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winform 自定义数值(数字)输入框
最近写winform程序，发现自带的TextBox没发设置输入类型，这就有点痛苦了，查找了网上，没看到比较符合需求的；于是花了点时间，自己自定义了一个简单的数值输入框，实现的方式很简单，继承系统 的TextBox，重写OnTextChanged方法限制输入即可，代码如下：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace Widgets { ////// 数值输入框 /// public class NumberTextBox : TextBox { /// /// 输入数值类型 /// private NumberType numberType; /// /// 输入小数点，默认2位 /// private int decimalPointNumber; /// /// 允许输入的最小值，空值即代表当前类型的最小值 /// private string minValue; /// /// 允许输入的最大值，空值即代表当前类型的最大值 /// private string maxValue; [Browsable(true)] [Category("NumberTextBox"), Description("指定控件数值输入的最小值"), DisplayName("最小值")] public string MinValue { get { return minValue; } set { if (string.IsNullOrWhiteSpace(value)) { minValue = ""; } else if (numberType == NumberType.Integer) { if (int.TryParse(value, out int result)) { minValue = result.ToString(); } else { minValue = ""; } } else if (numberType == NumberType.Long) { if (long.TryParse(value, out long result)) { minValue = result.ToString(); } else { minValue = ""; } } else if (numberType == NumberType.Float) { if (float.TryParse(value, out float result)) { minValue = result.ToString("F" + decimalPointNumber); } else { minValue = ""; } } else if (numberType == NumberType.Double) { if (double.TryParse(value, out double result)) { minValue = result.ToString("F" + decimalPointNumber); } else { minValue = ""; } } } } [Browsable(true)] [Category("NumberTextBox"), Description("指定控件数值输入的最大值"), DisplayName("最大值")] public string MaxValue { get { return maxValue; } set { if (string.IsNullOrWhiteSpace(value)) { maxValue = ""; } else if (numberType == NumberType.Integer) { if (int.TryParse(value, out int result)) { maxValue = result.ToString(); } else { maxValue = ""; } } else if (numberType == NumberType.Long) { if (long.TryParse(value, out long result)) { maxValue = result.ToString(); } else { maxValue = ""; } } else if (numberType == NumberType.Float) { if (float.TryParse(value, out float result)) { maxValue = result.ToString("F" + decimalPointNumber); } else { maxValue = ""; } } else if (numberType == NumberType.Double) { if (double.TryParse(value, out double result)) { maxValue = result.ToString("F" + decimalPointNumber); } else { maxValue = ""; } } } } [Browsable(true)] [Category("NumberTextBox"), Description("指定控件数值输入类型"), DisplayName("数值类型")] public NumberType NumberType { get => numberType; set => numberType = value; } [Browsable(true)] [Category("NumberTextBox"), Description("当指定输入数值类型为小数时保留小数点位数"), DisplayName("小数点位数")] [DefaultValue(2)] public int DecimalPointNumber { get => decimalPointNumber; set => decimalPointNumber = value; } protected override void OnTextChanged(EventArgs e) { base.OnTextChanged(e); if (string.IsNullOrWhiteSpace(Text) || Text == "-")//输入负值 { return; } switch (numberType) { case NumberType.Integer: if (!int.TryParse(Text, out var i)) { Text = Text.Substring(0, Text.Length - 1); SelectionStart = Text.Length; } break; case NumberType.Long: if (!long.TryParse(Text, out var l)) { Text = Text.Substring(0, Text.Length - 1); SelectionStart = Text.Length; } break; case NumberType.Float: if (!float.TryParse(Text, out var f)) { Text = Text.Substring(0, Text.Length - 1); SelectionStart = Text.Length; } break; case NumberType.Double: if (!double.TryParse(Text, out var d)) { Text = Text.Substring(0, Text.Length - 1); SelectionStart = Text.Length; } break; } } protected override void OnKeyDown(KeyEventArgs e) { base.OnKeyDown(e); if (e.KeyCode == Keys.Enter) { VerifyThenFormatValue(); } } protected override void OnLostFocus(EventArgs