文本框应仅获取数字且仅包含小数点后一位 [英] Textbox should get only numeric with only one decimal

问题描述

我在下面的编码中使用.但它也接受字母.如何防止这种情况，
[我给定keypreview = false并尝试使用keypreview = true]

i used below coding. but its accepting alphabets also., how to prevent this.,
[i given keypreview=false and tried with keypreview=true]

private void txtorate_KeyPress(object sender,KeyPressEventArgs e)
        {

            if(!char.IsControl(e.KeyChar)&&(!char.IsDigit(e.KeyChar))&& e.KeyChar!='.')
            {
                e.Handled = true;
            }

            if (e.KeyChar == '.' && (sender as TextBox).Text.IndexOf('.') > -1)
            {
                e.Handled = true;
            }
        }

推荐答案

为什么不使用 ^ ]代替?几乎就是它的设计目标.

Why not use a NumericUpDown[^] instead? That is pretty much what it was designed for...

请参阅此MSDN文章，其中向您显示代码:
http://msdn.microsoft.com/en-us/library/ms229644％28v = vs.80％29.aspx [ ^ ]

See this MSDN article which shows you the code:
http://msdn.microsoft.com/en-us/library/ms229644%28v=vs.80%29.aspx[^]

使用||代替&&在第一个条件下:

Use || instead of && in first condition:

private void txtorate_KeyPress(object sender,KeyPressEventArgs e)
{
    if(!char.Control(e.KeyChar) || (!char.IsDigit(e.KeyChar)) || e.KeyChar != '.')

        if (e.KeyChar == '.' && (sender as TextBox).Text.IndexOf('.') > -1)

                e.Handled = true;
}

我认为这会有所帮助.

I think it would help.

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