C# TextBox控件重写 之NumTextBox

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：
String跟普通TextBox功能一样
Numeric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：NumTextBox.rar

柳永法(yongfa365)'Blog转载，修改自：http://www.codeproject.com/KB/edit/numedit.aspx

引用：
[.net自定义控件]TextBox控件重写 之NumTextBox
http://www.yongfa365.com/item/NumTextBox.html

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------本文转载自：http://www.yongfa365.com/Item/NumTextBox.html