TextBox控件重写 之NumTextBox，主要实现的功能是，只允许输入数字，或String,Numeric,Currency,Decimal,Float,Double,Short,Int,Long
等加了一个属性InputType可以设置其，还可以自己进一步扩展，因为是开源的。
public enum NumTextBoxType
{
String,//是这个的时候，什么都不处理，跟正常TextBox一样
Numeric,//只要是数字就行
Currency,
Decimal,
Float,
Double,
Short,
Int,
Long
}
主要代码：
using System; using System.Windows.Forms; using System.ComponentModel; using System.Text.RegularExpressions; namespace YongFa365.Controls.NumTextBox { public class NumTextBox : TextBox { private NumTextBoxType inputType ＝ NumTextBoxType.Numeric; public enum NumTextBoxType { String,//是这个的时候，什么都不处理，跟正常TextBox一样 Numeric,//只要是数字就行 Currency, Decimal, Float, Double, Short, Int, Long } public NumTextBox() { this.ContextMenu = new ContextMenu(); } [ Category("专用设置"), DefaultValue(NumTextBoxType.Numeric), Description("设置允许类型：\nString跟普通TextBox功能一样\nNumeric只要是数字就可以") ] public NumTextBoxType InputType { get { return inputType; } set { inputType = value; } } public override string Text { get { return base.Text; } set { if (IsValid(value, true)) { base.Text = value; } } } private bool IsValid(string val, bool use) { bool ret = true; if (string.IsNullOrEmpty(val)) { return ret; } if (use) { if (val.Equals("-") && inputType != NumTextBoxType.Numeric) { return ret; } } try { switch (inputType) { case NumTextBoxType.String: break; case NumTextBoxType.Numeric: if (!Regex.IsMatch(val, @"^\d*$")) { ret = false; } break; case NumTextBoxType.Currency: decimal dec = decimal.Parse(val); int pos = val.IndexOf("."); if (pos != -1) { ret = val.Substring(pos).Length <= 3; } break; case NumTextBoxType.Float: float flt = float.Parse(val); break; case NumTextBoxType.Double: double dbl = double.Parse(val); break; case NumTextBoxType.Decimal: decimal dec2 = decimal.Parse(val); break; case NumTextBoxType.Short: short s = short.Parse(val); break; case NumTextBoxType.Int: int i = int.Parse(val); break; case NumTextBoxType.Long: long l = long.Parse(val); break; default: throw new ApplicationException(); } } catch { ret = false; } return ret; } protected override bool ProcessCmdKey(ref Message msg, Keys keyData) { if (keyData == (Keys)Shortcut.CtrlV || keyData == (Keys)Shortcut.ShiftIns) { IDataObject iData = Clipboard.GetDataObject(); string newText; newText = base.Text.Substring(0, base.SelectionStart) + (string)iData.GetData(DataFormats.Text) + base.Text.Substring(base.SelectionStart + base.SelectionLength); if (!IsValid(newText, true)) { return true; } } return base.ProcessCmdKey(ref msg, keyData); } protected override void OnLeave(EventArgs e) { if (!(inputType == NumTextBoxType.Numeric || inputType == NumTextBoxType.String)) { if (base.Text != "") { if (!IsValid(base.Text, false)) { base.Text = ""; } else if (Double.Parse(base.Text) == 0) { base.Text = "0"; } } } base.OnLeave(e); } protected override void OnKeyPress(KeyPressEventArgs e) { if (inputType != NumTextBoxType.String) { char c = e.KeyChar; if (!Char.IsControl(c)) { if (c.ToString() == " ") { e.Handled = true; return; } string newText = base.Text.Substring(0, base.SelectionStart) + c.ToString() + base.Text.Substring(base.SelectionStart + base.SelectionLength); if (!IsValid(newText, true)) { e.Handled = true; } } } base.OnKeyPress(e); } } }
演示及组件下载地址：
转载，修改自：
引用：
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