c# textbox 只能输入数字，退格，小数点。如何实现

wcl0201wcl 2009-08-04 04:16:46

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xiaod1986 2010-04-17

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过来学习！！！

psho78 2009-08-04

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textbox_keypress(eventargs e)
if(e.keychar>?? ||e.keychar<?? ||e.keychar==??||e.keychar==??)
{do what you want to do}
else
e.handle=true;

chaozi_249 2009-08-04

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private bool IsAllNumber(string text)

        {

            Regex objNotNumberPattern = new Regex("[^0-9.-]");

            Regex objTwoDotPattern = new Regex("[0-9]*[.][0-9]*[.][0-9]*");

            Regex objTwoMinusPattern = new Regex("[0-9]*[-][0-9]*[-][0-9]*");

            String strValidRealPattern = "^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$";

            String strValidIntegerPattern = "^([-]|[0-9])[0-9]*$";

            Regex objNumberPattern = new Regex("(" + strValidRealPattern + ")|(" + strValidIntegerPattern + ")");

            return !objNotNumberPattern.IsMatch(text) && !objTwoDotPattern.IsMatch(text) && !objTwoMinusPattern.IsMatch(text) && objNumberPattern.IsMatch(text);

        }

风之影子 2009-08-04

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private void textBox2_KeyPress(object sender, KeyPressEventArgs e)
{
//检测是否已经输入了小数点
bool IsContainsDot = this.textBox2 .Text.Contains(".");
if ((e.KeyChar < 48 || e.KeyChar > 57) && (e.KeyChar != 8) && (e.KeyChar != 46))
{
e.Handled = true;
}
else if (IsContainsDot && (e.KeyChar == 46)) //如果输入了小数点，并且再次输入
{
e.Handled = true;
}

}

kennie_190602169 2009-08-04

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啊...格式丑了点,见谅见谅,将就将就.

daone 2009-08-04

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自定义控件才是根本

kennie_190602169 2009-08-04

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  private   void   textBox1_KeyPress(object   sender,   System.Windows.Forms.KeyPressEventArgs   e)   

  {   

  //限制只能输入字母和数字   

  　　if(!((e.KeyChar   >=   '0'   &&   e.KeyChar   <=   '9') || e.KeyChar == '.' ||((int)e.KeyChar   ==   (int)System.Windows.Forms.Keys.Back)))   

  {   

  　　e.Handled   =   true;   

  }   

  }

daone 2009-08-04

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[ToolboxData("<{0}:NumberBox runat=server></{0}:NumberBox>"), DefaultProperty("Text")]
public class NumberBox : TextBox
{
// Methods
protected override void AddAttributesToRender(HtmlTextWriter writer)
{
base.AddAttributesToRender(writer);
writer.AddAttribute("OnKeyDown", "NumberKey()");
}

protected override void OnLoad(EventArgs e)
{
if (!this.Page.IsClientScriptBlockRegistered("NumberBoxScript"))
{
this.Page.RegisterClientScriptBlock("NumberBoxScript", this.RenderScript());
}
base.OnLoad(e);
}

protected override void Render(HtmlTextWriter output)
{
base.Render(output);
}

private string RenderScript()
{
string str = "";
return (((((str + "\n<script language=\"javascript\"> \n") + "function NumberKey() \n" + "{ \n") + "\tif(!( (event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)||(event.keyCode==8||event.keyCode==110||event.keyCode==190||event.keyCode==37||event.keyCode==39) )) \n" + "\t{ \n") + "\t\tevent.returnValue = false; \n" + "\t} \n") + "} \n" + "</script> \n");
}
}

jinshanxia 2009-08-04

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JS+正则

muyebo 2009-08-04

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        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)

        {

            if ((e.KeyChar < '0' && e.KeyChar != '.' || e.KeyChar > '9' && e.KeyChar != '.' || ((TextBox)(sender)).Text.IndexOf('.') >= 0 && e.KeyChar == '.') && e.KeyChar != (char)13 && e.KeyChar != (char)8)

            {

                e.Handled = true;

            }





        }

NealXX 2009-08-04

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 private void NumberAccpter(object sender, KeyPressEventArgs e)

        {

            int keyValue = (int)e.KeyChar;

            if ((keyValue >= 48 && keyValue <= 57) || keyValue == 8 || keyValue == 46)

            {

                if (sender != null && sender is TextBox && keyValue == 46)

                {

                    if (((TextBox)sender).Text.IndexOf(".") >= 0)

                        e.Handled = true;

                    else

                        e.Handled = false;

                }

                else

                    e.Handled = false;

            }

            else

                e.Handled = true;

        }