道他在哪里，然后可以将其设置为将他放在您想要的地方.

The current caret position (the "I" beam that indicates the user input position, "cursor" is a different beastie) in a text box isn''t obvious - it''s the SelectionStart index value. So read it first, so you know where he was, and you can set it afterwards to put him where you want him.

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