验证 - 文本框只允许小数 [英] Validation-Textboxes allowing only decimals

问题描述

我使用以下用于验证文本框代码。

I am using following code for validating textbox.

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    e.Handled = SingleDecimal(sender, e.KeyChar);
}

public bool SingleDecimal(System.Object sender, char eChar)
{
    string chkstr = "0123456789.";
    if (chkstr.IndexOf(eChar) > -1 || eChar == Constants.vbBack) 
    {
        if (eChar == ".") 
        {
            if (((TextBox)sender).Text.IndexOf(eChar) > -1) 
            {     
                return true;
            }
            else 
            {         
                return false;  
            }
        }   
        return false;
     }
     else 
     {
         return true;  
     }
}

问题是Constants.vbBack是显示error.If我没有使用Constants.vbBack，退格并不workimg.What改变我可以让工作backspace.Can人帮助？

Problem is Constants.vbBack is showing error.If i didnt use Constants.vbBack,backspace is not workimg.What alteration can i make to work backspace.Can anybody help?

推荐答案

在这里是我会用...

here is the code I would use...

    private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
        // allows 0-9, backspace, and decimal
        if (((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8 && e.KeyChar != 46))
        {
            e.Handled = true;
            return;
        }

        // checks to make sure only 1 decimal is allowed
        if (e.KeyChar == 46)
        {
            if ((sender as TextBox).Text.IndexOf(e.KeyChar) != -1)
                e.Handled = true;
        }
    }

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