创建文本框的方法仅适用数字 [英] a methods that create textboxs apply only digit

问题描述

您好，所有亲
我想要一种仅将数字文本框创建调用方文本框的方法
那是什么?????????
请帮帮我吗?
像:
我在表单加载中遇到了这个问题，它只将textbox4用作数字
textbox4.applyonlydigits();

hello all pro
i want a methods that create caller textbox a only numeric textbox
what is that?????????
help me please??
like :
i have this in my form load and it takes textbox4 a only numeric one
textbox4.applyonlydigits();

推荐答案

请尝试以下代码

Hi Try this below code

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
                //You may make it 4 or 5 depends on your application
                if (textBox1.Text.IndexOf(' ') == textBox1.Text.Length - 2)
                    e.Handled = true;
        }

这是纯数字文本框的代码

This is the code for a numeric only textbox

private void textBox4_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsControl(e.KeyChar)
        && !char.IsDigit(e.KeyChar)
        && e.KeyChar != '.')
    {
        e.Handled = true;
    }

    // only allow one decimal point
    if (e.KeyChar == '.'
        && (sender as TextBox).Text.IndexOf('.') > -1)
    {
        e.Handled = true;
    }
}

但是最好通过添加一个类并继承文本框来创建自定义控件
并覆盖其OnKeyPress事件

But better create a custom control by adding a class and inherit textbox
and override its OnKeyPress Event

using System.Windows.Forms;

namespace Test
{
    public partial class NumericTextBox : TextBox
    {
        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            base.OnKeyPress(e);
            if (!char.IsControl(e.KeyChar)
                && !char.IsDigit(e.KeyChar)
                && e.KeyChar != '.')
            {
                e.Handled = true;
            }

            // only allow one decimal point
            if (e.KeyChar == '.'
                && (this as TextBox).Text.IndexOf('.') > -1)
            {
                e.Handled = true;
            }
        }
    }
}

您将在工具箱上获得一个新控件

you will get a new control on your toolbox

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