e) { base.OnLostFocus(e); VerifyThenFormatValue(); } private void VerifyThenFormatValue() { if (string.IsNullOrWhiteSpace(Text)) { return; } if (numberType == NumberType.Float) { Text = float.Parse(Text).ToString("F" + decimalPointNumber).ToString(); } else if (numberType == NumberType.Double) { Text = double.Parse(Text).ToString("F" + decimalPointNumber).ToString(); } if (!string.IsNullOrWhiteSpace(minValue)) { if (numberType == NumberType.Integer) { if (int.Parse(Text) < int.Parse(minValue)) { Text = minValue; } } else if (numberType == NumberType.Long) { if (long.Parse(Text) < long.Parse(minValue)) { Text = MinValue; } } else if (numberType == NumberType.Float) { if (float.Parse(Text) < float.Parse(minValue)) { Text = minValue; } } else if (numberType == NumberType.Double) { if (double.Parse(Text) < double.Parse(minValue)) { Text = minValue; } } } if (!string.IsNullOrWhiteSpace(maxValue)) { if (numberType == NumberType.Integer) { if (int.Parse(Text) > int.Parse(maxValue)) { Text = maxValue; } } else if (numberType == NumberType.Long) { if (long.Parse(Text) > long.Parse(maxValue)) { Text = maxValue; } } else if (numberType == NumberType.Float) { if (float.Parse(Text) > float.Parse(maxValue)) { Text = maxValue; } } else if (numberType == NumberType.Double) { if (double.Parse(Text) > double.Parse(maxValue)) { Text = maxValue; } } } SelectionStart = Text.Length; } /// /// 复写Text，确保值是符合我们预设的类型 /// public override string Text { get => base.Text; set { if (string.IsNullOrWhiteSpace(value)) { base.Text = value; } else { if (numberType == NumberType.Integer) { if (int.TryParse(value,out var result)) { base.Text = result.ToString(); } else { base.Text = ""; } } if (numberType == NumberType.Long) { if (long.TryParse(value, out var result)) { base.Text = result.ToString(); } else { base.Text = ""; } } else if (numberType == NumberType.Float) { if (float.TryParse(value, out var result)) { base.Text = result.ToString("F"+decimalPointNumber); } else { base.Text = ""; } } else if (numberType == NumberType.Double) { if (double.TryParse(value, out var result)) { base.Text = result.ToString("F" + decimalPointNumber); } else { base.Text = ""; } } } } } [Browsable(false)] [DefaultValue(0)] public int IntValue { get { if (string.IsNullOrWhiteSpace(Text) || numberType != NumberType.Integer) { return 0; } VerifyThenFormatValue(); return int.Parse(Text); } set { Text = value.ToString(); VerifyThenFormatValue(); } } [Browsable(false)] [DefaultValue(0)] public long LongValue { get { if (string.IsNullOrWhiteSpace(Text) || numberType != NumberType.Long) { return 0; } VerifyThenFormatValue(); return long.Parse(Text); } set { Text = value.ToString(); VerifyThenFormatValue(); } } [Browsable(false)] [DefaultValue(0)] public float FloatValue { get { if (string.IsNullOrWhiteSpace(Text) || numberType != NumberType.Float) { return 0; } VerifyThenFormatValue(); return float.Parse(Text); } set { Text = value.ToString(); VerifyThenFormatValue(); } } [Browsable(false)] [DefaultValue(0)] public double DoubleValue { get { if (string.IsNullOrWhiteSpace(Text) || numberType != NumberType.Double) { return 0; } VerifyThenFormatValue(); return double.Parse(Text); } set { Text = value.ToString(); VerifyThenFormatValue(); } } } public enum NumberType { Integer, Long, Float, Double } } - 1
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该输入框可实现不同类型数值输入，包括整数，小数（可设置保留位数），还可以限制输入的最大最小值
使用方式：
- 拷贝代码到工程中，编译项目
- 打开工具箱，找到NumberTextBox拖到界面中即可
- 点击控件，可在属性栏中设置输入类型，最大最小值等相关属性
- 根据自己定义的输入类型调用IntValue等方法获取值即可
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- 原文地址：https://blog.csdn.net/ngl272/article/details/126430750
